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Motor Protective Relay
SE
CSM_SE_DS_E_8_2
Solid-state Relay Provides Three Operating
Functions in a Compact Package
• Prevents burnouts in 3-phase induction motors due to overcurrent,
open-phase, or reverse-phase.
• LEDs indicate operation of the selected operating function.
• Wide setting ranges: current: 1 to 160 A; operating time: 1 to 40 s.
• Protects the motor from reversing without starting it.
The SE cannot be used with circuits with
distorted waveforms, inverter circuits, or
capacitor loads.
Model Number Structure
■ Model Number Legend
SE-K@@@@@N
1
2 3 4 5 6 7 8
5. Control voltage
1:
100/110/120 VAC
2:
200/220/240 VAC
4:
380/400/440 VAC
6. Reset method
None: Manual reset
A:
Automatic reset
7. Operating value
None: 115% of the current SV
E:
100% of the current SV
8. Product history
N:
New version
1. Basic model name
SE: Motor Protective Relay
2. Protective functions
K:
Three possible operating functions: overcurrent, openphase, or reverse-phase protection
3. Operating time characteristics for overload element
Q:
Instantaneous type: Fixed time at starting and instantaneous during operation
None: Inverse type: Inverse operation both at starting and during
operation
4. Case
P:
Plug-in type
None: Flush mount type
Note: A 3-phase transformer (sold separately) must be used to operate Plug-in Relays at 380, 400, 415, or 440 VAC. Drop the primary voltage
(380 to 440 VAC) to a 200-VAC secondary voltage before applying it to the SE-KP2EN or SE-KQP2EN.
Ordering Information
[email protected]
Overcurrent operating value: 100% of the current SV.
Terminal/mounting
Control voltage
Reset
Model
Inverse type
Plug-in terminal/DIN 100/110/120 VAC
rail via socket
200/220/240 VAC
Manual
Instantaneous type
(See note.)
SE-KP1EN
SE-KQP1EN
SE-KP2EN
SE-KQP2EN
Screw terminal/flush 100/110/120 VAC
mount
200/220/240 VAC
SE-K1EN
SE-KQ1EN
SE-K2EN
SE-KQ2EN
380/400/440 VAC
SE-K4EN
SE-KQ4EN
Note: With start-up lock: fixed time-limit on start-up, instantaneous thereafter.
Plug-in type requires a socket (8PFA1) which is sold separately.
Refer to page 9 for the mounting conditions.
1
SE
SE-@@N
Overcurrent operating value: 115% of current SV.
Control voltage
Reset
Model
Inverse type
100/110 120 VAC
200/220/240 VAC
100/110/120 VAC
200/220/240 VAC
380/400/440 VAC
Instantaneous type (See note 1.)
Manual
SE-KP1N
SE-KQP1N
Automatic
SE-KP1AN
SE-KQP1AN
Manual
SE-KP2N
SE-KQP2N
Automatic
SE-KP2AN
SE-KQP2AN
Manual
SE-K1N
SE-KQ1N
Automatic
SE-K1AN
SE-KQ1AN
Manual
SE-K2N
SE-KQ2N
Automatic
SE-K2AN
SE-KQ2AN
Manual
SE-K4N
SE-KQ4N
Automatic
---
---
Note: 1. With start-up lock: fixed time-limit on start-up, instantaneous thereafter.
2. The operating value for the overload detection function of the SE-@@N is 115% of the current SV.
■ Accessories (Order Separately)
Current Converters
Model
3-phase Transformer
Specify the primary voltage when ordering.
Only one SE relay can be connected.
Current range
SET-3A
1 to 80 A
SET-3B
64 to 160 A
Model
DIN rail socket
SE-PT400
Voltage specification
Primary side
8PFA1
380 to 480 V
(wide power
supply range)
Secondary power
consumption
7 VA
Secondary side 190 to 240 V
(wide power
supply range)
Adapter
Model
SE-F7AD
This Adapter is used to replace existing flush mount models with new
models.
Specifications
■ Ratings
Motor circuit
Voltage: 500 VAC max. 3-phase (primary voltage at SET current converter)
Current: 1 to 80 A or 64 to 160 A 3-phase (primary current at SET current converter)
Power supply circuit
Voltage: 100/110/120 VAC, 200/220/240 VAC, or 380/400/440 VAC 3-phase
(treat as a single phase voltage when the reverse-phase function is not needed)
Voltage fluctuation: +10/−15% max. of the rated voltage (+10/−50% max. for open-phase function)
Frequency: 50/60 Hz ±5%
Current SV range
See table of Current Converter.
Output relay contact
Configuration: SPDT
Capacity:
Refer to the table below.
Power consumption
100/110/120 VAC: approx. 3.5 VA; 200/220/240 VAC: approx. 7 VA; 380/400/440 VAC: approx. 11 VA
Case color
Plug-in model: Munsell 5Y7/1
Panel-mount model: Munsell N1.5
Output Contact Capacity
Control power supply
Contact
Manual reset
Automatic reset
100/110/120 VAC or
200/220/240 VAC
NO
3 A (cosφ = 1.0)/1.5 A (cosφ = 0.3 to 0.4) at 240 VAC 3 A (cosφ = 1.0)/2 A (cosφ = 0.4) at 240 VAC
NC
3 A (cosφ = 1.0)/2 A (cosφ = 0.3 to 0.4) at 240 VAC
380/400/440 VAC
NO
3 A (cosφ = 1.0)/1.5 A (cosφ = 0.3 to 0.4) at 440 VAC ---
NC
3 A (cosφ = 1.0)/2 A (cosφ = 0.3 to 0.4) at 440 VAC
2
SE
■ Characteristics
Item
Overcurrent
Inverse type
Instantaneous type
Operating value
100% of the current SV (SE-@@EN)
115% of the current SV (SE-@@@N)
Operating time
characteristics
Inverse time both at starting and during operation
Fixed time at start-up and instantaneous during
operation
Operating time
For an overcurrent of 600%:
Time scale × 1: 1 to 10 s
Time scale × 4: 4 to 40 s
For an overcurrent of 200%:
2.8 × t, where t is the time at 600%
overcurrent. (time SV at max.: 10 s or 40 s)
In fixed time mode (start-up mode) with an
overcurrent of 600%:
Time scale × 1: 1 to 10 s
Time scale × 4: 4 to 40 s
In instantaneous mode:
0.5 s max. at 140% overcurrent
Initial current in
start-up mode
---
Operates when the current is about 30% of the set
current
Inertial
characteristics
At the min. current SV and max. time SV, will not
operate for 80% of the operating time for a 600%
overcurrent.
---
Open-phase
Operating value:
Less than 50% of the current SV (at open-phase)
Operating unbalance: At high sensitivity (H): 35 ±10%; At low sensitivity (L): 65 ±10%
(The unbalance for a max. 3-phase current equal to the current SV)
Operating time:
At high sensitivity (H): 2 s max.; At low sensitivity (L): 3 ±1 s
(Open-phase current equal to the current SV)
Reverse-phase
Operating value: 80% max. of the rated voltage
Operating time: 0.5 s max. at the rated voltage
Overcurrent SV accuracy
Operating value: ±10% of max. current SV
Operating time: +10/−5% of max. time SV (at a time SV: 1), +10% of max. time SV (at a time SV: 2 to 10)
(start-up lock)
Influence of temperature
(overcurrent)
Operating value: ±5% for 0 to 40°C; ±10% for -10 to 50°C
Operating time: ±10% for 0 to 40°C; ±20% for -10 to 50°C (start-up lock)
Influence of frequency
(overcurrent)
Operating value: ±3% for a frequency fluctuation of ±5%
Operating time: ±5% for a frequency fluctuation of ±5% (start-up lock)
Influence of voltage
(overcurrent)
Operating value: ±3% for a voltage fluctuation of +10/-15%
Operating time: ±5% for a voltage fluctuation of +10/-15% (start-up lock)
Insulation resistance
10 MΩ min. between the entire electric circuits and the mounting panel
5 MΩ min. between contact circuits, or between contacts of same pole
Withstand voltage
Refer to the table below.
Lighting impulse withstand voltage
6000 V max. between the entire circuits and the mounting panel
4500 V max. between contact circuits, or across contacts
Waveform: 1.2/50 μs
Overload capacity
Motor circuit:
20 times the current SV for 2 s, applied twice with a 1 min interval
Control voltage: 1.15 times the rated control voltage for 3 hrs
Life Expectancy
10,000 operations min. (non-conducting contacts)
Vibration resistance
Malfunction: 10 to 55 Hz, 0.3-mm double amplitude each in 3 directions for 10 minutes
Destruction: 10 to 25 Hz, 2-mm double amplitude each in 3 directions for 2 hours
Shock resistance
Malfunction: 98 m/s2 (approx. 10G) each in 3 directions
Destruction: 294 m/s2 (approx. 30G) each in 3 directions
Test button operation
Operated quickly (without lighting the LED)
Ambient temperature
Operating: –10 to 60°C (with no icing)
Storage:
–25 to 65°C (with no icing)
Ambient humidity
Operating: 35% to 85%
Altitude
2,000 m max.
Weight
Approx. 170 to 230 g
Dielectric Strength
Test Area
Control voltage
100/110/120 VAC
Between electric circuits and the mounting panel 2,000 VAC for 1 min
200/220/240 VAC
380/400/440 VAC
2,500 VAC for 1 min
Between contact circuits and other circuits
2,000 VAC for 1 min
2,500 VAC for 1 min
Between each pair of contacts
1,000 VAC for 1 min
1,000 VAC for 1 min
3
SE
Engineering Data
■ Operating Characteristics
320
70
Operating time (s)
Time Changeover Switch: ×4
80
Time scale value
10
8
6
4
2
1
60
50
40
280
Operating time (s)
Overcurrent Operating Time Characteristics
(Instantaneous Type - Start-up Lock)
Time Changeover Switch: ×1
Time scale value
10
8
6
4
2
1
240
200
160
0.8
0.7
0.6
0.5
0.4
30
120
0.3
20
80
0.2
10
40
0.1
100
200
300
400
500
0
600
100
200
300
Open-phase Operating Characteristics
100
90
80
Low sensitivity (L)
70
60
50
High sensitivity (H)
40
400
500
0
600
100
200
300
400
500
600
Current (% of current SV)
Current (% of current SV)
Current (% of current SV)
Open-phase Operating Time Characteristics
Operating time (s)
0
Unbalanced factor (%)
Operating time (s)
Overcurrent Operating Time Characteristics
(Inverse Type)
5
4
Low sensitivity (L)
3
2
High sensitivity (H)
30
1
20
10
0
100
200
300
400
500
600
Current (% of current SV)
0
100
200
300
400
500
600
Current (% of current SV)
4
SE
Operation
■ Settings
Motor Relay Switch Settings
Current Scale Multiplying Factor Decal
Determine the current scale multiplying factor corresponding to the
current SV range obtained from Table 1 and paste the current scale
multiplying decal to the motor protective relay. For example, when
the current setting range is 8 to 20 A, the decal no. is 2.
LED Indicators
The LEDs indicate which function is in operation.
OPEN refers to open-phase, OC refers to
overcurrent, and RVS refers to reverse-phase.
Manual Reset
The reset button will pop out about 4 mm when the
relay has been tripped. After the relay has
operated, reset by pressing this button. Disconnect
the power supply before resetting for
reverse-phase operation.
Function Setting DIP SW
The three ON/OFF switches enable or disable the
three functions. The functions can be enabled in any
combination. With the open-phase function, the H/L
switch sets the current unbalance factor. When set to
H", the motor circuit operates at 35% of the current
unbalance factor for operation. When set to L", the
motor circuit operates at 65% min. of the current
unbalance factor for operation.With the over-current
function, the x4/x1 switch sets the time changeover
value for the start-up mode. When set to x4", the
operating time range is 4 to 40 s. When set to x1",
the operating time range is 1 to 10 s.
OPEN OC RVS
TRIP/RESET
CURRENT
6 7 8
9
5
4
10
FUNCTION
RVS ON
OPEN ON
H
ON
×1
sec
OFF ×
OFF
L
OFF
×1
sec
3
TEST 2
Setting Operating Current
Set the current-setting knob to the required
current value. The setting value is indicated by
the product of the scale value and the multiplying
factor as shown in the following table. The
required trip current can be obtained directly by
means of the current knob.
2
TIME
4 5 6 7
1
SE-KP2N
Decal
No.
0.25
0.5
1
2
4
8
16
A
8
9
10
sec
MOTOR RELAY
4
1
2
4
8
16
32
64
Current scale value (A)
5
6
7
8
9
1.25 1.5 1.75 2
2.25
2.5
3
3.5
4
4.5
5
6
7
8
9
10
12
14
16
18
20
24
28
32
36
40
48
56
64
72
80
96
112
128 144
10
2.5
5
10
20
40
80
160
Setting Operating Time
Set the time setting knob to the required time. The operating time
is equal to the time scale value times the setting on the time
changeover switch. For example, if the time scale value is 6 and
the time changeover switch is set to 4, the operating time is 24 s.
Test Button
Pushing the test button momentarily operates the trip display and
the output relay.
The operation indicators will not light for the test button. It doesn't
matter whether the function setting switch is ON or OFF.
Current Converter Settings
Determining the Number of
Primary Conductor Runs
Determine the number of passes and the tap setting
from the table above. For example, if the current
setting range is 8 to 20 A, there is one pass and the
tap setting is 20.
Pass the wires through the holes from the same
direction. It doesn’t matter which wires go through
which holes.
SET-3A
SURRENT
CONVERTER
No.
25053
DATE
1983
OMRON Corporation
20
40
80
MADE IN JAPAN
Tap Setting
In tap setting, insert the setting screw into
the required tap hole with a screwdriver.
After setting, be sure to replace the cover.
One conductor pass
(The conductors pass
through the holes once.)
Four conductor passes
(The conductors pass
through the holes four times.)
5
SE
Selecting the Current Converter
The current requirements of the motor determine the current range of the Motor Protective Relay, and whether the SET-3A or SET-3B Current
Converter should be used, as shown in the following table.
Motor specifications
kW
HP
Motor Protective Relay
A
0.2
0.25
1.4
0.4
0.5
2.3
0.75
1
Current range
3.8
Note 1
Current Converter
Decal No.
Passes
Tap settings
1 to 2.5
0.25
8
20
2 to 5
0.5
4
20
2
20
Model
5
1.5
2
6.8
4 to 10
1
2.2
3
9.5
8 to 20
2
20
3.7
5
15
5.5
7.5
22
16 to 40
4
40
7.5
10
30
32 to 80
8
64 to 160
16
11
15
43
15
20
57
72
19
25
22
30
82
30
40
111
37
50
135
1
SET-3A
80
Fixed
SET-3B
Note: 1. Connect to the secondary of a commercial current transformer for motors exceeding 37 kW.
2. Connect a commercial current transformer when using high-voltage motors or low-voltage high-capacity motors.
Installation
■ Internal Circuit
Inverse Type
To all circuits
Motor
X
Output
relay
Test
OPEN
OC: overcurrent LED
OPEN: open-phase LED
RVS: reverse-phase LED
RVS
Power supply
circuit
RY drive circuit
OR circuit
AND circuit
OC
5
6
(C+)
Reverse-phase
detecting circuit
M
Open-phase
detecting circuit
8
(C−)
Current SV
circuit
Tap setting
circuit
Rectifying
circuit
−
7
Overcurrent
detecting circuit
(Ta)
(C+)
+
(Tc)
7
Control
voltage
(U)
(V)
(W)
1
2
3
8
(C−)
Start-up mode
time SV circuit
X/C
SET-3
Current Converter
4
AND circuit
(Tb)
Start-up detecting circuit
T
Open-phase
Overcurrent
detecting circuit detecting circuit
S
Current SV
circuit
R
Instantaneous Type
(Start-up Lock)
SE Motor Protective Relay
3-phase 50/60 Hz
OC
OPEN
Note: 1. The numbers in circles are the terminal numbers for Plug-in Models. The letters in parentheses are the terminal markings on Panelmounting Models.
2. You cannot use reverse-phase protection if you use control power with single-phase operation. Connect to terminals 1 and 2 for singlephase operation. Also, make sure to turn OFF the reverse-phase setting on the function setting switches. An error will occur if the SE is
used with the reverse-phase setting turned ON during single-phase operation. Reverse-phase is detected in order of phase1, phase2
and phase3 of control power.
3. The AND circuit in the internal circuits contains a time setting circuit.
6
SE
■ Connections
External Connections
Manual Operation Low-voltage Circuit
R
S
Automatic Operation Low-voltage Circuit
R
T
S
T
Stop
Start
BZ
BZ
Alarm
buzzer
Electromagnetic
contactor
Automatic
contact
Electromagnetic
contactor
6
5
4
6
3
7
8
1
2
+
SET-3
Current
Converter
Motor
S
1
8
2
+
−
M
High-tension Motor No-voltage Tripping Circuit
-Y)
R
7
Motor
M
Manual Operation Low-voltage Circuit
Δ Start)
3
(C+) (C−) (U) (V)
Phase
advancing
capacitor
SET-3
Current
Converter
−
4
SE series
Motor Protective Relay
SE series
Motor
Protective
Relay
(C+) (C−) (U) (V)
5
(Ta) (Tc) (Tb) (W)
(Ta) (Tc) (Tb) (W)
Phase
advancing
capacitor
Alarm
buzzer
R
T
S
T
Potential
transformer
110 V
110 V
BZ
Alarm
buzzer
Stop
BZ
Start
Alarm
buzzer
No-voltage
tripping coil
Oil circuit
breaker
Magnet
contactor
6
6
SE series
Motor Protective
Relay
Phase
advancing
capacitor
5
4
3
(Ta) (Tc) (Tb) (W)
(C+) (C−) (U) (V)
+
SET-3
Current
Converter
7
8
1
[email protected]@N Motor
Protective Relay
2
Phase
advancing
capacitor
5
4
3
(Ta) (Tc) (Tb) (W)
(C+) (C−) (U) (V)
7
Current
transformer
8
1
2
−
+
changeover
M
High-tension
motor
Motor
−
M
SET-3
Current
Converter
Note: 1. When using the SE as a 2E (overload and open-phase) relay, it is not necessary to connect terminal 3 (W).
Also, always turn OFF the reverse-phase elements.
2. When using a model with an automatic reset, the Motor Protective Relay may not operate if there is an open
phase on the power supply side of the motor circuit.
3. Supply control power to the Motor Protective Relay from the power supply side of the contactor. The Motor
Protective Relay may not operate at the set time if the power supply of the Motor Protective Relay is turned
ON at the same time that the motor starts.
7
SE
Manual Operation Low-voltage Circuit
(When using a [email protected]@N in a 400/440 VAC Circuit)
R
S
T
Automatic Operation Low-voltage Circuit
(High-capacity Motor)
100 or 200 VAC
SE-PT400
U
u
V
v
W
w
R
S
T
Magnet
contactor
Stop
Alarm
buzzer
BZ
Start
Alarm
buzzer
BZ
Automatic
contact
6
5
4
3
(Ta) (Tc) (Tb) (W)
SE series
Motor Protective
Relay
Magnet
contactor
6
5
4
Phase
advancing
capacitor
3
(C+) (C−) (U) (V)
7
8
1
2
Current
transformer
[email protected]@N Motor
Protective Relay
+
Phase
advancing
capacitor
7
SET-3
Current
Converter
8
1
2
−
Motor
+
M
SET-3A
Current
Converter
−
Motor
M
Automatic Operation
Manual Operation Low-voltage Circuit
(Using the Overcurrent and Open-phase Functions)
R
R
S
S
T
T
Control power supply
Stop
Stop
Start
BZ
BZ
Start
Alarm
buzzer
Alarm
buzzer
Magnet
contactor
Magnet
contactor
6
6
5
4
3
(Ta) (Tc) (Tb) (W)
(C+) (C−) (U) (V)
7
+
SET-3
Current
Converter
Motor
−
M
8
1
2
4
3
SE series
Motor Protective
Relay
SE series Motor Protective
Relay
Phase
advancing
capacitor
5
(Ta) (Tc) (Tb) (W)
(C+) (C−) (U) (V)
Phase
advancing
capacitor
7
8
1
2
SET-3
Current
Converter
Motor
M
Note: 1. When using the SE as a 2E (overload and open-phase) relay, it is not necessary to connect terminal 3 (W).
Also, always turn OFF the reverse-phase elements.
2. When using a model with an automatic reset, the Motor Protective Relay may not operate if there is open
phase on the power supply side of the motor circuit
3. Supply control power to the Motor Protective Relay from the power supply side of the contactor. The Motor
Protective Relay may not operate at the set time if the power supply of the Motor Protective Relay is turned
ON at the same time that the motor starts.
8
SE
Dimensions
Note: All units are in millimeters unless otherwise indicated.
Plug-in Socket Terminal
[email protected], [email protected]
7
6
The Height of DIN Rail
Mounting
8
5
9
4
10
3
4 5 6
96
91
8
9
10
2
1
48
Flush Mount Type
[email protected], [email protected]
6
SE
(111)
7
7
5
12
78.5
8PFA1 (order separately)
44
9.5
100
Panel Cutout
8
9
4
10
96
3
2
1
4 5 6
73
92 +0.8
0
50
91
7
8
9
10
45 +0.8
0
12
48
78.5
Current Converter
SET-3A, SET-3B
26
9 9 9
44
14
104.5
Two, M3.5
terminal screws
M3.5 screw
terminals
Three, 20-dia. through holes
Mounting Holes
Four, 6-dia. mounting holes or
four, M5 mounting screw holes
33.5
112
80
80±0.5
33.5
6
20.5
40
52
28
60
73
Transformer SE-PT400
(for Use with the SE-K(Q)P2EN)
Optional Adapter
SE-F7AD
116.5
45
Two, 6.5-dia.
Four, R7
holes
4-4.5×7
101.0
60
52±0.5
4
25
132 114 92
M3.5 screw
72.0 max.
45
90
52
Note: The SE-PT400 can be used for all
200/220/240-VAC SE Relays.
Primary voltage: 380 to 480 VAC
Secondary voltage: 190 to 240 VAC
Note: This Adapter is used to replace existing flush
mount models with new models.
Plate material: Steel plate (thickness: 2.0 mm)
Color: Black (Munsell N1.5)
9
SE
■ Testing Method
With the circuit shown below, the characteristics listed in the following table can be tested. Determine the number of conductor runs through the
holes of the current transformer in accordance with the operating current range of the Motor Protective Relay and by referring to the table in the
section Selecting the Current Converter.
3-phase, 200 V, 50/60 Hz
R
S
T
SW1
100 VAC
50/60 Hz
Y
1
2
CC
3
5
7
6
100 V
C
SW2
±
8
R1
R1
SET
Current
Converter
SE-KP2EN
Motor Protective Relay
R2
3φSD:
A:
V:
CC:
Y:
3-phase voltage regulator (5 to 15 A)
AC ammeter
AC voltmeter (300 V)
cycle counter
auxiliary relay (15 A)
Test item
variable resistor (50 Ω, 400 W + 400 W)
fixed resistor (50 Ω, 400 W + 400 W)
knife switch (three-phase)
toggle switch
Test procedure
Operating value
Overcurrent
R1:
R2:
SW1:
SW2:
1. Turn on SW1.
2. Turn on SW2 to operate auxiliary relay Y.
Operating time
1. Turn on SW1 and SW2 and increase the current to the Current Converter to 600% of the current SV by adjusting the
voltage regulator. Then turn off SW1 and SW2.
3. Gradually increase the current by adjusting the voltage
regulator. Read the positions at which the relay oper- 2. Turn on SW1.
ates.
3. Turn on SW2 and record the value of the cycle counter CC
4. Turn off SW1.
when it is stopped by the relay operation.
4. Turn off SW2.
Open-phase
1. Open (burn-out) any one of the Current Converter input 1. Open (burn-out) any one of the Current Converter input
phases. Adjust the voltage regulator so that the currents of
phases.
the other two phases equal the current SV.
2. Turn on SW1 and SW2. Gradually increase the current by
2. Turn on SW1 and SW2, and record the value of the cycle
adjusting the voltage regulator.
counter CC when it stops.
3. Confirm that the relay operates when the current is 50%
3. Turn off SW2.
or less of the current SV.
4. Turn off SW1.
Reverse-phase
1. Reverse the leads at terminals 2 and 3 of the relay (indi- 1. Create a reverse-phase condition at the voltage inputs.
cated by the dashed lines) to create a reverse-phase 2. Turn on SW and SW , and record the value of the cycle
1
2
condition.
counter CC when it stops.
2. Turn on SW1 and SW2 and confirm that the relay oper- 3. Turn off SW .
2
ates.
3. Connect the voltage regulator to terminals 1, 2, and 3.
4. Increase the voltage by adjusting the voltage regulator,
and confirm that the relay operates when the voltage is
below 80% or less of the rated voltage.
10
SE
■ Checking Operation
Checklist After Connection and Before Starting Motor
Check the Current Converter for the proper number of
conductor runs through holes and the proper direction.
Relay operates instantaneously
Test Operation
Corrective action
Apply control
power supply
to the relay
Change the phasesequence of 3-phase
voltage properly.
Check the Current Converter and Motor Protective Relay
for connection with proper polarity.
Press the test button (for
longer than the set time).
Check the phase-sequence of 3-phase voltage (for 3E
relays).
Does the relay
operate?
NO
Check for:
1. Loose terminal screw
2. Faulty reset of trip
indicator
3. Low voltage at power
supply
YES
NORMAL
Troubleshooting
Trouble
Check Points
Relay operates before the motor starting time has 1. Is there any open-phase trouble in the motor or its circuit (fuses, electromagnetic contacelapsed. (OPEN indicator)
tors, wiring)?
2. Does the Current Converter have the correct number of conductor runs through holes?
Does the conductor run in the proper direction?
3. Is the supply voltage or motor current unbalanced (unbalanced factor of more than 35%)?
Relay operates after the motor starting time has
elapsed. (OC indicator)
1. Does the set current match the motor current?
2. Does the set operating time match the motor starting time?
3. Does the Current Converter have the correct number of conductor runs through the holes?
Motor circuit is not tripped when the relay operates following the depression of the test button.
1. Disconnect terminals 4, 5, and 6, (Ta, Tb and Tc with the flush mount type) and check the
relay contacts for electrical continuity.
Relay doesn’t operate properly under light loads. 1. Check each phase for an unbalance of more than 35%, and also check for waveform distortion.
2. If the open-phase unbalance sensitivity switch is set to “H”, then switch it to “L”.
3. If the switch is already set to “L”, then the open-phase ON/OFF switch can be set to OFF,
but the open-phase function will be disabled.
■ Calculating the Unbalanced
Factor
The unbalanced factor can be obtained easily from the following
graph. In the graph, the horizontal axis indicates the phase of the
maximum current, whereas the two vertical axes indicate the remaining two phases. Taking the phase of the maximum current with a reference value of 1.0, the unbalanced factor is obtained in percentage
from the curves centered in the graph.
When the motor current IR = 100 A, Is = 60 A, and IT = 70 A, calculate
the ratios of the currents, setting the value of the maximum current to
1. In this case the ratios are 1 : 0.6 : 0.7 (IR : IS : IT).
To find the unbalanced factor, follow the arcs from the ratio values on
the vertical axes, in this case 0.6 and 0.7, to their intersection point.
The unbalanced factor can be estimated from the values on the
graph. Here the unbalanced factor is approx. 36%.
11
SE
Questions and Answers
Q
When using the SE as a 2E (overload and open-phase)
relay, can the control power supply voltage be supplied
separately from the motor circuit?
Normal three-phase condition Complete open-phase loss
Yes. Operation will be correct.
DC
average
Value
Q
What is the input volt-amp consumption of the SET-3@?
Unbalance
Input Volt-Amp Consumption of SET-3@ at Rated Current
SET-3A
SET-3B
Q
At 20 A for 20-A model
Approx. 0.1 VA/phase
At 40 A for 40-A model
Approx. 0.2 VA/phase
At 80 A for 80-A model
Approx. 0.4 VA/phase
At 160 A
Approx. 0.4 VA/phase
Why is the control power supply 100/110 V?
The main reason the SE uses a 100/110-V control power
supply is because 100/110 V is applicable to high-voltage
motor protection. With a high-voltage motor, the voltage is
first reduced with a potential transformer, and the secondary
side is connected to the SE. When using the SE as a 2E
(overload and open-phase) relay, a normal 100-V power
supply can be used without connecting to the secondary side
of a potential transformer.
For the overload factor, the DC average level is detected relative to
the set value. For the phase-failure factor, the proportion of the DC
average level and AC component is used to distinguish phase failure
or unbalance.
When the motor is operated using thyristor phase control, the motor
current waveform is not a sine wave. The SE detects this as an
adverse condition and initiates unnecessary operations. The
example below shows a primary current and SET-3@ output
waveform. When there is a large AC component in the output
voltage, the SE series sometimes judges it to be a phase-failure and
initiates unnecessary operations.
3.54 A
Current
76°
Q
Output voltage
How long of a power interruption is required to restart
the startup lock timer with an Instantaneous-type SE
Relay (with startup lock)?
Approx. 0.5 s min.
Q
5V
Why is it not possible to use the SE in a circuit
containing thyristor control or a rectifier?
A schematic diagram showing the operating principle for the
SE is shown below.
• Load current: 2.50 A (actual value)
• SET-3A output voltage: 21.00 VDC
10 ms • Phase control accuracy: 76°
0
3.54 A
Current
11°
SET-3@
(+)
(7)
20
40
Output voltage
80
SE
CT
5V
(−)
(8)
0
• Load current: 2.50 A (actual value)
• SET-3A output voltage: 21.77 VDC
• Phase control accuracy: 11°
10 ms
M
As shown in the above diagram, the waves for all three
phases of the motor current from the CT of the SET-3@ are
rectified, then converted to DC voltage, which is necessary
for the SE, by the resistor at each tap, and output from the
positive and negative terminals. The DC and AC component
ratios in this voltage differ between the normal three-phase
condition and conditions of phase-failure or unbalance.
12
SE
Q
What is the range of the operating time for inverse
operation?
What is the approximate DC output voltage of an SET-3@
Current Converter?
Q
Use the voltages in the following chart as a guide.
Use the values in the following table as guidelines.
Time scale: × 1
(s)
Percentage of current
setting
1
1.0 to 7.3
Time scale: × 4
(s)
Three-phase current Percentage of SET-3@ current setting tap value
Output voltage
40
100
200
400
Operating time
setting
Percentage of current
setting
200%
600%
0.5 to 2.0
1
3.9 to 29.1
2.0 to 8.0
2
1.9 to 10.9 1.0 to 3.0
2
7.8 to 43.7
4.0 to 12.0
3
3.9 to 14.6 2.0 to 4.0
3
15.7 to 58.3
8.0 to 16.0
4
5.9 to 18.2 3.0 to 5.0
4
23.5 to 72.8 12.0 to 20.0
5
7.8 to 21.9 4.0 to 6.0
5
31.3 to 87.4 16.0 to 24.0
6
9.8 to 25.5 5.0 to 7.0
6
39.2 to 102
20.0 to 28.0
7
11.7 to 29.1 6.0 to 8.0
7
47.0 to 117
24.0 to 32.0
8
13.7 to 32.8 7.0 to 9.0
8
54.9 to 131
28.0 to 36.0
SET-3A/3B Current Converter
Three-phase Input Current and Output
Voltage Characteristics
9
15.7 to 36.4 8.0 to 10.0
9
62.7 to 146
32.0 to 40.0
Reference
10
17.6 to 40.0 9.0 to 11.0
10
70.5 to 160
36.0 to 44.0
200%
600%
DC output voltage (VDC) 8.4
21
42
84
600
123
Note: 1. This is the output voltage when connected to an SE Motor Protective
Relay or SAO Current Sensor. When connected to any other model,
the output voltages will be about the same as those shown in the
above table when the input impedance is 13.3 kΩ.
2. When testing an SE or SAO with the output voltages shown in the
above table, consider the voltage values to be a guideline only.
Output voltage (VDC)
Operating time
setting
34
Threephases
32
30
SE
7 8
SET-3@
28
26
Digital
voltmeter
DV
24
22
20
18
16
14
12
10
8
Current setting range
6
4
2
20
SET-3A 40
80
SET-3B
Q
0
0
0
0
0
2
4
8
16
4
8
16
32
6
12
24
48
8
16
32
64
10
20
40
80
12
24
48
96
14 16 18
20 22 24 26 28
28 32 36
40 44 48 52 56
56 64 72
80 88 96 104 112
112 128 144 160 176 192 208 224
Three-phase current (A)
Can the SE be used for single-phase applications?
Yes it can, but the open-phase element cannot be used. Turn
OFF the open-phase setting on the function setting DIP
switch. Refer to the Q&A section on the SAO Current Sensor
for the overcurrent setting method. Consider using an [email protected] Current Sensor (for single-phase).
Q
What will happen if a control power supply with an
automatic reset is taken from the same circuit as the
motor circuit?
The allowable fluctuation range for a control power supply
with an automatic reset is 85% to 110%. An open phase in
the motor circuit power supply will reduce the voltage to up to
50%. Thus, a power supply with an automatic reset will not
be able to operate.
13
SE
Q
Can the SE be used for three signal-phase lines?
The SE is designed for three-phase power. It cannot be used
for three single-phase lines. Consider using an [email protected]
Current Sensor (for single-phase).
Q
Q
Can two SE Relays be connected to the SET-3@?
No, they cannot. Refer to the Q&A section on the SAO
Current Sensor.
Can the SE be used in an inverter circuit?
The SE may not work properly in an inverter circuit.
• The error in the overload element will increase and the
open-phase element will operate unnecessarily.
• The SE does not contain circuits to remove inverter noise.
Safety Precautions
On Operation
Connections
Connect the phase advancing capacitor to the power supply before
the Current Converter.
Make sure that the polarity is correct when connecting the Current
Converter and relay.
There are cases in which a 100/110 V power supply can be used.
The main reason for using a 100/110 V power supply is to protect a
high-tension motor. With a high-voltage power supply, the voltage
must be reduced with a potential transformer. It is also possible to
use a 100/110 V power supply with the 2E-type (two function) relays.
When using a commercial current transformer with a high-tension or
low -voltage, high-capacity motor, pass the external wiring of the secondary through the holes in the Current Converter.
Use a commercial frequency power supply only for the control power
supply.
When using as a 3E (3 function) relay, connect the three-phase voltage correctly, as with external connections.
When using as a 2E (2 function) relay, it is not necessary to connect
terminal 3 (W).
The Motor Protective Relay cannot be connected to circuits containing thyristors, rectifiers, or VVVF inverters. See explanation under
the heading Use with Thyristors, Rectifiers, or VVVF Inverters, below.
The Motor Protective Relay also cannot be used to detect an overcurrent in an inching run, because the overcurrent detection circuit is
reset at every inching step.
When using an SE relay with a current requirement below 1 A,
increase the number of conductor runs through the holes in the Current Converter.
Use a model SAO sensor for single-phase applications. Refer to the
SAO datasheet.
Mounting
When installing with an 8PFA1 connecting socket, first fasten the
socket firmly to the panel with screws, then plug in the relay and
secure it with a hook. Leave at least 30 mm of space between the
relays for the hooks.
Although there is no particular restriction on the mounting direction, it
is best to mount horizontally.
The recommended panel thickness for panel mounting is 1 to
3.2 mm.
ALL DIMENSIONS SHOWN ARE IN MILLIMETERS.
To convert millimeters into inches, multiply by 0.03937. To convert grams into ounces, multiply by 0.03527.
In the interest of product improvement, specifications are subject to change without notice.
14
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2016.4
In the interest of product improvement, specifications are subject to change without notice.
OMRON Corporation
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(c)Copyright OMRON Corporation 2016 All Right Reserved.
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