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Voltage Sensor
LG2
CSM_LG2_DS_E_4_2
Compact, Economical Plug-in Type Voltage
Sensing Relay
• DPDT output contacts expand the application of the Sensor to
wide-ranging fields including control, alarms, and indication.
• Voltage control is possible in the same easy manner as electromagnetic relays, as the output relay of the sensor can be driven
directly with a detection signal.
• Wide voltage setting range with fine setting capability.
Model Number Structure
■ Model Number Legend
LG2-@@
1
1.
2 3
Voltage sensor
2, 3. Operating Voltage
AB:
DB:
100, 110, 200 VAC
12, 24, 48, 100 VDC
Ordering Information
■ List of Models
Detected voltage
Model
AC
LG2-AB (100 VAC)
LG2-AB (200 VAC)
LG2-AB (110 VAC)
DC
LG2-DB (12 VDC)
LG2-DB (24 VDC)
LG2-DB (48 VDC)
LG2-DB (100 VDC)
■ Connecting Socket
Socket
Type
Bracket
Model
Model
Front-mounting socket
PF083A
PFC-A7
Back-mounting socket
PL08
PLC-8
Note: Use the above sockets to mount the Voltage Sensor securely
and prevent problems, such as faulty contact.
1
LG2
Specifications
■ Ratings
Item Detected voltage
Rated voltage
Load
Setting range
Power/VA
Must-operate Must-release
consumption (SET) voltage
(RESET)
(percentage
voltage
of rated
(percentage
value)
of rated
value)
Control output
Rated carry
current
Switching capacity
Rated
operating
voltage
Rated operating current
Resistive
load
(cosφ = 1)
Model
LG2-AB
100 VAC
200 VAC
50/60 Hz
5 VA max.
110 VAC
50/60 Hz
LG2-DB
Note: 1.
2.
3.
4.
12 VDC
24 VDC
48 VDC
100 VDC
3 W max.
75% to 120%
70% to 115%
80% to 110%
75% to 105%
75% to 120%
70% to 115%
5A
100 VAC
200 VAC
28 VDC
110 VDC
5A
2A
5A
0.2 A
Inductive
load
(cosφ = 0.4,
L/R = 7 ms)
3A
1.2 A
2A
0.1 A
Set the must-operate voltage higher than the must-release voltage by at least 5% of the rated value.
Smoothing is required for the detected DC voltage.
The maximum applied voltage is 120% of the rated value.
Special models enabling a rated voltage of 220 V are available. The setting range for these models is 80% to 110%.
■ Characteristics
Repeat accuracy
±3% max. (with voltage fluctuations at the rate
of 1 V/s)
Variation due to
temperature
change
±5% max. (within the range 20 °C +20/−30 °C)
Operate time
0.5 s max. (when input changes from 0 V to
120% must-operate voltage)
Release time
0.5 s max. (when input changes from 120% of
the must-release voltage to 0 V)
Insulation
resistance
10 MΩ min. at 500 VDC (between electric
circuitry and mounting panel)
Dielectric strength 2,000 VAC, 50/60 Hz for 1 min (between electric
circuitry and mounting panel)
Vibration
Malfunction: 16.7 Hz, 1-mm double amplitude
Shock
Destruction: 294 m/s2 (approx. 30 G)
Service life
Mechanically:
10,000,000 operations min.
Electrically:
50,000 operations min. (at max. applicable
load)
Weight
Approx. 100 g
Ambient
operating
temperature
−10 to 40°C (with no condensation)
2
LG2
Connections
■ Terminal Arrangement
4
5
4
5
3
6
3
6
2
7
2
7
1
1
8
(+)
(−)
The polarity indication for
terminals and applies
to the DC model (LG2-DB).
(The above diagram shows
the rear side of the Relay.)
8
(The above diagram shows
the rear side of the Relay.)
Note: 1. *Type LG2-DB is not equipped with the rectifier circuit.
2. With type LG2-DB, care should be taken to the polarity of
the power supply.
Nomenclature
LG2-DB
VOLTAGE SENSOR
RESET knob
SET knob
RESET
70to115%
SET
75to120%
VOLTAGE
12VDC
Setting Method
Operate Value
Input the actual voltage to be set, and set the SET knob to the point
at which the Relay operates.
Release Value
• With the Relay operating, turn the RESET knob counterclockwise
as far as it will go, and adjust the voltage to the value to be set.
Then, gradually turn the RESET knob clockwise until it reaches the
point where the Relay is released.
Note: After completing the settings, check the settings for the operate
and release values by increasing/decreasing the input voltage.
• The LG2 can be used for undervoltage detection by using the
RESET knob for the operate value and the SET knob for the
release value. The Relay will normally be ON, however, and so the
internal temperature will rise, and this will affect the product service
life.
3
LG2
Dimensions
Note: All units are in millimeters unless otherwise indicated.
LG2-AB, LG2-DB
Mounting Height of
Sensor with Socket
50.5 max.
LG2
LG2
91
107
86
38.5 max.
13.6
16
PF08 (order separately)
PF083A (order separately)
Accessories (Order Separately)
Connecting Socket
PF083A Front Connecting Socket
Eight, M3.5 × 7
sems screws
Terminal
Arrangement
4
7
Mounting
Holes
Two, M4 or 4.5-dia. holes
Applicable Models
APR-S
LG2
2 1 8 7
Two, 4.2-dia.
holes
35.4
52 max.
33±0.2
Note: Mount sockets to applicable models
so that
points downwards.
4
3.5
33
2
41 max.
3 4 5 6
21 max.
(Top View)
PL08 Back Connecting Socket (Solder Terminals)
3.5
4
Terminal
Arrangement
1
4
Two, 2-dia. holes
50.5 max.
40
6
2
3.9
35 max.
5
3
30 dia.
Applicable Models
SE
APR-S
SDV
LG2
SAO
Mounting
Holes
Two, 3.5-dia. or two, M3
socket mounting holes
7
1
8
31-dia. hole
40±0.3
(Top View)
Approx. 20.5
Socket Mounting Track (for PF083A)
Hold-down Clip
Use the Hold-down Clip to secure the Voltage Sensor on the Connecting Socket, as well as to prevent faulty contact.
PFP-100N/PFP-50N Socket Mounting Track
Type of Socket
7.3±0.15
35±0.3
4.5
15
25 10 25
25 10 25
15 (5)*
Applicable type of
Hold-down Clip
PF083A
PFC-A7
PL08
PLC-8
27±0.15
1
1,000 (500)*
* The dimensions given in parentheses are for the PFP-50N Socket Mounting Track.
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.
4
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Change in Specifications.
Product specifications and accessories may be changed at any time based on improvements and other reasons. It is our
practice to change part numbers when published ratings or features are changed, or when significant construction changes are
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Information presented by Omron Companies has been checked and is believed to be accurate; however, no responsibility is
assumed for clerical, typographical or proofreading errors or omissions.
2015.10
In the interest of product improvement, specifications are subject to change without notice.
OMRON Corporation
Industrial Automation Company
http://www.ia.omron.com/
(c)Copyright OMRON Corporation 2015 All Right Reserved.