1332 TROUBLESHOOTING GUIDE

1332 TROUBLESHOOTING GUIDE
Maintenance
The Drive is convection or fan cooled by air flowing through the heat sink slots. The slots must never be allowed to become
obstructed with dirt or foreign matter. Periodically check and clean the heat sink slots. Air flow must never be restricted in any way.
Troubleshooting Prechecks
The following descriptions indicate the operation of protective circuitry in the Bulletin 1332. What is thought to be an operational
problem with the Drive may, in reality be, normal operation of the Drive protective circuitry. Refer to the following descriptions
before attempting to troubleshoot what may seem to be a Drive related malfunction.
Overcurrent Stall Protection
Function: If overcurrent, which is 140% of rated Drive current, flows during acceleration of the motor, the Overcurrent Stall
Protection Circuit operates. This circuit stops the rise of frequency temporarily in order to avoid currents in excess of
140% and an OVERCURRENT trip. When load current falls below 140%, this circuit lets the frequency rise again, and
continue acceleration to set frequency.
Remarks: If this function is not appropriate for the application, it can be eliminated by turning off DSWl, switch 3.
Overvoltage Stall Protection
Function: If DC bus voltage rises above a preset bus level by regenerative energy during deceleration of the motor, the Overvoltage
Stall Protection Circuit stops frequency decrease temporarily in order to prevent an OVERVOLTAGE trip. When
regenerative energy decreases and bus voltage falls below this level, this circuit lets frequency fall again and decelerate to
set frequency.
Remarks: If this function is not appropriate for the application, it can be eliminated by turning off DSWl, switch 2.
Overcurrent Protection
Function: If overcurrent exceeding 200% of rated current of the inverter flows, the protective circuit operates, stops operation of
transistors and annunciates the condition. The "OVERCURRENT" LED illuminates.
Remarks:
1. Inertia of the load is excessively large, and acceleration time is extremely short.
2. The motor experienced an excessive overload condition while operating.
3. A short circuit exists in the output leads or motor windings.
4. A device in the Drive inverter section output has short circuited.
Overvoltage Protection
Function: When bus voltage rises above a preset level by a high line or regenerative energy, the protective circuit operates, stops
operation of transistors, and annunciates the condition. The "OVERVOLTAGE" LED illuminates.
Remarks: Extremely short deceleration time is the main cause. Increase the deceleration time by adjusting the pot VR3. If this
condition occurs while at rated speed the condition might be considered an overhauling load. In this case and when
deceleration time is critical, a dynamic brake is required.
Momentary Power Failure Protection
Function: When incoming line power failure exceeding 15ms occurs, the protective circuit operates to prevent misoperation and
stops operation of transistors. If momentary power failure is within 15ms, operation continues.
Undervoltage Protection
Function: When incoming line voltage falls below 90%, a protective circuit operates to prevent misoperation, stop operation of
transistors and annunciate the condition. The "LOW VOLTAGE" LED illuminates.
Remarks: When it is desired to restart automatically after incoming line voltage is reapplied, remove the jumper CN6.
Overtemperature Protection
Function: When temperature of the heat sink rises and the cooling effect to transistors is reduced, the protective circuit stops
operation of transistors and annunciates the condition. The "TEMP" LED illuminates.
Remarks: Check specifications and ambient temperature around the Drive and the cooling fan operation (7.5 - 20 HP units).
Fault Trip
Function: It is possible that the Drive has stopped by means of an external interlock. The interlocks (e.g. thermal overload relay,
external sequence circuit) are connected to terminals (14) and (15). The "AUX" LED will illuminate when an external
Fault has occurred.
Troubleshooting Guide
The following charts indicate several Drive malfunctions and the approved procedure for correcting these malfunctions.
WARNING: Voltages behind the enclosure cover are atbus voltage or incoming line potential. Hazards off electrical shock exist if
accidental contact is made with voltage carrying components during troubleshooting procedures where power must be applied.
WARNING: Before proceeding with any maintenance or troubleshooting activity, allow at least one minute after input power has
been removed to allow for bus circuit discharge. A bus Discharge LED is incorporated on the Drive to provide visual indication of
the presence of bus voltage. The bus voltage may be verified by using a voltmeter to measure the voltage between terminals "P" (+)
and "N" (-) on the Power Terminal Block. Do not attempt any servicing until the LED has extinguished or the bus voltage has
diminished to zero.
Hazards of electrical shock exist if accidental contact is made with parts carrying bus voltage.
1. Motor Does Not Run - Fault LED's Are Not Illuminated
Is rated input voltage present at terminals
Ll, L2 and L3?
No
Check input side for breaker trip, contactor coil
malfunction, blown fuse, etc.
Yes
Is motor connected securely to output
terminals M1, M2 and M3 of Power
Terminal Block? Are there any broken
wires etc.?
No
Verify and change connections if necessary. Check motor
thermal overloads.
Yes
Is selector switch SW3 set for appropriate
start control?
SW3-
Local - START/STOP by SW1
No
Remote - START/STOP by
terminals 9, 10, 11. Refer to
section 3.6 for proper wiring.
Yes
Is the proper speed reference being used?
No
SW4 -
Local - The Local FREQUENCY pot is the speed
reference signals at terminals 3, 4, and 5 will have
an effect on Drive operation.
Remote - Speed input signals at terminals 3, 4,
and 5 are reference signals. Local FREQUENCY
pot has no effect on Drive operation. Check for
proper polarity at the terminal block
Yes
Replace Drive.
2A. Motor Does Not Run Continuously - " OVERCURRENT " LED is Illuminated
"OVERCURRENT" LED
is illuminated.
Yes
Does a short circuit to ground exist between
the Drive output and motor?
Yes
Remove the cause of the short circuit.
Yes
Increase the acceleration time or switch the
Overcurrent Stall Protection Circuit ON
(DSWl-3).
No
Is acceleration time too short and is the
Overcurrent Protection circuit OFF(DSW1-3)?
No
Is load within the rated current of the
Drive?
No
Lighten the load or replace the drive
with an appropriate size.
Yes
Does the "OVERCURRENT" LED
No
illuminate even if the output terminals are
"open?" (Open circuit at terminals Block).
|
Yes
|
Replace the Drive.
Verify motor operation by line operating the
motor or repeating the above steps. Is proper
motor operation observed?
|
|
Yes
No
|
|
Consult motor
manufacturer's
instruction manual.
2B. Motor Does Not Run Continuously- " OVERVOLTAGE " LED is Illuminated
"OVERVOLTAGE" LED is
illuminated
Yes
Is deceleration time too short? Is
Over-voltage Protection Circuit Off
(DSW1-2)
Yes
Increase the deceleration time or switch
the Overvoltage Stall Protection Circuit
ON (DSW1-2).
No
Does the Drive and motor encounter an
overhauling load (load increases motor
speed beyond set speed)?
Yes
Install the Dynamic Brake option.
2C. Motor Does Not Run Continuously- LOW VOLTAGE" LED is Illuminated
"LOW VOLTAGE" LED is
illuminated.
Yes
Incoming line voltage
------------------------------------------>
Monitor incoming line voltage. Correct
the low voltage condition.
2D. Motor Does Not Run - "TEMP" LED is Illuminated
"TEMP" LED is illuminated.
Yes
Is ambient temperature above the rated
limit of 50°C? Is the cooling fan
rotating (7.5 - 20 HP units)? Is the
heatsink dirty or cooling fins clogged?
Yes
Lower the ambient temperature or
replace the cooling fan (7.5 - 20 HP
units). Clean heat sink.
2E. Motor Does Not Run - "AUX" LED is Illuminated
"AUX" LED is illuminated.
Yes
Are interlocks connected to
terminals(14) and (15) open?
Remove the cause of the Fault
interlock trip or jumper terminals 14
and 15 if external interlocks are not
used.
Yes
3. Fuse Blown
Has wiring (input, output) of the Power
Circuit caused a ground Fault?
Yes
Repair the ground Fault.
No
Replace fuse with the one that has suitable
capacity. Refer to section 2.1 of this manual
for more information.
No
Is the capacity of the fuse sized
correctly (see section 2.1 )?
Yes
Are input terminals (L1, L2 and L3)
and output terminals (M1, M2 and M3)
correctly·wired?
No
Make changes in wiring as necessary. Does
fuse still blow?
/
\
Yes
Yes
\
/
Replace Drive
4. Motor Generates an Excessive Amount of Heat
Is full load demanded continuously at
low frequency?
Yes
Reduce the load. Consult motor
manufacturer for thermal limitations at
frequencies below 30 Hz.
Yes
Load is beyond the motor capacity.
Check mechanical installation. Is
motor/Drive undersized?
No
Is motor operating above full load
current?
No
Check motor and wiring connections
for an open phase condition.
5. Drive will Not Reverse in Local Mode
Is the Local/Remote selector switch
(SW3) in the Remote position?
Yes
Position SW3 to Local, permitting Local
forward/reverse and start/stop control.
Yes
Replace jumper if Local reversing is desired.
No
Has the Operator Panel been modified
No
Replace Drive.