When a fault occurs, the VFD trips and a fault signal is output.
Note: If faults other than these appear, contact PENN by Johnson Controls
Application Engineering at 1-414-524-5535 or 1-800-275-5676.
Table 1. Overcurrent Trip During Acceleration
| Operation Panel Indication |
E.OC1 |
| Description |
When the VFD output current reaches or exceeds
approximately 200% of the rated current during acceleration, the
protective circuit is activated and the VFD trips. |
| Check Point |
- Check for sudden acceleration.
- Check for output short-circuit/ground fault.
- Check that the P. 3 setting is not 60Hz when the motor rated
frequency is 50Hz.
|
| Corrective Action |
- Increase the acceleration time.
- When E.OC1 is always lit at starting, disconnect the motor
once and start the VFD. If E.OC1 is still lit, contact PENN by
Johnson Controls Application Engineering at 1-414-524-5535 or
1-800-275-5676.
- Check the wiring to make sure that output short
circuit/ground fault does not occur.
- Set 50Hz in P. 3.
|
Table 2. Overcurrent Trip During Constant Speed
| Operation Panel Indication |
E.OC2 |
| Description |
When the VFD output current reaches or exceeds
approximately 200% of the rated current during constant speed
operation, the protective circuit is activated and the VFD
trips. |
| Check Point |
- Check for sudden load change.
- Check for output short-circuit/ground fault.
- Check if the stall prevention operation level is set too
high.
|
| Corrective Action |
- Keep load stable.
- Check the wiring to make sure that output short
circuit/ground fault does not occur.
- Lower the setting of stall prevention operation level.
|
Table 3. Overcurrent Trip During Deceleration or Stop
| Operation Panel Indication |
E.OC3 |
| Description |
When the VFD output current reaches or exceeds
approximately 200% of the rated VFD current during deceleration
(other than acceleration or constant speed), the protective circuit
is activated and the VFD trips. |
| Check Point |
- Check for sudden speed reduction.
- Check for output short-circuit/ground fault.
- Check for too fast operation of the motor's mechanical
brake.
- Check if the stall prevention operation level is set too
high.
|
| Corrective Action |
- Increase the deceleration time.
- Check the wiring to make sure that output short
circuit/ground fault does not occur.
- Check the mechanical brake operation.
- Lower the setting of stall prevention operation level.
|
Table 4. Regenerative Overvoltage Trip During Acceleration
| Operation Panel Indication |
E.OV1 |
| Description |
If regenerative energy causes the VFD's internal main
circuit DC voltage to reach or exceed the specified value, the
protective circuit is activated and the VFD trips. The circuit may
also be activated by a surge voltage produced in the power supply
system. |
| Check Point |
Check that the setting of P. 22 is not too small. |
| Corrective Action |
Set P. 22 correctly. |
Table 5. Regenerative Overvoltage Trip During Constant Speed
| Operation Panel Indication |
E.OV2 |
| Description |
If regenerative energy causes the VFD's internal main
circuit DC voltage to reach or exceed the specified value, the
protective circuit is activated to stop the VFD output. The circuit
may also be activated by a surge voltage produced in the power
supply system. |
| Check Point |
Check that the setting of P. 22 is not too small. |
| Corrective Action |
Set P. 22 correctly. |
Table 6. Regenerative Overvoltage Trip During Deceleration or Stop
| Operation Panel Indication |
E.OV3 |
| Description |
If regenerative energy causes the VFD's internal main
circuit DC voltage to reach or exceed the specified value, the
protective circuit is activated to stop the VFD output. The circuit
may also be activated by a surge voltage produced in the power
supply system. |
| Check Point |
Check for sudden speed reduction. |
| Corrective Action |
Increase the deceleration time. |
Table 7. Drive Overload Trip (Electronic Thermal O/L Relay Function)
| Operation Panel Indication |
E.THT |
| Description |
If the temperature of the output transistor element exceeds
the protection level under the condition that a current not less than
the rated VFD current flows and overcurrent trip does not occur (200% or
less), the electronic thermal relay activates to stop the VFD output.
(Overload capacity 150% 60s, 200% 0.5s) |
| Check
Point |
- Check that acceleration/deceleration time is not too short.
- Check that torque boost setting is not too large (small).
- Check the motor for use under overload.
- Check for too high surrounding air temperature.
|
| Corrective Action |
- Increase acceleration/deceleration time.
- Adjust the torque boost setting.
- Reduce the load weight.
- Set the surrounding air temperature to within the
specifications.
|
Table 8. Motor Overload Trip (Electronic Thermal O/L Relay Function)
| Operation Panel Indication |
E.THM |
| Description |
The electronic thermal relay function in the VFD detects
motor overheat due to overload or reduced cooling capability during
constant-speed operation, and pre-alarm (TH display) is output when the
integrated value reaches 85% of the P. 9 setting, and the protection
circuit is activated to stop the VFD output when the integrated value
reaches the specified value. When running a special motor such as a
multi-pole motor or multiple motors, provide a thermal relay on the VFD
output side since such motors cannot be protected by the electronic
thermal relay function. |
| Check
Point |
- Check the motor for use under overload.
- Check that the stall prevention operation setting is
correct.
|
| Corrective Action |
- Reduce the load weight.
- Check that the stall prevention operation setting is
correct.
|
Table 9. Heatsink Overheat
| Operation Panel Indication |
E.FIN |
| Description |
If the heatsink overheats, the temperature sensor is actuated
and the VFD trips. The FIN signal can be output when the temperature
becomes approximately 85% of the heatsink overheat protection operation
temperature. |
| Check
Point |
- Check for too high surrounding air temperature.
- Check for heatsink clogging.
- Check that the cooling fan is not stopped (Check that
FN is not displayed on the operation
panel).
|
| Corrective Action |
- Set the surrounding air temperature to within the
specifications.
- Clean the heatsink.
- Replace the cooling fan.
|
Table 10. Stall Prevention Stop
| Operation Panel Indication |
E.OLT |
| Description |
If the output frequency has fallen to 1Hz by stall prevention
operation and remains for 3 seconds, a fault (E.OLT) appears and the VFD
trips. OL appears while stall prevention is being activated. E.OLT
may not occur if stall prevention (OL) is activated during output
phase loss.
|
| Check
Point |
Check the motor for use under overload. |
| Corrective Action |
Reduce the load weight. (Check the P. 22 setting.) |
Table 11. Brake Transistor Alarm Detection
| Operation Panel Indication |
E.BE |
| Description |
When a brake transistor alarm has occurred due to the large
regenerative energy from the motor, the brake transistor alarm is
detected and the VFD trips. In this case, the VFD must be powered OFF
immediately.
|
| Check
Point |
Reduce the load inertia. |
| Corrective Action |
Replace the VFD. |
Table 12. Output Phase Loss
| Operation Panel Indication |
E.LF |
| Description |
If one of the three phases (U, V, W) on the VFD's output side
(load side) is lost during VFD operation (except during DC injection
brake operation and when output frequency is under 1Hz), VFD stops the
output. Whether the protective function is used or not is set with
P.251. |
| Check
Point |
Check the wiring. (Check that the motor is normal.) Check
that the capacity of the motor used is not smaller than that of the
VFD.
|
| Corrective Action |
Wire the cables properly. Check the P.251
setting.
|
Table 13. Retry Count Excess
| Operation Panel Indication |
E.RET |
| Description |
If operation cannot be resumed properly within the number of
retries set, this function trips the VFD. This function is available
only when P. 67 is set to a value other than 0. When P. 67 is set to 0,
this protective function does not function. P. 67 is factory-set to
3. |
| Check
Point |
Find the cause of fault occurrence. |
| Corrective Action |
Eliminate the cause of the error preceding this error
indication. |
Table 14. CPU Fault
| Operation Panel Indication |
E.5 |
| E.CPU |
| Description |
Stops the VFD output if the communication fault of the
built-in CPU occurs. |
| Check
Point |
Check for devices producing excess electrical noises around
the VFD. |
| Corrective Action |
Take measures against noises if there are devices producing
excess electrical noises around the VFD. Contact PENN by Johnson
Controls Application Engineering at 1-414-524-5535
or1-800-275-5676.
|
Table 15. Inrush Current Limit Circuit Fault
| Operation Panel Indication |
E.IOH |
| Description |
This function is activated when the resistor of the inrush
current limit circuit overheats. |
| Check
Point |
Check that frequent power ON/OFF is not repeated. |
| Corrective Action |
Configure a circuit where frequent power ON/OFF is not
repeated. If the problem still persists after taking the above measure,
please contact your sales representative. |
Table 16. Analog Input Fault
| Operation Panel Indication |
E.AIE |
| Description |
Appears if voltage (current) is input to terminal 4 when the
setting in P.267 and the setting of the voltage/current input switch are
different. |
| Check
Point |
Check the setting of P.267 and the voltage/current input
switch. |
| Corrective Action |
Either give a frequency command by current input or set
P.267, and voltage/current input switch to voltage input. |
Table 17. Safety Circuit Fault
| Operation Panel Indication |
E.SAF |
| Description |
Appears when safety circuit is malfunctioning. Appears when
one of the lines between S1 and SC, or between S2 and SC is
opened. |
| Check
Point |
Verify that the jumper wire connects together terminals S1,
S2, and SC. |
| Corrective Action |
Connect terminals S1, S2, and SC. |