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VFD68 Variable Frequency Drives Technical Bulletin

Brand
PENN Controls
Product name
VFD68 Three‐Phase Variable Frequency Drive
Document type
Technical Bulletin
Part number
24-7664-3051
Document revision
C
Revision date
2019-08-09
Language
English

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.