Lenze MC 1000 Drive

Lenze MC 1000 Drive Fault Codes:

Fault Code and MeaningCause and Remedy
OUTPUT

Output transistor fault:
Output current exceeded 200% of drive rating.
Cause:


  • Phase to ground short.

  • Phase to phase short.

  • FX or AC BOOST set too high.

  • Bad transistor module (IPM).




Remedy:

Check motor wiring and motor for shorts. Check drive settings.
LO VOLTS

Low DC Bus Voltage fault:
DC bus voltage below 60% of normal.
Cause:

Low line voltage.



Remedy:

Check AC input power.
HI VOLTS

High DC Bus Voltage fault:
DC bus voltage above 120% of normal.
Cause:


  • High line voltage.

  • Overhauling load.

  • DECEL rate is set too fast.




Remedy:

Check input voltage. Adjust deceleration time.
HI TEMP

Temperature fault:
Internal drive temperature too high.
Cause:


  • Ambient temperature too high.

  • Fan failure (if equipped).




Remedy:

Check cooling fans and cabinet ventilation.
OVERLOAD

Current Overload fault:
Output current rating exceeded for too long.
Cause:


  • Drive undersized for the application.

  • Problem with motor and/or driven equipment.




Remedy:

Check mechanical load and motor sizing. (Note: 3-minute delay before reset is possible).
PWR TRAN

Power Transient fault:
Low line voltage.
Cause:

AC line dipped or sagged.



Remedy:

Check mains supply stability.
PWR SAG

Power Sag fault:
Control board voltage is below tolerance.
Cause:


  • Erratic AC line.

  • A new control board has been installed that is different from the previous version.




Remedy:

Perform a factory reset using Parameter 65-PROGRAM. This will update the software and allow the fault to be reset.
LANGUAGE

Language fault:
Selected language not present.
Cause:


  • Defective language EEPROM.

  • Language EEPROM (U11) removed after programming.




Remedy:

Replace or reinstall EEPROM.
EXTERNAL

External fault:
TB-13D is open or closed to TB-2, depending on the setting of Parameter 50 – TB13D.
Cause:

External device triggered fault or wiring issue.



Remedy:


  • Check setting of Parameter 50 – TB 13D.

  • Check devices wired between TB13D and TB-2.
DB ERROR

Dynamic Brake fault:
DB circuit has sensed a resistor overload.
Cause:

The DB duty cycle is too high, causing the resistors to overheat.



Remedy:

Reduce duty cycle or check resistor sizing.
CONTROL

Control Board fault:
New software has been installed that is different from the previous version.
Cause:

Software/Hardware mismatch.



Remedy:

Perform a factory reset using Parameter 65-PROGRAM. This will update the software and allow the fault to be reset.
INTERNAL / INTERN (#)

Internal fault:
The micro-processor has sensed a problem.
Cause:


  • Electrical noise on control wiring.

  • Defective microprocessor.




Remedy:

Check control wiring shielding.
FOLLOWER

Loss of Follower fault:
4-20 mA signal at TB-5B is below 2 mA.
Cause:

Signal loss on input.



Remedy:

Parameter 55 – TB5B LOSS is set to FAULT. Check signal source.
Blank Display / TESTING

The power supply has shut down.
(Drive will not run).
Cause:

This can be the result of clogged or failed heatsink fans.



Remedy:


  • Check heatsink fans (if equipped).

  • Clear any obstructions.

  • If they are not clogged, contact the Lenze AC Tech Service Department.