Applicable Systems
EFC
FEX
FEI
HNC
Symptoms
PWM timer synchronization fault. The drive has detected a synchronization error in the PWM (Pulse Width Modulation) timer that controls IGBT switching.
Possible Causes
- Control board FPGA timing error
- PWM carrier frequency set too high for the hardware
- Interference from another drive on the same power supply
- Firmware version incompatibility with PWM timer hardware
Troubleshooting Steps
- Step 1: Check PWM carrier frequency setting in IndraWorks AS
Frequency within the rated range for the drive model (typically 2-16 kHz) - Step 2: Verify no other drives on the same power supply are causing synchronization issues
Each drive operates independently without interference - Step 3: Power-cycle the drive to reset the PWM timer
Timer synchronizes correctly after restart - Step 4: If fault recurs, reload firmware or replace control module
New control module provides stable PWM timing
How to Reset
1) Check PWM frequency parameter. 2) Power-cycle. 3) Reload firmware. 4) Replace control module if persistent.
Frequently Asked Questions
- Q: What PWM carrier frequency should I use?
Default is typically 4-8 kHz. Higher frequencies reduce motor noise but increase drive heating. Consult the motor and drive specifications.
- Q: Does PWM timer fault affect motor performance?
Yes. PWM timing errors can cause uneven motor torque, increased ripple, and potential motor heating. Address immediately.
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Source: Rexroth IndraDrive HCS/HMS Fault Code List, Bosch Rexroth AG
Category: PLC & VFD
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