Cause:
- at standstill, the internally measured DC link voltage is higher than the switch-on voltage of the brake chopper
Remedial action:
- Compare the displayed value "U_DC" in the "Brake-Chopper" info menu with the measured value at the DC+ and DC- terminals (measuring range 1000 VDC, ATTENTION: high voltage). If the displayed voltage deviates by more than 5 %, the device is defective. If the measured voltage is greater than 620 V, the mains voltage does not conform to the standard.
- check the supply voltage between mains phases, max. value = 440 VAC
- check if the synchronous motor rotates at standstill
- switch ZAdyn off and on again