Yaskawa Z1000U HVAC Matrix Bypass - Manual (Page 273)

u Sound from Motor
Cause Possible Solutions
Exceeded 110% of the rated output current of the drive
while operating at low speeds.
• If the output current rises too high at low speeds, the carrier frequency is automatically reduced
and causes a whining or buzzing sound.
• If the sound is coming from the motor, disable carrier frequency derating (L8-38 = 0).
• Disabling the automatic carrier frequency derating increases the chances of an overload fault
(oL2). Switch to a larger capacity motor if oL2 faults occur too frequently.
u Motor Does Not Restart after Power Loss
Cause Possible Solutions
The Run command was not issued again when power
was restored.
• Check the sequence and wiring that has been set up to enter the Run command.
• A relay should be set up to make sure the Run command remains enabled throughout any power
loss.
The relay that is supposed to maintain the Run
command has been switched off.
Check wiring and circuitry for the relay intended to keep the Run command enabled.
u The Safety Controller Does Not Recognize Safe Disable Monitor Output Signals
(Terminals DM+ and DM-)
Cause Possible Solutions
There is faulty wiring in the Safe Disable monitor
output terminals.
• Check the Safe Disable monitor output terminal wiring.
• Correct any wiring mistakes.
6.9 Troubleshooting without Fault Display
YASKAWA SIEP YAIZ1D 01A Z1000U HVAC MATRIX Drive Bypass Technical Manual 273
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Diagnostics & Troubleshooting