Drive internal circuitry is worn.
• Check the maintenance time for the capacitors (U4-05).
• Replace either the control board or the entire drive if U4-05 exceeds 90%. For instructions on replacing
the control board, contact Yaskawa or your nearest sales representative.
The drive input power transformer is too
small and voltage drops when the power is
switched on.
• Check for an alarm when the magnetic contactor, line breaker, and leakage breaker are closed.
• Check the capacity of the drive input power transformer.
Air inside the drive is too hot.
Check the temperature inside the drive.
The CHARGE light is broken or
disconnected.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact
Yaskawa or your nearest sales representative.
Digital Operator Display
Minor Fault Name
voF
Output Voltage Detection Fault
There is a problem with the output voltage.
Cause
Possible Solutions
Hardware is damaged.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact
Yaskawa or your nearest sales representative.
2.5 Alarm Detection
212
YASKAWA ELECTRIC SIEP YEAHHP 01B YASKAWA AC Drive – A1000 HHP Programming Manual