Digital Operator Display
Minor Fault Name
ov
DC Bus Overvoltage
The DC bus voltage exceeded the trip point.
• For 400 V class drives: approximately 820 V (740 V when E1-01 is less than 400)
• For 575 V class drives: approximately 1040 V
• For 690 V class drives: approximately 1200 V
Cause
Possible Solutions
Surge voltage present in the drive input
power.
• Install a DC link choke or an AC reactor.
• Voltage surge can result from a thyristor convertor and a phase advancing capacitor operating on the same
drive input power system.
The motor is short-circuited.
• Check the motor power cable, relay terminals and motor terminal box for short circuits.
• Correct grounding shorts and turn the power back on.
Ground current has overcharged the main
circuit capacitors via the drive input power.
Noise interference causes the drive to
operate incorrectly.
• Review possible solutions for handling noise interference.
• Review section on handling noise interference and check control circuit lines, main circuit lines and ground
wiring.
• If the magnetic contactor is identified as a source of noise, install a surge protector to the MC coil.
Set number of fault restarts (L5-01) to a value other than 0.
PG cable is disconnected.
Reconnect the cable.
PG cable wiring is wrong.
Correct the wiring.
Noise interference along PG encoder
wiring.
Separate PG wiring from the source of the noise (often output wiring from the drive).
Digital Operator Display
Minor Fault Name
PASS
MEMOBUS/Modbus Comm. Test Mode Complete
Cause
Possible Solutions
MEMOBUS/Modbus test has finished
normally.
This verifies that the test was successful.
Digital Operator Display
Minor Fault Name
PGo
PG Disconnect (for Control Mode with PG)
Detected when no PG pulses are received for a time longer than setting in F1-14.
Cause
Possible Solutions
PG cable is disconnected.
Reconnect the cable.
PG cable wiring is wrong.
Correct the wiring.
PG encoder does not have enough power. Make sure the correct power supply is properly connected to the PG encoder.
Brake is holding the PG.
Ensure the brake releases properly
Digital Operator Display
Minor Fault Name
PGoH
PG Hardware Fault (detected when using a PG-X3 option card)
PG cable has become disconnected.
Cause
Possible Solutions
PG cable is disconnected.
Reconnect the cable and check the setting of F1-20.
Digital Operator Display
Minor Fault Name
rUn
Motor Switch during Run
A command to switch motors was entered during run.
Cause
Possible Solutions
A motor switch command was entered
during run.
Change the operation pattern so that the motor switch command is entered while the drive is stopped.
2.5 Alarm Detection
210
YASKAWA ELECTRIC SIEP YEAHHP 01B YASKAWA AC Drive – A1000 HHP Programming Manual
Summary of Contents for A1000 HHP
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