YASKAWA T1000V - Page 261

6.5 Alarm Detection
YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual 261
Troubleshooting
6
LED Operator Display Minor Fault Name
ov
DC Bus Overvoltage
The DC bus voltage exceeded the trip point.
For 200 V class: approximately 410 V
For 400 V class: approximately 820 V (740 V when E1-01 < 400)
Cause Possible Solutions
Minor Fault
Output
(H2- = 10)
Surge voltage present in the drive input
power.
• Install a DC reactor 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.
YES
• The motor is short-circuited.
• Ground current has over-charged the
main circuit capacitors via the drive
input power.
• Check the motor power cable, relay terminals and motor terminal box for short
circuits.
• Correct grounding shorts and turn the power back on.
YES
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.
YES
Set number of fault restarts (L5-01) to a value other than 0. YES
LED Operator Display Minor Fault Name
PASS MEMOBUS/Modbus Comm. Test Mode Complete
Cause Possible Solutions
Minor Fault
Output
(H2- = 10)
MEMOBUS/Modbus test has finished
normally.
This verifies that the test was successful. No output
LED Operator Display Minor Fault Name
PGo
PG Disconnect (for Simple V/f with PG)
Detected when no PG pulses received for a time longer than setting in F1-14.
Cause Possible Solutions
Minor Fault
Output
(H2- = 10)
Pulse input (RP) is disconnected. Reconnect the pulse input (RP). YES
Pulse input (RP) wiring is wrong. Correct the wiring. YES
Motor brake is engaged. Ensure the brake releases properly YES
LED Operator Display Minor Fault Name
rUn
Motor Switch during Run
A command to switch motors was entered during run.
Cause Possible Solutions
Minor Fault
Output
(H2- = 10)
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.
YES
LED Operator Display Minor Fault Name
SE MEMOBUS/Modbus Communication Test Mode Error
Cause Possible Solutions
Minor Fault
Output
(H2- = 10)
A digital input programmed to 67H
(MEMOBUS/Modbus test) was closed
while the drive was running.
Stop the drive and run the test again. No output