YASKAWA L1000A - Page 303

6.4 Alarm Detection
YASKAWA ELECTRIC SIEP C710616 38F YASKAWA AC Drive - L1000A Technical Manual 303
Troubleshooting
6
Digital 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
For 600 V class drives: approximately 1040 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 over-charged 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 reset (L5-01) to a value other than 0.
Encoder cable is disconnected. Reconnect the cable.
Encoder cable wiring is wrong. Correct the wiring.
Noise interference along encoder wiring. Separate encoder wiring from the source of the noise (often output wiring from the drive).
Digital Operator Display Minor Fault Name
PASS MEMOBUS/Modbus Communication 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
Encoder Disconnected (for Control Mode with Encoder)
Detected when no encoder signal is received for a time longer than setting in F1-14.
Cause Possible Solutions
Encoder cable is disconnected. Reconnect the cable.
Encoder cable wiring is wrong. Correct the wiring.
Encoder does not have enough power. Make sure the correct power supply is properly connected to the encoder.
Motor brake is not released. Ensure the brake releases properly
Digital Operator Display Minor Fault Name
PGoH
Encoder Disconnected (detected when using an encoder)
Encoder cable has become disconnected.
Cause Possible Solutions
Encoder cable is disconnected. Reconnect the cable.
Digital Operator Display Minor Fault Name
SE MEMOBUS/Modbus Self Test Failed
Cause Possible Solutions
A digital input set to 67H (MEMOBUS/Modbus
test) was closed while the drive was running.
Stop the drive and run the test again.
Digital Operator Display Minor Fault Name
TrPC
IGBT Maintenance Time (90%)
IGBTs have reached 90% of their expected performance life.
Note: This alarm will not trigger a multi-function output terminal that is set for alarm output (H2- = 10).
Cause Possible Solutions
IGBTs have reached 90% of their expected
performance life.
Replace the drive.
Digital Operator Display Minor Fault Name
UL3
Undertorque Detection 1
Drive output current (or torque in OLV, CLV, CLV/PM) less than L6-02 for longer than L6-03 time.
Cause Possible Solutions
Inappropriate parameter settings. Check parameters L6-02 and L6-03.
Load has dropped or decreased significantly. Check for broken parts in the transmission system.
Digital Operator Display Minor Fault Name
UL4
Undertorque Detection 2
Drive output current (or torque in OLV, CLV, CLV/PM) less than L6-05 for longer than L6-06 time.
Cause Possible Solutions
Inappropriate parameter settings. Check parameters L6-05 and L6-06.
The load has dropped or decreased significantly. Check for broken parts in the transmission system.
SIEP_C710616_38F_5_0.book 303 ページ ２０１５年１１月９日 月曜日 午後３時３６分