YASKAWA A1000

6.5 Alarm Detection
YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual 355
Troubleshooting
6
Digital Operator Display Minor Fault Name
oL5
Mechanical Weakening Detection 1
O
vertorque occurred, matching the conditions specified in L6-08.
Cause Possible Solutions
Minor Fault
(H
2- = 10)
Overtorque occurred, tri
ggering the mechanical
weakening level set to L6-08.
Check for the cause of mechanical weakening.
YES
Digital Operator Display Minor Fault Name
oS
Overspeed
T
he motor speed feedback exceeded the F1-08 setting.
Cause Possible Solutions
Minor Fault
(H
2- = 10)
Overshoot is occurring.
• Increase the settings for C5-01 (Speed Control Proportional Gain
1) and reduce C5-02 (Speed Control Integral
Time 1).
• If using a Closed Loop Vector mode enable Feed
Forward Control and perform Inertia Auto-Tuning.
YES
Incorrect speed feedback scaling if terminal RP is
used as s
peed feedback input in V/f control
• Set H6-02 to value of the speed feedback signal frequency when the motor runs at the maximum speed.
• Adjust the input signal using parameters H6-03 through H6-05.
Incorrect PG pulse number has been set Check and correct parameter F1-01.
Inappropriate parameter settings. Check the setting for the overspeed detection level and the overspeed detection time (F1-08 and F1-09).
Digital Operator Display Minor Fault Name
ov
DC Bus Overvoltage
T
he DC bus voltage exceeded the trip point.
For 200 V class: approximately 410 V
For 400 V class: approximately 820 V
Cause Possible Solutions
Minor Fault
(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 phas
e advancing capacitor operating on the same drive
input power system.
YES
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
capacito
rs via the drive input power.
Electrical signal interference causes the drive to
operate incorrectly.
• Review possible solutions for handling electrical signal interference.
• Review section on handling electrical signal interference a
nd check control circuit lines, main circuit lines and
ground wiring.
• If the magnetic contactor is identified as a source of noi
se, 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.
Electrical signal 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
Minor Fault
(H2- = 10)
MEMOBUS/Modbus test has finished normally. This
verifies that the test was successful. No output
Digital Operator Display Minor Fault Name
PGo
PG Disconnect (for Control Mode with PG)
D
etected when no PG pulses are received for a time longer than setting in F1-14.
Cause Possible Solutions
Minor Fault
(H
2- = 10)
PG cable is disconnected.
Reconnect the cable.
YES
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 h
as become disconnected.
Cause Possible Solutions
Minor Fault
(H
2- = 10)
PG cable is disconnected.
Reconnect the cable. Check the setting of F1-20. YES
Digital Operator Display Minor Fault Name
rUn
Motor Switch during Run
A
command to switch motors was entered during run.
Cause Possible Solutions
Minor Fault
(H
2- = 10)
A motor switch command was entered during run. Change the operation pa
ttern so that the motor switch command is entered while the drive is stopped. YES