Cause Possible Solutions
Minor Fault
Output
(H2-oo =
10)
Overshoot or undershoot is occurring.
• Adjust the gain by using the pulse train input parameters (H6-02 through H6-05).
• Adjust the speed feedback accuracy.
• Increase the settings for C5-01 (
Speed Control Proportional Gain 1) and reduce C5-02
(Speed Control Integral Time 1).
YES
PG pulse settings are incorrect.
Set the H6-02 (Pulse Train Input Scaling) to the frequency of PG pulses at maximum
motor speed.
YES
Parameter settings are inappropriate.
Check the setting for the overspeed detection level and the overspeed detection time
(F1-08 and F1-09).
YES
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-oo =
10)
Surge voltage present in the drive input
power.
• Install an AC or DC 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-oo =
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-oo =
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-oo =
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
6.5 Alarm Detection
272
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
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