YASKAWA V1000 Technical Manual page 272

6.5 Alarm Detection
Cause
Overshoot or undershoot is occurring.
PG pulse settings are incorrect.
Parameter settings are inappropriate.
LED Operator Display
Cause
Surge voltage present in the drive input
power.
• The motor is short-circuited.
• Ground current has over-charged the
main circuit capacitors via the drive
input power.
Noise interference causes the drive to
operate incorrectly.
LED Operator Display
Cause
MEMOBUS/Modbus test has finished
normally.
LED Operator Display
Cause
Pulse input (RP) is disconnected.
Pulse input (RP) wiring is wrong.
Motor brake is engaged.
LED Operator Display
Cause
A motor switch command was entered
during run.
LED Operator Display
272
• 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).
Set the H6-02 (Pulse Train Input Scaling) to the frequency of PG pulses at maximum
motor speed.
Check the setting for the overspeed detection level and the overspeed detection time
(F1-08 and F1-09).
DC Bus Overvoltage
The DC bus voltage exceeded the trip point.
ov
For 200 V class: approximately 410 V
For 400 V class: approximately 820 V (740 V when E1-01 < 400)
• 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.
• Check the motor power cable, relay terminals and motor terminal box for short circuits.
• Correct grounding shorts and turn the power back on.
• 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.
PASS MEMOBUS/Modbus Comm. Test Mode Complete
This verifies that the test was successful.
PG Disconnect (for Simple V/f with PG)
PGo
Detected when no PG pulses received for a time longer than setting in F1-14.
Reconnect the pulse input (RP).
Correct the wiring.
Ensure the brake releases properly
Motor Switch during Run
rUn
A command to switch motors was entered during run.
Change the operation pattern so that the motor switch command is entered while the
drive is stopped.
SE MEMOBUS/Modbus Communication Test Mode Error
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
Minor Fault
Output
(H2-oo =
10)
YES
YES
YES
Minor Fault
Output
(H2-oo =
10)
YES
YES
YES
YES
Minor Fault
Output
(H2-oo =
10)
No output
Minor Fault
Output
(H2-oo =
10)
YES
YES
YES
Minor Fault
Output
(H2-oo =
10)
YES