YASKAWA CIMR-VU BA0001 Technical Manual page 288

6.5 Alarm Detection
Digital Operator Display
Parameter settings are not appropriate.
There is a fault on the machine side (e.g., the
machine is locked up).
Digital Operator Display
Cause
Overtorque occurred, triggering the
mechanical weakening level set to L6-08.
Digital Operator Display
Cause
Overshoot or undershoot is occurring.
PG pulse settings are incorrect.
Parameter settings are inappropriate.
Digital 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.
Digital Operator Display
Cause
MEMOBUS/Modbus test has finished
normally.
Digital Operator Display
Cause
288
Check parameters L6-05 and L6-06.
• Check the status of the machine being used.
• Remove the cause of the fault.
Mechanical Weakening Detection 1
oL5
Overtorque occurred, matching the conditions specified in L6-08.
Check for the cause of mechanical weakening.
Overspeed (for Simple V/f with PG)
oS
Pulse input (RP) indicates that motor speed feedback exceeded F1-08 setting.
• 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 reactor or DC link choke.
• 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.
Minor Fault Name
Minor Fault Name
Possible Solution
Minor Fault Name
Possible Solution
Minor Fault Name
Possible Solution
Minor Fault Name
Possible Solution
Minor Fault Name
Possible Solution
YASKAWA ELECTRIC SIEP C710606 18F YASKAWA AC Drive – V1000 Technical Manual
YES
Minor Fault
(H2-oo = 10)
YES
Minor Fault
(H2-oo = 10)
YES
Minor Fault
(H2-oo = 10)
YES
Minor Fault
(H2-oo = 10)
No output
Minor Fault
(H2-oo = 10)