Ground Fault Circuit Interrupter (Elcb/Gfci) Trips During Run - YASKAWA L1000A Technical Manual

4.7 Setup Troubleshooting and Possible Solutions

◆ Ground Fault Circuit Interrupter (ELCB/GFCI) Trips During Run

Cause
Excessive leakage current trips ELCB/GFCI ground fault circuit
interrupter.
◆ The Safety Controller Does Not Recognize Safe Disable Monitor Output Signals
(Terminals DM+ and DM-)
Cause
There is faulty wiring in the Safe Disable monitor output terminals.
◆ Riding Comfort Related Problems
The following table describes the most common problems related to ride comfort and proposes countermeasures to those
problems. Before taking any action, make sure the startup procedures have been performed as previously described.
Problem
V/f and OLV
OLV
Rollback at start
CLV
CLV/PM
All
Shock at start All
All
Shock at stop
CLV
CLV/PM
OLV
Jerk occurs due to overshoot
CLV
when the motor reaches top
CLV/PM
speed.
All
154
• Increase the ELCB/GFCI sensitivity or use ELCB/GFCI with a higher threshold.
• Lower the carrier frequency (C6-03).
• Reduce the length of the cable used between the drive and the motor.
• Install a noise filter or reactor on the output side of the drive.
• Check the wiring and logic for the Safe Disable monitor output terminal.
• Correct wiring mistakes.
Control Mode and Possible Cause
Insufficient torque when the brake is released.
DC Injection and brake timing is not optimized.
The slip or torque compensation function acts too slowly.
The speed control is not responding fast enough when the
brake is released.
The Position Lock control loop does not respond fast enough.
Motor torque is not fully established when the brake is
released.
Motor contactor closes too late.
Motor starts turning when the brake is not completely released
or runs against the brake.
Acceleration rate is changing too quickly.
Rollback occurs during brake release.
Brake is applied too early, causing the motor to run against the
brake.
Motor contactor is released before the brake is fully applied.
Rollback occurs before the brake applies at stop.
Too fast torque or slip compensation.
Speed control loop setting is too soft or too hard.
Incorrect motor data.
Inertia compensation function is not set up correctly.
The acceleration rate changes too quickly when reaching the
selected speed.
YASKAWA ELECTRIC SIEP C710616 38F YASKAWA AC Drive - L1000A Technical Manual
Possible Solutions
Possible Solutions
Corrective Action
• Increase the DC Injection Braking Current at Start using parameter S1-02.
• Increase the Minimum Output Frequency Voltage (E1-10) and Medium
Output Frequency Voltage (E1-08) V/f pattern voltages. Make sure, that the
starting and leveling current does not rise too high.
Set the time for DC Injection Braking at Start (S1-04) as short as possible, and
make sure that brake releases completely before the motor starts to turn.
• Decrease the Torque Compensation Time (C4-02).
• Decrease the Slip Compensation Time (C3-02).
Adjust the speed control loop parameters used During Position Lock. Increase
C5-19 and reduce C5-20.
• Adjust the speed control loop parameters used During Position Lock.
Increase C5-19 and reduce C5-20.
• Increase the Position Lock Gain at Start 1 in S3-01 gradually. If vibration
occurs reduce it.
• Increase the Position Lock Gain at Start 2 in S3-02 gradually until rollback
disappears.
Lengthen the Brake Release Delay Time (S1-06) and the time for DC
Injection Braking / Position Lock at Start (S1-04).
Make sure that the contactors are closed before the Up/Down command is
issued.
Increase the DC Injection Braking Time at Start using parameter S1-04.
Decrease the Jerk at Start. Decrease C2-01 if set in m/s
in s.
Refer to "Rollback at start".
Increase the Delay Time to Close the Brake (S1-07). If necessary, also
increase the DC Injection Braking Time at Stop S1-05.
Check the motor contactor sequence.
• Make sure the speed control loop parameters for position lock are adjusted
properly (C5-13 and C5-14).
• Increase the Position Lock Gain at Stop S3-03 gradually until no rollback
occurs. If vibration occurs reduce the gain S3-03.
• Increase the Torque Compensation Delay Time (C4-02).
• Increase the Slip Compensation Delay Time (C3-02).
• Adjust the Speed Control Loop Gain C5-01 and Integral Time C5-02.
• Adjust Inertia Compensation parameters (n5-) if speed control loop
settings cannot solve the problem.
• For induction motors readjust the motor data (E2-), especially the slip
(E2-02) and no-load current values (E2-03), or perform Auto-Tuning again.
• For PM motors readjust the motor data in E5- or perform Auto-Tuning.
If the Inertia Compensation Function is used (n5-01=1) make sure the values
in n5-02 and n5-03 are correct.
Decrease the Jerk at the End of Acceleration. Decrease C2-02 if set in m/s
increase C2-02 if set in s.
, increase C2-01 if set
2
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