YASKAWA HV600 Technical Reference page 492

6.5 Faults
Code Name
ov Overvoltage
Note:
• The drive detects this error if the DC bus voltage is more than the ov detection level while the drive is running.
• The ov detection level is approximately 410 V for 208/240 V bypasses. The detection level is approximately 820 V for 480 V bypasses.
• Do a Fault Reset to clear the fault.
• Parameter L5-08 [Fault Reset Enable Select Grp2] disables the Auto Restart function.
Code Name
ov2 DC Bus Overvoltage 2
Note:
• The drive detects this fault when the DC bus voltage increases to more than the Stall Prevention Level during Deceleration for the time set in S6-23 [OV2 Detect Time].
• Do a Fault Reset to clear the fault.
• This fault is resettable, but will not auto-restart.
Code Name
PE1, PE2 PLC Faults
Note:
Do a Fault Reset to clear the fault.
Code Name
PF Input Phase Loss
492
Causes
Deceleration time is too short and regenerative energy
is flowing from the motor into the drive.
The acceleration time is too short.
The drive output cable or motor is shorted to ground
(the current short to ground is charging the main
circuit capacitor of the drive through the power
supply).
If the drive detects ov in these conditions, the speed
search-related parameters are incorrect:
• During speed search
• During momentary power loss recovery
• When the drive starts again automatically
• When you do rotational Auto-Tuning
The power supply voltage is too high.
Electrical interference caused a drive malfunction.
The load inertia is set incorrectly.
There is motor hunting.
Causes
The wiring is too long and DC bus voltage is too
large.
Causes
The communication option detected a fault.
Causes
There is a phase loss in the drive input power.
There is loose wiring in the drive input power
terminals.
The drive input power voltage is changing too much.
There is unsatisfactory balance between voltage
phases.
YASKAWA SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference
Possible Solutions
• Set L3-04 = 1 [Stall Prevention during Decel = General
Purpose].
• Increase the values set in C1-02 or C1-04 [Deceleration Times].
• Do Deceleration Rate Auto-Tuning.
• Make sure that sudden drive acceleration does not cause the
fault.
• Increase the values set in C1-01 or C1-03 [Acceleration Times].
• Increase the value set in C2-02 [S-Curve Time @ End of Accel].
• Set L3-11 = 1 [Overvoltage Suppression Select = Enabled].
1. Examine the motor main circuit cable, terminals, and motor
terminal box, and then remove ground faults.
2. Re-energize the drive.
• Examine the settings for all speed search related parameters.
• Set b3-19 ≠ 0 [Speed Search Restart Attempts ≠ 0 times].
• Adjust b3-03 [Speed Search Deceleration Time] setting.
• Do Stationary Auto-Tuning for Line-to-Line Resistance and then
set b3-24 = 1 [Speed Search Method Selection = Speed
Estimation].
• Increase the value set in L2-04 [Powerloss V/f Recovery Ramp
Time].
Decrease the power supply voltage to align with the drive rated
voltage.
• Examine the control circuit lines, main circuit lines, and ground
wiring, and decrease the effects of electrical interference.
• Make sure that a magnetic contactor is not the source of the
electrical interference, then use a Surge Protective Device if
necessary.
• Examine the load inertia settings with overvoltage suppression or
stall prevention during deceleration.
• Adjust L3-25 [Load Inertia Ratio] to align with the qualities of
the machine.
Adjust n1-02 [Hunting Prevention Gain Setting] settings.
Possible Solutions
• Shorten the shielded motor cable.
• Decrease the carrier frequency.
• If the power supply has a neutral ground, switch on the internal
EMC filter.
Possible Solutions
Refer to the manual for the communication option card.
Possible Solutions
Correct errors with the wiring for main circuit drive input power.
Tighten the terminal screws to the correct tightening torque.
• Examine the input power for problems.
• Make the drive input power stable.
• If the input power supply is good, examine the magnetic
contactor on the main circuit side for problems.
• Examine the input power for problems.
• Make the drive input power stable.
• Set L8-05 = 0 [Input Phase Loss Protection Sel = Disabled].