Table of Contents
Advertisement
20 Troubleshooting
Code
Name
ov2
DC Bus Overvoltage 2
PE1, PE2
PLC Faults
PF
Input Phase Loss
SC
Short Circuit/IGBT Failure
SCF
Safety Circuit Fault
SEr
Speed Search Retries Exceeded
SPCNR
Single Phase Converter Not Ready
STPo
Motor Step-Out Detected
94
Causes
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 set A1-02 = 0 [Control Method
Selection = V/f Control] and 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.
Speed search does not complete at start when you use
an induction motor in EZOLV control.
The wiring is too long and DC bus voltage is too
large.
The communication option detected a fault.
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.
The main circuit capacitors have become
unserviceable.
Overheating caused damage to the motor or the motor
insulation is not satisfactory.
The safety circuit is broken.
The speed search-related parameters are set
incorrectly.
When YC-14 = 0 [Behavior when SPC is Not Ready
= Coast to Stop - Fault], the digital input set to H1-xx
= BE [MFDI Function Selection = Single Phase
Converter Ready NC] deactivated to show the
attached converter is faulted or not ready.
The motor code is set incorrectly for PM Control
Methods.
YASKAWA TOEPC7106171GA FP605 Drive Installation & Primary Operation
Possible Solutions
• 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 KEB, 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.
• Adjust n8-45 [Speed Feedback Detection Gain] and n8-47 [Pull-
in Current Comp Filter Time] settings.
When E9-01 = 0 [Motor Type Selection = Induction (IM)], set b3-
24 = 2 [Speed Search Method Selection = Current Detection 2].
• Shorten the shielded motor cable.
• Decrease the carrier frequency.
• If the power supply has a neutral ground, switch on the internal
EMC filter.
Refer to the manual for the communication option card.
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].
• Examine the capacitor maintenance time in monitor U4-05
[CapacitorMaintenance]. If U4-05 is more than 90%, replace the
control board or the drive. For information about replacing the
control board, contact Yaskawa or your nearest sales
representative.
• If drive input power is correct and the fault stays, replace the
control board or the drive. For information about replacing the
control board, contact Yaskawa or your nearest sales
representative.
Measure the motor insulation resistance, and replace the motor if
there is electrical conduction or unserviceable insulation.
• Make sure that you ground the drive correctly and re-energize the
drive.
• If the fault stays, replace the control board or the drive. For
information about replacing the control board, contact Yaskawa
or your nearest sales representative.
• Decrease b3-10 [Speed Estimation Detection Gain].
• Increase b3-17 [Speed Est Retry Current Level].
• Increase b3-18 [Speed Est Retry Detection Time].
• Do Auto-Tuning again.
• Examine the wiring between the drive and converter.
• Examine the error code on converter.
• Set E5-01 [PM Motor Code Selection] correctly as specified by
the motor.
• For specialized motors, refer to the motor test report and set E5-
xx correctly.
Advertisement
Table of Contents
