YASKAWA HV600 Series Installation & Primary Operation page 104

19 Troubleshooting
Code Name
oL3 Overtorque Detection 1
oL4 Overtorque Detection 2
oL7 High Slip Braking Overload
oPr Keypad Connection Fault
oS Overspeed
ov Overvoltage
104
Causes
The torque compensation gain is too large.
The speed search-related parameters are set
incorrectly.
Phase loss in the input power supply is causing the
output current to change.
Overload occurred during overexcitation deceleration. • Decrease the value set in n3-13 [OverexcitationBraking (OEB)
A fault occurred on the machine.
Example: The machine is locked.
A fault occurred on the machine.
Example: The machine is locked.
The load inertia is too large.
An external force on the load side rotated the motor.
Something is preventing deceleration on the load
side.
The value set in n3-04 [HSB Overload Time] is too
small.
The keypad is not securely connected to the
connector on the drive.
The connection cable between the drive and the
keypad is disconnected.
There is overshoot.
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 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.
The Short Circuit Braking function was used in OLV/
PM control method.
YASKAWA TOEPC71061732E HV600 Drive Installation & Primary Operation
Possible Solutions
Decrease the value set in C4-01 [Torque Compensation Gain] to
make sure that the motor does not stall.
• Examine the settings for all speed search-related parameters.
• Adjust b3-03 [Speed Search Deceleration Time].
• Set b3-24 = 1 [Speed Search Method Selection = Speed
Estimation] after Auto-Tuning.
• Correct errors with the wiring for main circuit drive input power.
• Make sure that there is no phase loss, and repair problems.
Gain].
• Decrease the value set in n3-21 [HSB Current Suppression
Level].
Examine the machine and remove the cause of the fault.
Examine the machine and remove the cause of the fault.
Decrease deceleration times in C1-02 and C1-04 [Deceleration
Times] for applications that do not use High Slip Braking.
• Increase the value set in n3-04.
• Connect a thermal overload relay to the motor, and set n3-04 =
1200 s (maximum value).
Examine the connection between the keypad and the drive.
• Remove the keypad and connect it again.
• If the cable is damaged, replace it.
Decrease C5-01 [ASR Proportional Gain 1] and increase C5-02
[ASR Integral Time 1].
• Set L3-04 = 1 [Stall Prevention during Decel = General
Purpose].
• Increase the values set in C1-02 or C1-04 [Deceleration Times].
• Perform 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 KEB, overvoltage
suppression, or stall prevention during deceleration.
• Adjust L3-25 [Load Inertia Ratio] to align with the qualities of
the machine.
Connect a braking resistor to the drive.