YASKAWA GA800 600 V Drive Installation & Primary Operation page 72

18 Troubleshooting
Code Name
oL3 Overtorque Detection 1
oL4 Overtorque Detection 2
oL5 Mechanical Weakening Detection 1
oL7 High Slip Braking Overload
oPr Keypad Connection Fault
oS Overspeed
ov Overvoltage
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Causes
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 drive detected overtorque as specified by the
conditions for mechanical weakening detection set in
L6-08 [Mechanical Fatigue Detect Select].
The load inertia is too large.
The keypad is not securely connected to the
connector on the drive.
There is overshoot.
There is an incorrect number of PG pulses set in the
drive.
The oS detection level is set incorrectly.
Deceleration time is too short and regenerative energy
is flowing from the motor into the drive.
The acceleration time is too short.
The braking load is too large.
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
The power supply voltage is too high.
The braking resistor or braking resistor unit wiring is
incorrect.
The encoder cable is disconnected or wired
incorrectly.
Electrical interference along the encoder cable.
Electrical interference caused a drive malfunction.
YASKAWA TOEPC7106170VA GA800 600 V Drive Installation & Primary Operation
Possible Solutions
• 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.
Do a deterioration diagnostic test on the machine side.
• Decrease deceleration times in C1-02, C1-04, C1-06, and C1-08
[Deceleration Times] for applications that do not use High Slip
Braking.
• Use a braking resistor to decrease the deceleration time.
Examine the connection between the keypad and the drive.
• Decrease C5-01 [ASR Proportional Gain 1] and increase C5-02
[ASR Integral Time 1].
• Use H6-02 to H6-05 [Pulse Train Input Setting Parameters]to
adjust the pulse train gain.
Set H6-02 [Terminal RP Frequency Scaling] to the pulse train
frequency during 100% reference (maximum motor rotation speed).
Adjust F1-08 [Overspeed Detection Level] and F1-09 [Overspeed
Detection Delay Time].
• Set L3-04 = 1 [Stall Prevention during Decel = General
Purpose].
• Increase the values set in C1-02, C1-04, C1-06, or C1-08
[Deceleration Times].
• Connect a dynamic braking option to the drive.
• Perform Deceleration Rate Auto-Tuning.
• Make sure that sudden drive acceleration does not cause the
fault.
• Increase the values set in C1-01, C1-03, C1-05, or C1-07
[Acceleration Times].
• Increase the value set in C2-02 [S-Curve Time @ End of Accel].
• Set L3-11 = 1 [Overvoltage Suppression Select = Enabled].
Connect a dynamic braking option to the drive.
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].
Decrease the power supply voltage to align with the drive rated
voltage.
Correct wiring errors in the connection to the braking resistor or
braking resistor unit.
Examine for wiring errors or disconnected wires in the encoder
cable, and repair problems.
Isolate the encoder cable from the drive output line or a different
source of electrical interference.
• 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.