18 Troubleshooting
72 YASKAWA TOEPC7106170VA GA800 600 V Drive Installation & Primary Operation
Code Name Causes Possible Solutions
Phase loss in the input power supply is causing the
output current to change.
• Correct errors with the wiring for main circuit drive input power.
• Make sure that there is no phase loss, and repair problems.
Overload occurred during overexcitation deceleration. • Decrease the value set in n3-13 [OverexcitationBraking (OEB)
Gain].
• Decrease the value set in n3-21 [HSB Current Suppression
Level].
oL3 Overtorque Detection 1
A fault occurred on the machine.
Example: The machine is locked.
Examine the machine and remove the cause of the fault.
oL4 Overtorque Detection 2
A fault occurred on the machine.
Example: The machine is locked.
Examine the machine and remove the cause of the fault.
oL5 Mechanical Weakening Detection 1
The drive detected overtorque as specified by the
conditions for mechanical weakening detection set in
L6-08 [Mechanical Fatigue Detect Select].
Do a deterioration diagnostic test on the machine side.
oL7 High Slip Braking Overload
The load inertia is too large. • 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.
oPr Keypad Connection Fault
The keypad is not securely connected to the
connector on the drive.
Examine the connection between the keypad and the drive.
oS Overspeed
There is overshoot. • 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.
There is an incorrect number of PG pulses set in the
drive.
Set H6-02 [Terminal RP Frequency Scaling] to the pulse train
frequency during 100% reference (maximum motor rotation speed).
The oS detection level is set incorrectly. Adjust F1-08 [Overspeed Detection Level] and F1-09 [Overspeed
Detection Delay Time].
ov Overvoltage
Deceleration time is too short and regenerative energy
is flowing from the motor into the drive.
• 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.
The acceleration time is too short. • 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].
The braking load is too large. Connect a dynamic braking option to the drive.
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).
1. Examine the motor main circuit cable, terminals, and motor
terminal box, and then remove ground faults.
2. Re-energize the drive.
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
• 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].
The power supply voltage is too high. Decrease the power supply voltage to align with the drive rated
voltage.
The braking resistor or braking resistor unit wiring is
incorrect.
Correct wiring errors in the connection to the braking resistor or
braking resistor unit.
The encoder cable is disconnected or wired
incorrectly.
Examine for wiring errors or disconnected wires in the encoder
cable, and repair problems.
Electrical interference along the encoder cable. Isolate the encoder cable from the drive output line or a different
source of electrical interference.
Electrical interference caused a drive malfunction. • 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.
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