13 Troubleshooting
116 YASKAWA TOEPC71061752B GA500 Drive Installation & Primary Operation
Code Name Causes Possible Solutions
oH2
External Overheat (H1-
XX=B)
An external device sent an oH2. 1. Find the external device that output the
overheat alarm.
2. Remove the cause of the problem.
3. Clear the Overheat Alarm (oH2) [H1-xx
= B] set to MFDI terminals S1 to S7.
oH3
Motor Overheat (PTC
Input)
The thermistor wiring that detects
motor temperature is defective.
Correct wiring errors.
A fault occurred on the machine.
Example: The machine is locked.
Examine the machine and remove the cause
of the fault
The motor has overheated. • Check the load level, acceleration/
deceleration time, and motor start/stop
frequency (cycle time).
• Decrease the load.
• Increase the values set in C1-01 to C1-08
[Acceleration/Deceleration Times].
• Set E2-01 [Motor Rated Current (FLA)]
correctly to the value specified by the
motor nameplate.
• Make sure that the motor cooling system
is operating correctly, and repair or
replace it if it is damaged.
• Adjust E1-04 to E1-10 [V/f Pattern
Parameters]. For motor 2, adjust E3-04
to E3-10. Decrease the values set in E1-
08 [Mid Point A Voltage] and E1-10
[Minimum Output Voltage].
Note:
If the values set in E1-08 and E1-10 are
too low, the overload tolerance will
decrease at low speeds.
oL3 Overtorque 1
A fault occurred on the machine.
Example: The machine is locked.
Examine the machine and remove the cause
of the fault
The parameters are incorrect for
the load.
Adjust L6-02 [Torque Detection Level 1]
and L6-03 [Torque Detection Time 1].
oL4 Overtorque 2
A fault occurred on the machine.
Example: The machine is locked.
Examine the machine and remove the cause
of the fault
The parameters are incorrect for
the load.
Adjust L6-05 [Torque Detection Level 2]
and L6-06 [Torque Detection Time 2].
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.
oS Overspeed
There is overshoot. • Decrease C5-01 [ASR Proportional Gain
1] and increase C5-02 [ASR Integral
Time 1].
• Adjust the pulse train gain with H6-02 to
H6-05 [Pulse Train Input Setting
Parameters].
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).
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