YASKAWA GA700 Series

Troubleshooting
7
7.4 Fault
YASKAWA SIEPC71061705H GA700 Series Technical Manual 341
Code Name Causes Possible Solutions
oH4 Motor Overheat Fault (PTC Input)
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.
Note:
• When H3-02, H3-10, or H3-06 = E [MFAI Function Selection = Motor Temperature (PTC Input)], the drive detects this fault if the motor overheat signal entered to an
analog input terminal A1, A2, or A3 is more than the alarm detection level.
• Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
oL1 Motor Overload
The load is too heavy. Decrease the load.
Note:
Reset oL1 when U4-16 [Motor oL1 Level] < 100.
The acceleration/deceleration times or cycle times
are too short.
• Examine the acceleration/deceleration times and the motor
start/stop frequencies (cycle times).
• Increase the values set in C1-01 to C1-08 [Acceleration/
Deceleration Times].
Overload occurred while running at low speed. • Decrease the load when running at low speed.
• Increase the motor speed.
• If the motor is run frequently at low speeds, replace the motor
with a larger motor or use a drive-dedicated motor.
Note:
For general-purpose motors, overload can occur while
running at low speed when operating at below the rated
current.
L1-01 [Motor Overload (oL1) Protection] is set
incorrectly.
Set L1-01 in as specified by the motor qualities for a drive-
dedicated motor.
The V/f pattern does not fit the motor qualities. • Examine the ratios between the V/f pattern frequency and
voltage. Decrease the voltage if it is too high compared to the
frequency.
• 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.
E1-06 [Base Frequency] is set incorrectly. Set E1-06 to the rated frequency shown on the motor nameplate.
One drive is operating more than one motor. Set L1-01 = 0 [Motor Overload (oL1) Protection = Disabled],
connect thermal overload relay to each motor to prevent damage
to the motor.
The electronic thermal protector qualities and the
motor overload properties do not align.
• Examine the motor qualities and set L1-01 [Motor Overload
(oL1) Protection] correctly.
• Connect a thermal overload relay to the motor.
The electronic thermal protector is operating at an
incorrect level.
Set E2-01 [Motor Rated Current (FLA)] correctly to the value
specified by the motor nameplate.
There is increased motor loss from overexcitation
operation.
• Lower the value set in n3-13 [OverexcitationBraking (OEB)
Gain].
• Set L3-04 ≠ 4 [Stall Prevention during Decel ≠ Overexcitation/
High Flux].
• Set n3-23 = 0 [Overexcitation Braking Operation = Disabled].
The speed search-related parameters are set
incorrectly.
• 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.
Phase loss in the input power supply is causing the
output current to change.
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].
Note:
• The drive detects this fault if the electronic thermal protector of the drive started the motor overload protection.
• Do a Fault Reset to clear the fault.
• L5-07 [Fault Reset Enable Select Grp1] disables the Auto Restart function.