YASKAWA FP65U T Series Installation & Primary Operation page 92

20 Troubleshooting
Code Name
oH4 Motor Overheat Fault (PTC Input)
oL1 Motor Overload
oL2 Drive Overload
92
Causes
The motor has overheated.
The load is too heavy.
The acceleration/deceleration times or cycle times are
too short.
Overload occurred while running at low speed.
L1-01 [Motor Overload (oL1) Protection] is set
incorrectly.
The V/f pattern does not fit the motor qualities.
E1-06 [Base Frequency] is set incorrectly.
One drive is operating more than one motor.
The electronic thermal protector qualities and the
motor overload properties do not align.
The electronic thermal protector is operating at an
incorrect level.
There is increased motor loss from overexcitation
operation.
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)
The load is too large.
YASKAWA TOEPC7106171GA FP605 Drive Installation & Primary Operation
Possible Solutions
• 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 C1-04 [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 E1-08 and E1-10 are set too low, the overload tolerance will
decrease at low speeds.
Decrease the load.
Note:
Reset oL1 when U4-16 [Motor oL1 Level] < 100.
• Examine the acceleration/deceleration times and the motor start/
stop frequencies (cycle times).
• Increase the values set in C1-01 to C1-04 [Acceleration/
Deceleration Times].
• 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.
Set L1-01 in as specified by the motor qualities for a drive-dedicated
motor.
• 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.
Set E1-06 to the rated frequency shown on the motor nameplate.
Set L1-01 = 0 [Motor Overload (oL1) Protection = Disabled],
connect thermal overload relay to each motor to prevent damage to
the motor.
• Examine the motor qualities and set L1-01 [Motor Overload
(oL1) Protection] correctly.
• Connect a thermal overload relay to the motor.
Set E2-01 [Motor Rated Current (FLA)] correctly to the value
specified by the motor nameplate.
• 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].
• 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.
Make sure that there is no phase loss, and repair problems.
Gain].
• Decrease the value set in n3-21 [HSB Current Suppression
Level].
Decrease the load.