YASKAWA GA700 Technical Manual page 352

6.4 Faults
Code Name
oH4 Motor Overheat Fault (PTC
Input)
Note:
• The drive detects this fault if the motor overheat signal that was entered to an analog input terminals A1, A2, or A3 is more than the
alarm detection level. (If H3-02, H3-10, or H3-06 = E [MFAI Function Select = Motor Temperature (PTC Input)] was set.)
• Do a Fault Reset to clear the fault.
Code Name
oL1 Motor Overload
352
Causes
The motor has overheated.
Causes
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 match.
The electronic thermal protector is
operating at an incorrect level.
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
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 C1-08
[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 E1-08 and E1-10 are set too low, the overload
tolerance will decrease at low speeds.
Possible Solutions
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 value set in C1-01 to C1-08
[Acceleration/Deceleration Times].
• Lower 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 E1-08 and E1-10 are set 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)] to the
value shown on the motor nameplate.