Omron Q2A Series Technical Manual page 265

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 [AI1
Function Selection], H3-10 [AI2 Function Selection], or H3-06 [AI3 Function Selection] = 16 [Mot PTC Input] was set.)
• Do a Fault Reset to clear the fault.
Code Name
oL1 Motor Overload
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 [OL1-4 Auto-Reset Select] disables the Auto Restart function.
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
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 Cool Type for OL1 Calc] 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.
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.
Possible Solutions
• Check the load level, acceleration/deceleration time, and motor
start/stop frequency (cycle time).
• Decrease the load.
• Increase the values set in Acceleration/Deceleration Times C1-
01 to C1-08.
• Set E2-01 [Mot 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 V/f Pattern Parameters E1-04 to E1-10. For motor 2,
adjust E3-04 to E3-10. Decrease the values set in E1-08 [Mid
A Voltage] and E1-10 [Min 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 [MotorOLEstimate (oL1)] < 100.
• Examine the acceleration/deceleration times and the motor
start/stop frequencies (cycle times).
• Increase the value set in Acceleration/Deceleration Times C1-
01 to C1-08.
• 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 V/f Pattern Parameters E1-04 to E1-10. For motor 2,
adjust E3-04 to E3-10. Decrease the values set in E1-08 [Mid
A Voltage] and E1-10 [Min 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 Cool Type for OL1 Calc = Disabled],
connect thermal overload relay to each motor to prevent damage
to the motor.
• Examine the motor qualities and set L1-01 [Motor Cool Type
for OL1 Calc] correctly.
• Connect a thermal overload relay to the motor.
Set E2-01 [Mot Rated Current (FLA)] to the value shown on the
motor nameplate.
• Lower the value set in n3-13 [OverExcBr Gain].
• Set L3-50 ≠ 3 or 4 [StallP@Decel Mode ≠ HiFlux
Overexcitation or HiFlux2 Overexcitation].
• Set L3-04 = 0 [StallP@Decel Enable = Disabled].
• Examine the settings for all speed search related parameters.
• Adjust b3-03 [SpSrch Deceleration Time].
• Set b3-24 = 1 [SpSrch Method Selection = Speed Estimation]
after Auto-Tuning.
Make sure that there is no phase loss, and repair problems.
7.4 Faults
7
265