YASKAWA GA700 Technical Manual page 288

6.4 Fault
Code Name
Note:
• Detected if the electronic thermal protector of the drive triggered the motor overload protection.
• Perform Fault Reset to clear the fault.
Code Name
oL2 Drive Overloaded
288
Cause
Overload occurred while running at low
speed.
L1-01 [Motor Overload Protection
Select] is not set correctly.
The V/f pattern does not fit the motor
characteristics.
Set E1-06 [Base Frequency] correctly.
Multiple motors are running off the
same drive.
The characteristics of the electronic
thermal protector and the characteristics
of the motor overload do not match.
The electronic thermal protector is
operating at the wrong level.
Motor loss due to overexcitation
operation is increasing.
The speed search-related parameters are
set incorrectly.
The output current is fluctuating due to
input power supply phase loss.
Cause
The load is too heavy.
The acceleration/deceleration time or
cycle time is too short.
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
Possible Solution
• Lower the load when running at low speed.
• Raise the motor speed.
• If the motor is run frequently at low speeds,
either replace it with one that is a size larger or
use a drive dedicated motor.
Note:
If a general-purpose motor is used, overload
may occur while running at low speed even
when operating at below the rated current.
Set L1-01 in accordance with the motor
characteristics if a specialized motor is used.
• Check the ratios between the V/f pattern
frequency and voltage. Lower the voltage if it is
too high relative to the frequency.
• Adjust E1-04 to E1-10 [V/f Pattern Parameters].
For motor 2, adjust E3-04 to E3-10. In particular,
reduce the values set in E1-08 [Mid Point A
Voltage] and E1-10 [Minimum Output Voltage].
Note:
If E1-08 and E1-10 are reduced too much, the
overload tolerance is reduced at low speeds.
Set E1-06 correctly to the rated frequency that
indicated on the motor nameplate.
Set L1-01 = 0 [Motor Overload Protection Select
= Disabled], and then configure a circuit to protect
the motors by connecting a thermal overload relay
to each motor.
• Check the motor characteristics and set L1-01
[Motor Overload Protection Select] correctly.
• Connect a thermal overload relay to the motor.
Set E2-01 [Motor Rated Current (FLA)] correctly
to the value that indicated on the motor nameplate.
• Lower the value set in n3-13 [Overexcitation
Deceleration Gain].
• Set L3-04 ≠ 4 [Decel Stall Prevention Selection
≠ Overexcitation/High Flux].
• Set n3-23 = 0 [Overexcitation Operation Select
= Enabled in both directions].
• Check 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.
Check whether or not there is input phase loss, and
remedy any phase loss.
Possible Solution
Reduce the load.
• Check the acceleration/deceleration time and the
motor start/stop frequency (cycle time).
• Increase the value set in C1-01 to C1-08
[Acceleration/Deceleration Time].