64
YASKAWA
TOEPC71061723A YASKAWA AC Drive CR700 Quick Start Guide
Code
Name
Causes
Possible Solutions
oL1
Motor Overload
The load is too heavy
Decrease the load.
Note:
The value set in
U4-16 [Motor Overload Estimate(oL1)]
must
be less than 100 before
oL1
can be reset.
The acceleration/deceleration time or cycle time is
too short.
•
Examine the acceleration/deceleration times and the motor
start/stop frequency (cycle time).
•
Increase the values set in
C1-01 to C1-08 [Acceleration/
Deceleration Time]
.
Overload occurred while running at low speed.
•
Decrease 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.
L1-01 [Motor Overload Protection Select]
is not set
correctly.
Set
L1-01
in accordance with the motor characteristics if a drive
dedicated motor is used.
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 [V/f Pattern for Motor 2]
. 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 [Base Frequency]
correctly.
Set
E1-06
correctly to the rated frequency that indicated on the
motor nameplate.
Multiple motors are running off the same drive.
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.
The characteristics of the electronic thermal
protector and the characteristics of the motor
overload do not match.
•
Examine the motor characteristics and set
L1-01 [Motor
Overload (oL1) Protection]
correctly.
•
Connect a thermal overload relay to the motor.
The electronic thermal protector is operating at the
wrong level.
Set
E2-01 [Motor Rated Current (FLA)]
correctly to the value
specified by the motor nameplate.
Motor loss due to overexcitation operation is
increasing.
•
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]
.
The output current is fluctuating due to input power
supply phase loss.
Make sure that there is no phase loss, and repair problems.
oL2
Drive Overload
The load is too heavy.
Decrease the load.
The acceleration/deceleration time or cycle time is
too short.
•
Examine the acceleration/deceleration times and the motor
start/stop frequency (cycle time).
•
Increase the values set in
C1-01 to C1-08 [Acceleration/
Deceleration Time]
.
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-xx [V/f Pattern Parameters]
settings. Decrease the
values set in
E1-08 [Mid Point A Voltage]
and
E1-10
[Minimum Output Voltage]
. For motor 2, adjust
E3-xx [V/f
Pattern for Motor 2]
settings. Decrease the values set in
E3-08
[Motor 2 Mid Point A Voltage]
and
E3-10 [Motor 2 Minimum
Output Voltage]
. For motor 3, adjust
E7-xx [V/f Pattern for
Motor 3]
settings. Decrease the values set in
E7-08 [Motor 3
Mid Point A Voltage]
and
E7-10 [Motor 3 Minimum Output
Voltage]
.
Note:
If
Ex-08
and
Ex-10
are set too low, the overload tolerance will
decrease at low speeds.
The drive capacity is too small.
Replace the drive with a larger capacity model.
Overload occurred while running at low speed.
•
Decrease the load when running at low speed.
•
Replace the drive with a larger capacity model.
•
Decrease the value set in
C6-02 [Carrier Frequency
Selection]
.
Torque compensation gain is too large.
Decrease the value set in
C4-01 [Torque Compensation Gain]
so
that the motor does not stall.