YASKAWA
TOEPC71061732E HV600 Drive Installation & Primary Operation
103
Code
Name
Causes
Possible Solutions
oL1
Motor Overload
The load is too heavy.
Decrease the load.
Note:
Reset
oL1
when
U4-16 [Motor oL1 Level]
< 100.
The acceleration/deceleration times or cycle times are
too short.
•
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]
.
Overload occurred while running at low speed.
•
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.
L1-01 [Motor Overload (oL1) Protection]
is set
incorrectly.
Set
L1-01
in as specified by the motor qualities for a drive-dedicated
motor.
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
. 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.
E1-06 [Base Frequency]
is set incorrectly.
Set
E1-06
to the rated frequency shown on the motor nameplate.
One drive is operating more than one motor.
Set
L1-01 = 0 [Motor Overload (oL1) Protection = Disabled]
,
connect thermal overload relay to each motor to prevent damage to
the motor.
The electronic thermal protector qualities and the
motor overload properties do not align.
•
Examine the motor qualities and set
L1-01 [Motor Overload
(oL1) Protection]
correctly.
•
Connect a thermal overload relay to the motor.
The electronic thermal protector is operating at an
incorrect level.
Set
E2-01 [Motor Rated Current (FLA)]
correctly to the value
specified by the motor nameplate.
There is increased motor loss from overexcitation
operation.
•
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]
.
The speed search-related parameters are set
incorrectly.
•
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.
Phase loss in the input power supply is causing the
output current to change.
Make sure that there is no phase loss, and repair problems.
Overload occurred during overexcitation deceleration.
•
Decrease the value set in
n3-13 [OverexcitationBraking (OEB)
Gain]
.
•
Decrease the value set in
n3-21 [HSB Current Suppression
Level]
.
oL2
Drive Overload
The load is too large.
Decrease the load.
The acceleration/deceleration times or cycle times are
too short.
•
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]
.
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]
. Decrease the
values set in
E1-08 [Mid Point A Voltage]
and
E1-10 [Minimum
Output Voltage]
. For motor 2, adjust
E3-04 to E3-10
.
Note:
If the values set in
E1-08
and
E1-10
are 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]
.
