YASKAWA ELECTRIC
SIEP C710617 19A YASKAWA AC Drive CR700 Technical Manual
333
oH4
Motor Overheat Fault (PTC
Input)
The motor has overheated.
•
Examine the load level, acceleration/deceleration
times, and motor start/stop frequency (cycle
time).
•
Decrease the load.
•
Increase the values set in
C1-01 to C1-08
[Acceleration/Deceleration Time]
.
•
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-xx [V/f Pattern for Motor
2]
settings. For motor 3, adjust
E7-xx [V/f
Pattern for Motor 3]
settings. Decrease the
values set in
Ex-08 [Mid Point A Voltage]
and
Ex-10 [Minimum Output Voltage]
.
Note:
If
Ex-08
and
Ex-10
are set too low, the overload
tolerance will decrease at low speeds.
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.