EP Equipment CPD30L1-B, Service Manual

Page: 86 / 235

74
REV. 05/2020
HYDRAULIC SYSTEM
7
7.3.2 Faults and Causes
1
Fault Motor does not rotate
Cause
a. Cable U, V, or W is broken;
b. Loosening connections to cable
U, V or W ;
c. Stator coil open circuit;
d. Motor bearing damage;
e. Speed encoder or its circuit
failure.
2
Fault Motor is rotating in slow speed and
reverse
Cause Cable connection error
3
Fault Motor with abnormal noise or
vibration
Cause
a. Uneven clearance between
stator and rotor;
b. Bearing failures;
c. Loosening fixing screws on
motor housing.
4
Fault Motor smoking or burning smell
Cause Stator winding short circuit, motor
burnt
5
Fault Motor temperature too high,
controller failure
Cause
a. Stator winding short circuit;
b. Motor U, V and W terminals with
surface ;
c. Bearing failure, resulting in
severe heating;
d. Motor cooling duct blockage
with foreign body;
e. Overload.
6
Fault On load, motor speed is turning
slow
Cause
a. Insufficient voltage of battery;
b. Overload;
c. U, V, W terminals with abnormal
voltage input;
d. Speed encoder or its circuit
failure.
Speed Encoder
Removal
-
-
Switch off the truck power connections and
open the battery cover;
Unplug the AMP connector on the speed
encoder (2, Fig3131-40003SM);
- Unscrew the screw (1,Fig3131-40005SM)
from the drive motor and remove the speed
encoder (2).
Installation
- Install according to the reverse order of rem-
oval.
1 2
Fig3131-40005SM