EP Equipment CQD16, Service Manual

Page: 58 / 251

44
REV. 07/2016
DRIVE SYSTEM
5
Adjustment
The electromagnetic brake used in this series of
truck is an air gap adjustment-free brake. After
the normal installation is completed, the air gap
between electromagnetic coils and pressure
plate should be standard gap distance.
As shown in the following table:
Installation
- Install according to the reverse order of rem-
oval;
When installing the brake gear (7), make sure
the flat key is installed on the shaft of drive
motor (8).
CAUTION
Air gap Standard value Maximum value
s 0.2 mm 0.4 mm
When the air gap s exceeds 0.4mm, replace the
brake pads (2, Figure 50205)
CAUTION
2
Fault
After the coil is powered off, the
pressure plate won't release
Cause Foreign body blocking
3
Fault Abnormal noise after absorption
Cause
a. Fully absorbed, but plate not
fl at.
b. Mechanical resistance
4
Fault Brake temperature is too high
Cause
Pressure plate does not fully
absorb, overcurrent of the coil, or
energized too frequently
5.2.3 Checking and Testing
Electromagnetic Coil Checks
-
-
Switch off the truck power connections and
pull out the brake connectors;
Check the resistance of the coil with a multi-
meter: measurement method is as shown in
Figure 50209;
5.2.2 Faults and Causes
1
Fault
After the coil is energized, the
pressure plate does not absorb
Cause
a. Mechanical part failure;
b. Foreign body blocking;
c. Coil failure;
d. Coil supply voltage less than
24V
- Identify if the electromagnetic coil is normal
according to the readings of resistance on the
multimeter.
As shown in the following table:
Resistance
Measurement
Judgment
Approx. 30 Ω Normal
0 Ω
Coil shorting
(replace the brake)
∞ Ω
Coil breaking
(replace the brake)