EP Equipment CQD16, Service Manual

Page: 128 / 251

REV. 07/2016
ELECTRICAL SYSYTEM
8
114
8.5.3 Faults and Causes
1
Fault
The mast is not lifted, but the instr-
ument reading of height is not 0
Cause Reset switch or its circuit failure
Reset Switch (RVF/NRVF)
1
Fault
When speed reduction switch is
activated, the speed is not reduced
Cause
Speed reduction switch is not reset
and always in a closed state.
Lifting Speed Reduction Switch
Checking
-
-
-
-
Enter TESTER Menu to check if each limit
switch is working properly; (see Section 8.12)
Turn the key switch to "OFF", remove key;
pull out the battery plug and switch off the
power supply.
Check the ON/OFF normally-open (NO)
terminal with a multimeter: with handwheel
at natural position, Terminal (3) and (4) not
conducted; toggle the handwheel, Terminal (3)
and (4) conducted.
Check the ON/OFF normally closed (NC)
terminal with a multimeter: with handwheel
at natural position, Terminal (1) and (2)
conducted; toggle the handwheel, Terminal (1)
and (2) not conducted.
-
-
Check the limit switch for damage and check
the roller for deformation;
Check if the handwheel is working smoothly
and if there is foreign body blockage.
Testing
8.5.4 Checking and Testing
8.5.5 Control Circuit Troubleshooting
Reset Switch Control Circuit
(Figure 90514)
Check if the circuit is broken by using a multi-
meter:
-
- Set the multimeter to ON-OFF;
Check if #57/#87 circuit (circuit between
reset switch and solenoid valve controller) is
conducted.