EP Equipment CQD16, Service Manual

Page: 182 / 251

REV. 07/2016
TROUBLESHOOTING
9
168
9.2 Troubleshooting Solutions of Common Faults
Table 9.1 lists the common faults that may occur and handling
methods. Mainly consists of the following items:
Table 9.1 Troubleshooting of Common Faults
Fault Fault Symptom Troubleshooting Order * Troubleshooting Measures
Power supply
failure 1. Whole vehicle
power outrage a. Power supply failure
b. Fuse failure
c. Emergency stop switch or circuit
failure
d. Key switch or circuit failure 1. Check the voltage of storage
battery (see Section 9.1.1)
2. Check the fuses
(see Section 8.2)
3. Check key switch and its circuit
(see Section 6.7)
4. Check emergency stop switch
and its circuit (see Section 6.8)
Travel Fault 1. Forward and rever-
se moving failures of
the vehicle, but other
functions are normal a. Foot switch and seat switch or
its circuit connection failure
b. Electromagnetic brake locked
(Non-mechanical failure, the
instrument will display fault code)
c. Travel switch or its circuit
connection failure
d. Drive motor or its circuit
connection failure
e. Controller failure Controller failure error, carry out
troubleshooting according to the
fault code information on the
instrument (see Section 8.14).
1) Check if the foot switch and
seat switch or the connection of
its circuit is normal;(See Section
8.7 and Section 8.11)
2) Electromagnetic brake and its
connecting circuit;
(see Section 5.2)
3) Check the travel switch and its
connection circuit;
(see Section 6.10)
4) Check the drive motor and its
connection circuit;
(see Section 5.3)
5) Replace the controller.
2. The vehicle can
travel at low speed,
but cannot travel at
high speed Failures due to external factors:
a. Electromagnetic brake locked
(Non-mechanical failure, the
instrument will display fault code)
b. Motor bearing blocked
c. Gearbox bearing blocked
Failures due to internal factors:
a. Drive motor speed encoder
failure
b. Controller failure
Controller failure error, carry out
troubleshooting according to the
fault code information on the
instrument (see Section 8.14).
1) Check if the motor rotation is
normal;
2) Check the electromagnetic
brake or its connection circuit
(see Section 5.2)
3) Check the speed encoder and
its connection circuit;
(see Section 5.3)
4) Remove the gearbox, check if
the gear rotation is smooth and
if there is blocking;
(see Section 5.4)
5) Replace the controller
* Carry out trouble shooting in accordance with the order listed
in the table, it can help you quickly identify problems and
resolve accordingly.