EP Equipment CQD16, Service Manual

Page: 147 / 251

REV. 07/2016
ELECTRICAL SYSYTEM
8
133
8.14 Controller Error Message
Electrical faults are mainly caused by electrical
components failure or electrical circuit failure.
Wherein, when some components failures
which may not affect the ON/OFF of control
circuit occur, the instrument won't display fault
code (see Chapter 9 - Troubleshooting); while
the when the components failures which may
affect the ON/OFF of control circuit occur to
the electrical circuit, the controller will alarm for
error, and fault information will be displayed on
the instrument.
8.14.1 Tractiong/Pump Controller
Error Message
Possible cause Fault elimination
WATCH DOG
The test is made in both running and
standby. It is a self-diagnosing test within
the logic.
If an alarm should occur, replace the
logic.
EEPROM KO
Fault in the area of memory in which the
adjustment parameters are stored;this
alarm inhibits machine operation.
If the defect persists when the key is
switched OFF and ON again, replace
the logic. If the alarm disappears,
remember that the parameters stored
previously have been cancelled and
replaced by the default values.
LOGIC FAILURE #1
This alarm signals that an undervoltage
/ overvoltage protection operation has
occurred.Two possible reasons:
A) A real undervoltage / overvoltage
situation happened.
B) Fault in the hardware section of
the logic board which manages the
overvoltage protection.
Replace the logic card.
LOGIC FAILURE #2
Fault in the hardware section of the
logic board which manages the phase' s
voltage feedback.
Replace the logic board.
LOGIC FAILURE #3
Fault in the hardware section of the logic
board which manages the hardware
current protection.
Replace the logic board.
INCORRECT
START
This alarm signals an incorrect starting
sequence. Possible causes:
A) running microswitch failure;
B) error in sequence made by the
operator;
C) incorrect wiring;
if the default persists, replace the logic.
FORW + BACK
The test is carried out continuously. An
alarm is signalled when a double running
request is made simultaneously. Possible
causes:
A) defective wiring;
B) running microswitch failure;
C) incorrect operation;
if the default persists, replace the logic.