Document no.:
S-4-007.875/E
Prepared: 2002-10-01
BM
Revision:
R5 2004-04-07 BM
©
2002, Consilium Marine AB
Service manual
Appendix C: Fault codes C-14
CS3000
188
LOST CAPABILITY TO DETECT EARTH FAULT
Cause
Remedy
Hardware fault.
Exchange the unit.
Cable break
No answer from any loop unit
•
The cable is broken before the first loop unit on a single ended loop.
•
The cable is broken before the first loop unit at least once and it is also
broken after the last loop unit, if the loop is a double ended loop.
Loop units are answering
•
Look for the last loop unit answering on each side of the loop. The cable
break is situated after or between these units.
Earth fault
•
Check the earth fault circuit, change it if it is faulty.
•
If the circuit is working properly, check the loops one by one.
•
Disconnect the loops one by one, see Disconnection, Electric isolation of a
loop.
Short circuit
No answer from any loop unit
•
Search for the short circuit between the central unit and the short circuit
isolator.
Loop units are answering
•
Search for the short circuit between the short circuits reporting the faults.
Proceed as follows to locate an earth fault. Divide the cable in two halves and locate
the earth fault on one of the halves. Thereafter divide this part of the cable into two
halves. Continue dividing the cable into halves until the earth fault has been found. If
you are using a multimeter use the diode tester range.
