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Text artwork 990-9030 Rev. A. Equipment Handbook for the Low Voltage Disconnectors series Page 13 of 20
FUSE FAILURE
4 Fuse failure should be suspected when one or more of the following typical symptoms are observed:
SYMPTOM
FUSE
Contactor is disconnected at normal operating voltage. FS1.
LVD PCA LED is extinguished at normal operating voltage. FS2.
FUSE REMOVAL AND REPLACEMENT
5 Where possible, attempt to ascertain the reason for the fuse failure and correct the fault before
replacing. The most likely cause is a short circuit on the relevant line.
FS1 removal and replacement
Caution
This procedure requires the system to be powered down.
6 To remove and replace FS1, proceed as follows:
6.1 Switch off and isolate the external power system and check that the contactor is de-
energised.
6.2 Disconnect the output cable at the battery end and wrap with two layers of insulating tape.
6.3 Open the door, remove five screws and washers on the plastic plate and lift off the plate.
6.4 Remove two nuts and washers from the fuse and lift off the fuse.
6.5 Fit a replacement fuse and secure using two nuts and washers.
6.6 Refit the plastic plate using five screws and washers and close the door.
6.7 Remove the insulating tape from the output cable and connect to the battery negative
terminal.
6.8 Power up the system as detailed in Section 5 Para 8.
FS2 removal and replacement
Caution
This procedure may be carried out without power down of the system, providing that suitable care is
taken.
7 To remove and replace FS2, proceed as follows:
7.1 Pull out the fuseholder from the bracket and remove the fuse from the fuseholder.
7.2 Fit a replacement fuse into the fuseholder and push the fuseholder into the bracket.