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Page 12 of 20 Text artwork 990-9030 Rev. A. Equipment Handbook for the Low Voltage Disconnectors series
SECTION 7: FAULT DIAGNOSIS AND REPAIR
GENERAL
1 The units are designed for maximum reliability, therefore faults during normal use are unlikely. If faulty
operation does occur, the source of the failure can usually be readily determined by inspection of the
LED on the LVD PCA and the status of the contactor.
WARNINGS
(1) EXERCISE EXTREME CAUTION WHEN WORKING OR MAKING MEASUREMENTS WITHIN THE UNITS.
HIGH VALUE DC VOLTAGES MAY PRESENT A HAZARD OWING TO THE DANGER OF SHORT
CIRCUITS. RINGS, WATCHES AND JEWELLERY SHOULD BE REMOVED AND ONLY INSULATED
TOOLS SHOULD BE USED. A SOLDERING IRON SHOULD NOT BE USED UNLESS THE INPUT AND
OUTPUT HAVE FIRST BEEN ISOLATED.
(2) THESE UNITS USE POSITIVE EARTH. CAREFULLY OBSERVE CORRECT POLARITY WHEN
CONNECTING THE UNITS.
(3) REFER TO MANUAL HANDLING, SECTION 8, BEFORE ATTEMPTING TO MOVE OR LIFT THE UNITS.
MAINTENANCE SPARES
2 It is recommended that a set of maintenance spares is held by the maintenance engineer, as detailed
below:
CIRCUIT APC BS PART RECOMMENDED
CODE
DESCRIPTION NUMBER NUMBER QUANTITY
BC1 Contactor 451-9005 503770 1
FS1 Fuse, 600A (15000218) 515-0600 503772 1
Fuse, 300A (15000248) 515-0302 503773 1
Fuse, 1000A (15000264) 515-1001 503802 1
Fuse, 400A (15000408) 515-0400 505300 1
Fuse, 500A (15000409) 515-0500 505301 1
FS2 Fuse, 2A 516-9116 502739 1
- LVD PCA 0P9445 524792 1
FIELD REPLACEABLE UNITS
3 In addition to the maintenance spares, the following components may be replaced on site should they
become faulty:
CIRCUIT APC BS PART RECOMMENDED
CODE
DESCRIPTION NUMBER NUMBER QUANTITY
FS1 Fuse, 600A (15000218) 515-0600 503772 1
Fuse, 300A (15000248) 515-0302 503773 1
Fuse, 1000A (15000264) 515-1001 503802 1
Fuse, 400A (15000408) 515-0400 505300 1
Fuse, 500A (15000409) 515-0500 505301 1
FS2 Fuse, 2A 516-9116 502739 1