APC DCM00K04W481 Datasheet download pdf (Page 29)

User Manual 990-9189A

DC MX06 60A Shelf Page 29 of 30 18

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7 Fault Finding / Symptoms

The power system is designed for maximum reliability and therefore faults during normal operation are

unlikely. If faulty operation does occur the source of the failure can usually be readily determined by

inspection of the LED’s and or the system alarms.

7.1 Warnings

POTENTIALLY LETHAL VOLTAGES AND SOURCES OF HIGH ENERGY ARE PRESENT WITHIN

THE POWER SYSTEM. EXTREME CAUTION MUST BE OBSERVED AT ALL TIMES. ACCESS TO

THE INTERIOR OF THE SYSTEM FOR INSTALLATION, COMMISSIONING, MAINTENANCE AND

REMOVAL AND REPLACEMENT PURPOSES IS LIMITED TO FULLY TRAINED SERVICE

PERSONNEL ONLY.

RINGS, WATCHES AND JEWELLERY SHOULD BE REMOVED AND ONLY SINGLE ENDED

INSULATED TOOLS SHOULD BE USED WHEN WORKING OR MAKING MEASUREMENTS INSIDE

THE SYSTEM. A SOLDERING IRON MUST NOT BE USED UNLESS THE INPUT, OUTPUT AND

BATTERY (IF CONNECTED) HAVE FIRST BEEN ISOLATED.

7.2 Fault Symptoms

Typical fault symptoms and their possible causes are shown in table below. If the fault cannot be

diagnosed contact the manufacturer.

SYMPTOM POSSIBLE CAUSE(S)

Output voltage is zero at load

1. Failure of AC supply.

2. Failure of external disconnect device.

All Rectifiers Input Healthy LED’s are lit but

system output voltage is still zero before any

disconnection devices.

1. Rectifiers have tripped due to over-voltage. Remove

rectifier(s) temporarily (20 seconds) to reset condition

2. System output not enabled, could be set to remote

enable instead of local enable. (see section 2.4.2)

One or more rectifiers output healthy LED is

extinguished temporarily or Rectifier Fail LED lit

temporarily (single LED version).

1. Rectifiers tripping due to over temperature condition,

(Local ambient may be above rated level).

One or more rectifiers output healthy LED

extinguished permanently or Rectifier Fail LED

lit permanently.

1. System in overload condition (check system load or

Rectifier current limit LED’s if fitted).

2. System tripped due to over-voltage condition (check

rectifier over-voltage LED’s if fitted).

System not capable of supplying expected

current levels.

1. One or more rectifiers have tripped due to over temp

condition.

2. System set to current limit “Low” instead of “High”

(see section 2.4.1).

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APC DCM00K04W481 Datasheet Page 29

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