5.2Troubleshooting

Table 39 provides a list of the problems that may occur on the Helios DC System 4000/48, along with their possible causes. Blown fuses and tripped circuit breakers should always be investi- gated before utilizing Table 39.

Table 39 Fault diagnosis

Fault symptom

Possible causes

 

 

No DC output current

Open AC circuit breaker

 

Open DC circuit breaker

 

Faulty connection between the power shelf and the rectifier (Helios

 

Rectifier 100/48)

 

Faulty connection between the rectifier and the power plant

 

Sense leads opened

 

 

Incorrect indication of the DC

Incorrect meter calibration

output current

Loose shunt leads connection

 

 

Low float voltage

Faulty rectifier(s)

 

Shorted battery cell(s)

 

Prolonged power failure

 

Incorrect float voltage adjustment

 

Sense leads opened

 

 

Low recharge voltage

Incorrect float voltage adjustment

 

Discharge load greater than the rectifier’s capacity (batteries are

 

recharging or the system is in manual bypass)

 

Sense leads opened

 

 

High float or recharge voltage

Faulty rectifier(s)

 

Incorrect Float/Equalize adjustment

 

 

Failure to generate alarms

Incorrect connections between the controller and the rectifiers and

during alarm conditions

distribution panels

 

 

Failure to generate cabinet

Faulty LP fuse on the controller (F31)

alarm during minor or major

Faulty cabinet alarm lamp

alarm conditions

Faulty or loose connection

 

 

 

Failure to generate RFA alarm

Faulty rectifier

under appropriate conditions

Faulty wiring

 

Faulty RFA LED

 

 

Failure to generate FA alarm

Faulty wiring

 

Faulty fuse

 

Faulty FA LED

 

Loose connection

 

 

HV lamp lit

High discharge voltage condition

 

Incorrect HV level adjustment

 

 

LV lamp lit

Low discharge voltage condition

 

Incorrect LV level adjustment

 

 

HF lamp lit

High discharge voltage condition

 

Incorrect HF level adjustment

 

 

LF lamp lit

Low discharge voltage condition

 

Incorrect LF level adjustment

 

 

FA lamp lit

Blown fuse or extended FA alarm

 

 

CFA lamp lit

Blown charge fuse

 

 

DFA lamp lit

Blown distribution fuse

 

 

RECT MIN lamp lit

One rectifier has failed

 

 

RECT MAJ lamp lit

Two or more rectifiers have failed

 

 

RECT FAN lamp lit

Defective rectifier fan(s)

 

 

Maintenance 39

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Liebert 4000, 3000, 6000 A, 1500 user manual Troubleshooting, Fault diagnosis

1500, 6000 A, 4000, 3000 specifications

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