Operating instructions

ManualsBrandsSens ManualsBattery ChargerFC

FC Operation & Maintenance Guide (20 & 25 Amp)

(# cells), charge fail alarm voltage (10) 13.7 (19) 26.0 (25) 34.5

(20) 27.0 (27) 37.0

Charger

Trouble-

shooting

6.1 SENS Repair Policy

SENS’s policy is to help field technicians correct problems as fast and inexpensively as

possible. Please do not hesitate to call SENS; toll-free number to obtain assistance in

troubleshooting our chargers. Calling us will save you time and trouble.

6.2 Troubleshooting Table

This troubleshooting guide is provided for users experienced with power conversion

equipment. If you are unsure how to proceed, or factory service assistance, contact SENS

Symptom

• No output

• AC breaker only

trips

• AC and DC

breakers trip

• Current higher

than normal

• Improper

regulation

Possible Cause

• AC breaker tripped

• DC breaker tripped

• No AC power

• Defective transformer

• Defective SCRs

• Defective control circuit

• Defective filter inductor

• Defective rectifier diode(s)

• Defective SCR(s)

• Defective rectifier diode(s)

• Defective transformer

• Defective SCR(s)

• Defective rectifier diode(s)

• Shunt (R1) shorted

• Defective control circuit

• Defective SCR

• Defective control circuit

• Defective filter inductor

Test

Check breaker

Check voltage

Test #1

Test #4

Test #5

Test #2

Test #3

Test #4

Test #3

Test #1

Test #4

Test #3

Test #6

Test #5

Test #4

Test #5

Test #2

Repair Procedure

Reset breaker

Restore AC power

Replace

6.3 Component Diagnostic Tests

Test #1: With transformer leads disconnected, energize the transformer with the normal AC supply

voltage. Measure entire secondary voltage. It should be 1.5 to 2 times the nominal

battery voltage.