L-828 CCRs LC-Type (4, 7.5, and 10 kW/6.6 A/60 Hz)

Troubleshooting

4.General Troubleshooting Procedures (contd.)

 

Problem

Possible Cause

Corrective Action

 

 

3. Regulator

Feedback transformer T2 or main

Turn control switch S1 to the OFF

 

 

repeatedly trips

transformer T1 failed

 

position. Reset circuit breaker CB1. While

 

 

circuit breaker CB1

 

 

observing the CCR’s output ammeter, turn

 

 

on Start-up.

 

 

on the CCR. If the meter moves, go to the

 

 

 

 

 

corrective action below. If the meter

 

 

 

 

 

does not move, replace feedback

 

 

 

 

 

transformer T2 or main transformer T1.

 

 

 

SCR1 shorted

 

With CB1 and control switch S1 off,

 

 

 

 

 

remove connector J4 by pulling it from

 

 

 

 

 

the PC board. Then turn on the circuit

 

 

 

 

 

breaker CB1 and control switch S1. If

 

 

 

 

 

circuit breaker CB1 still trips, replace

 

 

 

 

 

SCR1.

 

 

 

Control PCB failed

 

Replace Control PCB.

 

 

4. Regulator shuts

Faulty overcurrent protection

Test the operation of the overcurrent

 

 

down from

 

 

protection (red LED on). With the CCR

 

 

overcurrent

 

 

off, connect a jumper across TP7 to TP9

 

 

protection (red LED

 

 

(see Figure 8-1). Turn on the CCR to an

 

 

lit)

 

 

output of 6.6 A, and time how long it

 

 

 

 

 

takes for the overcurrent protection to

 

 

 

 

 

shut off the CCR. Green REGULATOR ON

 

 

 

 

 

LED will turn off when the overcurrent

 

 

 

 

 

circuitry operates. The time period will be

 

 

 

 

 

20 ±10 seconds from proper operation. If

 

 

 

 

 

the time period is less than 10 seconds or

 

 

 

 

 

more than 30 seconds, the CCR may be

 

 

 

 

 

improperly calibrated.

 

 

 

CCR not properly calibrated

With CB1 and control switch S1 off,

 

 

 

 

 

remove connector J4 by pulling it from

 

 

 

 

 

the Control PC board. Then turn on

 

 

 

 

 

circuit breaker CB1 and then control

 

 

 

 

 

switch S1.

 

 

 

SCR1 fails

 

Replace SCR1.

 

 

 

 

 

NOTE: SCR1 may have failed if

 

 

 

 

 

overcurrent indicator (red LED) does not

 

 

 

 

 

light.

 

 

 

Control PCB or SCR1 fails.

Replace SCR1 or Control PCB.

 

 

 

 

 

NOTE: SCR1 or Control PCB may have

 

 

 

 

 

failed if overcurrent indicator (red LED)

 

 

 

 

 

lights.

 

 

 

 

 

Continued on next page

 

 

 

 

 

 

 

2002 Siemens Airfield Solutions, Incorporated

96A0104B

Page 6-4

 

All rights reserved

 

Issued 6/02

 

 

Page 45
Image 45
Siemens L-828 manual General Troubleshooting Procedures contd

L-828 specifications

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