Preliminary Troubleshooting; Table 6-1 Fuses And Circuit Breaker - Siemens L-828 Manual

L-828 CCRs LC-Type (4, 7.5, and 10 kW/6.6 A/60 Hz)
2. Preliminary
Troubleshooting
Circuit Breaker/Fuses
Circuit Breaker CB1
Fuse F1, F2
Fuse F3
Fuse F4
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The following is a check list of initial steps to perform.
•
Check all LED indicators, fuses and circuit breakers. Refer to
Table 6-1.
•
Visually examine all areas of the CCR. Do burnt or loose
connections/parts exist?
•
Is the input voltage present and within +10 to –5% of nominal?
•
Check all the fuses.
•
Are the wire harness connectors to the control board fully
seated?
•
Have the PCBs been adjusted in accordance with the instruction
manual?
•
If the CCR works in local but not Remote, check the voltage on
the Remote control lines.
•
Can the CCR be re-energized by turning the rotary switch from
OFF to Step B1 (B10)?
•
Short the output of the CCR with an AWG 8 wire, and turn on the
CCR. If the regulator operates normally, the problem is probably
load related.
•
If the CCR turns on and then shuts off after a few seconds and
the ammeter has a high current reading, the problem is
overcurrent. Adjust the output current accordingly. If the output
current is not adjustable, replace the control board restart the
regulator.
•
If the CCR still fails in overcurrent, replace the SCR and restart.

Table 6-1 Fuses and Circuit Breaker

Description
1 A, Slo-Blo for 480 V CCRs
2 A, Slo-Blo for 208, 220, &
240 V CCRs
¼ A, 250 V, Slo-Blo
¼ A, 250 V, Slo-Blo
Protects K1 (contacts), SCR1, L1, L2, and main
transformer T1
Protects transformers T3 and T4, contactor K1 (coil),
triac Q21 and DC power supplies on Control PCB
Protects internal 120 Vac CCI source and transformer
T6
Protects the internal +48 Vdc (on Control PCB) CCI
source circuitry on the Control PCB
96A0104B
Issued 6/02
Troubleshooting
Function
Page 6-2