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k. Overvoltage protection circuit
When each output (excluding –5.2V and –20V series) becomes an
overvoltage, the over voltage protection circuit of each output trans-
mits a signal through the photo coupler (PC702) to the primary side
control circuit, and the invertor operation is stopped by stopping the
switching operation of IC701, preventing each output voltage from
rising.
The operation is of latch system. After removing an overvoltage,
apply the AC power to reset.
R721
10K
PC702
TLP621
Fig.24
8
7
6
5
IC701
FA5314P
1
2
3
4
C717
0.01
R722
R723
12K
2.2K
R724
1K
l. Overheat protection circuit
The power unit is forcibly cooled by the cooling fan. In case of an
abnormally high temperature due to the fan trouble, the temperature
of the convertor transformer (T701) is detected by the temperature
fuse (F710) to stop the switching operation of the power.
To reset, remove the abnormality and replace the fuse.
Fig. 17 Overheat protection circuit
R725
4.7K
23.3VDC
D712
ERA 9102
C718
C719
100(PF)
47(PF)
Primary side
Secondary side
Fig. 16 Overvoltage protection circuit
R742
22K
C733
100P/50V
C734
R741
10K
0.47(HR)
IC702
UPC1093J
C722
1000P/1KV(HA) 2
C-L00-284
D718
RD47EB
C725
R733
22(3W)
2200(PF)
D719
1SS178
L714
B01A
C733
IC702
UPC1093J
D724 1SS178
D726 1SS178
9 – 27
F702
125V/5A
F703
250V/3A
C726
0.1/50V(PPE)
24V voltage adjustment
F704
250V/3A
R744
R742
F705
10(H)
22K
250V/3A
R745
F706
33K
250V/5A
F707
250V/3A
100P/50V
C734
R741
10K
0.47(HR)
C735
R746
0.1/50V(PPE)
D725
RD5.6ESAB2
2.7K
C
D727
RD5.6ESAB2
D
38V1
CN702-21
38V2
CN702-24
RE T
24V2
CN702-15,16,17
24V1
CN702-11,12,13,14
24V4
CN702-18,19
24V3
CN702-20,21
FW
CN703-17
Fig.21
RE T
CN702-1~10
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