2 procedure for performing an indication check, 1 fuse replacement, Fuse holder (8 holders in basic power supply unit) – Yokogawa Multi Channel Oxygen Analyzer System ZR22/AV550G User Manual
Page 206

IM 11M12D01-01E
11-12
11.4 Inspection and Maintenance of the Averaging Con-
verter
The averaging converter does not require routine inspection and maintenance. This
section describes inspections performed at the time of periodic maintenance service, part
replacement, and addition of channel cards.
11.4.1
Fuse Replacement
The averaging converter has fuses for detector heaters of channels CH1 to CH4 in the
basic power supply unit and fuses for detector heaters of channels CH5 to CH8 in the
expansion power supply unit. Fuses are inserted in both poles of the heater of each
channel. When the fuse blows out, follow the procedure below to replace it.
DO-CH1
NC
COM
32
31
DO1
NC
COM
12
11
49
48
47
46
45
44
43
29
28
27
26
SV-COM
SV-CH4
SV-CH3
SV-CH2
SV-CH1
DO-CH4
NO
NC
COM
42
41
40
DO-CH3
NO
NC
COM
39
38
37
DO-CH2
NO
NC
COM
36
35
34
NO
33
DO5
NO
NC
COM
25
24
23
DO4
NO
NC
COM
22
21
20
DO3
NO
NC
COM
19
18
17
DO2
NO
NC
COM
16
15
14
NO
13
58
57
56
55
54
53
52
51
HTR4
HTR3
HTR2
HTR1
FUSE
HTR2
HTR2
FUSE
FUSE
HTR1
HTR1
FUSE
FUSE
HTR4
HTR4
FUSE
FUSE
HTR3
HTR3
FUSE
250V T2.5A X 8
250V T2.5A X 8
FUSE
HTR7
HTR7
FUSE
FUSE
HTR8
HTR8
FUSE
FUSE
HTR5
HTR5
FUSE
FUSE
HTR6
HTR6
FUSE
HTR5
HTR6
HTR7
HTR8
101
102
103
104
105
106
107
108
81
82
83
COM
NC
NO
DO-CH5
84
85
86
COM
NC
NO
DO-CH6
87
88
89
DO-CH7
90
91
92
DO-CH8
SV-CH5
SV-CH6
61
62
63
64
SV-CH7
SV-CH8
68
67
66
65
69
70
71
72
NO
NC
COM
NO
NC
COM
Fuse Holder
(8 holders in basic power supply unit)
F11.8Eeps
Fuse Holder
(8 holders in expansion power supply unit)
Fig11.8
1) Before replacement, turn off the power to the averaging converter at the external
breaker.
2) Remove the front cover, and position the power switch to "O (OFF)."
3) Remove the fuse from its holder. Using an appropriate size flat blade screwdriver,
turn the fuse holder cap counterclockwise until it stops. Pull out the cap. The fuse
will come out together with the cap.
4) Use a recommended fuse, shown below, or equivalent for replacement. Attach a new
fuse to the cap, place in the fuse holder, and push and turn the cap clockwise until it
stops with the flat blade screwdriver.
Fuses used in the averaging converter are as follows.
Maximum rated voltage: 250 V
Maximum rated current: 2.5 A
Type:
Time lag fuse
Compliance:UL, CSA, VDE, Japan's Electrical Appliance and Material Safety Law
Part number:A1112EF
5) It is recommended that the fuse be replaced every two years even if it has not blown.
6) Position the power switch to "I (ON)", and attach the front cover.