Yokogawa Multi Channel Oxygen Analyzer System ZR22/AV550G - 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
<How to replace the fuse>
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.