Manual

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
NCCOM
3231
DO1
NCCOM
1211
49484746454443
29282726
SV-COM SV-CH4SV-CH3
SV-CH2SV-CH1
DO-CH4
NONCCOM
424140
DO-CH3
NONCCOM
393837
DO-CH2
NONCCOM
363534
NO
33
DO5
NONCCOM
252423
DO4
NONCCOM
222120
DO3
NONCCOM
191817
DO2
NONCCOM
161514
NO
13
5857565554535251
HTR4HTR3HTR2HTR1
FUSE
HTR2HTR2
FUSEFUSE
HTR1HTR1
FUSE FUSE
HTR4HTR4
FUSEFUSE
HTR3HTR3
FUSE
250V T2.5A X 8
250V T2.5A X 8
FUSE
HTR7 HTR7
FUSE FUSE
HTR8 HTR8
FUSEFUSE
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
68676665 69 70 71 72
NONCCOMNONCCOM
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.