8.5.2 Parts Replacement
Some relay board parts have defined life spans or need to be replaced.
• Do not put any tool into the relay board during maintenance so as to prevent electric
shock or other abnormalities.
•
Do not insert or remove fuses while voltage is applied or current is conducted to terminals
so as to prevent electric shock. If it is necessary to insert or remove, user should contact
the service department of Yokogawa.
n
Parts Having Defined Life Spans
The following table shows the parts with defined life span used on the relay board.
Table 8.5.2-1 Parts Having Defined Life Spans
Model Part name Part number Life span
SRM53D
SRM54D
Relay A1772MR 100000 Times ON/OFF
SBM54D Relay A1589MR 100000 Times ON/OFF
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Replacement Parts
The following table shows the replacement parts used on the relay boards.
Table 8.5.2-2 List of Relay Board Replacement Parts
Model Part name Part number Remarks
SRM53D
SRM54D
Fuse A1327EF 125 V/0.3 A, 16
SBM54D Fuse A1603EF 250 V/10 A, 2
SEE
ALSO
For more information about replacing fuses in SBM54D, refer to:
“n Replacing Fuses” on page 7-40
n
Dismounting Cable T
rays
Each 19-inch rack mountable relay board comes with a cable tray where the wiring to the field
equipment can be stored.
If the cable tray is not necessary, it can be dismounted according to the following procedure.
1. Locate the three square-holes in the cable tray. Loosen the screws in the square holes
using a screwdriver in all three places.
2. Lift the cable tray approximately 5 mm up while the screws are still loosened.
3. The relay board and cable tray can be separated.
<8.5 Maintenance > 8-23
IM 32Q06C10-31E 4th Edition : Jan.30,2015-00
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