5.3
FUSE REPLACEMENT
CAUTION
NEVER ATTEMPT TO REMOVE OR REPLACE A FUSE WITH THE POWER
SUPPLY MODULE ENERGIZED, SINCE COMPONENT DAMAGE MAY RESULT.
The input fuse for RFL 9785 power supply I/O module is located on the rear of the power supply I/O
module. The fuse can be changed without removing the power supply I/O module from the chassis. To
check and/or replace the fuse, proceed as follows:
1.
Place the POWER switch on the power supply I/O module to the OFF position.
2.
Remove the input fuse from its fuseholder by pushing in on the fuseholder cap and turning it
counter clockwise about 1/4 turn. Some fuseholders require a screwdriver to remove the fuse,
while others can be turned with the fingers.
3.
Remove the fuse from the fuseholder cap and inspect it for damage. If the fuse is bad, it must
be replaced. If the fuse is good, check for the presence of input voltage across TB1-1 and TB1-
2 on the rear panel. If voltage is present and the power supply does not function, troubleshoot
the supply to determine the cause of failure.
4.
Insert a fuse with the proper voltage and current ratings into the fuseholder cap and push it in
until it is firmly seated. Using a flat-blade screwdriver, push in on the cap and turn clockwise
about one quarter-turn. This will secure the fuse in place.
For continued safe operation, always replace a fuse with one having the same
voltage and current ratings. Refer to Table 5-1 or Section 17 for proper fuse
replacements.
5.
Once the fuse has been checked and/or replaced, place the power switch to the ON position.
If the green power indicator of the front of the power supply lights, the power supply module is
working properly. If the indicator does not light or if the fuse blows again, troubleshoot the
power supply module.
Table 5-1. Fuse replacement data, RFL 9785 Power Supply I/O Modules
Model
Assembly Number
Fuse Rating
Manufacturers type
RFL Part Number
48/125Vdc
106455-1
5x20mm, slo-blow, 250V, 4A
Littlefuse 218004 or equiv.
301122
250Vdc
106455-2
5x20mm, slo-blow, 250V, 4A
Littlefuse 218004 or equiv.
301122
48/125Vdc, dual
106455-3
5x20mm, slo-blow, 250V, 4A
Littlefuse 218004 or equiv.
301122
250Vdc, dual
106455-4
5x20mm, slo-blow, 250V, 4A
Littlefuse 218004 or equiv.
301122
RFL 9785
RFL Electronics Inc.
April 25, 2005
5-5
(973) 334-3100