Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
8.4 FUSE REPLACEMENT
CAUTION
1. Never attempt to remove or replace a fuse with the Main or Redundant
Power Supply Modules energized; component damage may result.
2. For continued safe operation, always replace a fuse with one having the
correct voltage and current ratings.
The M-DACS input fuses are located on the rear panel of the Power Supply Alarm I/O Module. Each
Power Supply Alarm I/O Module has two input fuses.
To check the fuses in a M-DACS power supply, proceed as follows:
1. On the rear panel of the Power Supply Alarm I/O Module, place the MAIN POWER switch
and the REDUNDANT POWER switch to the OFF position.
2. Using a flat-blade screwdriver, remove the F1 and F2 fuse caps by turning the caps counter
clockwise. Remove the fusecaps and inspect the fuses for damage. The fuses should be checked
visually and should also be checked for continuity.
If the fuse is bad, it must be replaced. If the fuse is good, check for presence of
input voltage at terminal blocks TB1-9 and TB1-10 on the Power Supply I/O
Module. If voltage is present and the power supply module does not function, the
power supply module is defective and must be replaced.
3. Insert a fuse with the proper voltage and current ratings into the fusecap, and install the fusecap
in its correct location.
Fuse replacement data for the 48/125 Vdc supply is as follows:
Input Fuses F1 and F2:
3AG slow-blow, 3A, 250V; Littelfuse 313003 or equiv.
(RFL P/N 6607)
10-Volt Output Fuse F3:
3AG normal-blow, 1/4A, 250V; Littelfuse 312250 or equiv.
(RFL P/N 91967)
Fuse replacement data for the 38-150 Vdc wide-range supply is as follows:
Input Fuse F1 :
2A, 250V, slo-blo, 5x20mm; Littelfuse 218002 or equiv.
(RFL P/N 103389)
M-DACS-T1 RFL Electro
nics Inc.
October 25, 2004 8-17 (973) 334-3100
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