D9124 Operation & Installation Manual
Page 61
© 1995- 1996 Radionics
74-06799-000-D 2/96
J5
J8
XFRM
F1
TO DEDICATED
CIRCUIT BREAKER
DANGER!
120 VAC
H O T N E U T G N D
1
2
3
Figure 22: 120 VAC Power and Fuse
120 VAC Fuse
Fuse F1 protects the D9142, D1601, and D9112LTB from damage due to power surges
or over loads. If Fuse F1 is removed or is blown, AC Power is removed from both the
D9112LTB and the D9142 Power Supply. Fuse F1 is a type 3 AG, 4 Amp, 250V slow
blow fuse. Radionics part number 57-01338-004.
Safety Precautions While Handling High Voltage
Danger! High voltage is present at the AC Power input terminals and at Fuse F1 near
the lower right corner of the D9142 Power Supply. Always use the dedicated circuit
breaker to remove 120 VAC before removing the covers to the fuse or terminals block.
Always cover the terminals and Fuse F1 after making connections or testing these
connections. All connections to the 120 VAC
terminals should be performed as directed by
NEC 70.
Testing or Replacing Fuse F1
The 120 VAC fuse (F1) is located on
the lower right-hand corner of the
D9142, above the 120 VAC
terminals (see
Figure 22).
If the green AC power LED is
extinguished, the 120 VAC
circuit breaker is in the ON
position, and the building
lights and other electrical
devices still operate, Fuse F1
may be open. To replace the
fuse, follow these steps:
1.
Turn OFF the 120 VAC
facility circuit breaker.
2.
Remove the protective
cover from Fuse F1.
3.
Pull the fuse from the
socket.
4.
Using a Volt/Ohm meter, test the resistance of the fuse. If the fuse measures open it
is bad. Replace it with a new fuse matching Fuse F1’s specification. If the fuse is
measures shorted, it is good. The problem may be elsewhere. Call a licensed
electrician to troubleshoot any electrical problem.
5.
Insert the fuse into the F1 socket.
6.
ALWAYS REPLACE THE PROTECTIVE COVER.
7.
Turn the 120 VAC circuit breaker ON.
8.
Observe the green AC power LED, it should be illuminated.
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