12
Amphenol Network Solutions
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509.926.6000 — amphenol-ns.com
High-Power GMT
Series Fuse Panel
c. Lightly coat antioxidant on lugs and input negative and positive terminals.
d. Connect the lugs to Feed A and B input terminals on back of the panel using
1
/
4
-20 KEPS nuts and
washers provided, as shown in Fig. 8.
e. Use a
7
/
16
-inch (12 mm) socket to tighten the lugs to 50 in/lb. (~5.5 N
•
m).
11. Make sure the power is off (open breaker, dummy fuse or vacant fuse holder at the power distribution unit, or
PDU) before connecting the panels’ cables to the PDU. See Warning below.
12. Make sure that only dummy GMT fuses are installed in the panel or that the GMT fuse holders are vacant.
WARNING! All inputs must be disconnected before servicing this unit.
CAUTION! For a panel with an input noise filter, reversing input cables between positive and negative
terminals could result in damage to the panel. Double check before proceeding to ensure that the NEG
and POS/RTN feeds from the PDU are cabled to the proper terminals.
13. Enable the fuse or breaker at PDU (90A or 125A max., with or without the noise filter feature, respectively) to
turn on Side A of the panel.
14. Check voltage and polarity
at the input connectors of the panel.
Also, check:
•
The
A POWER LED
on front of the panel turns on (green)
•
The
FAIL ALARM LED
turns green
•
The
B POWER LED
must remain red
•
On rear of the panel, with
A POWER
lit (normal operation) — but with
B POWER
LED off (failure
operation) — test power-fail relay:
•
Test across remote (R), visual (V) and audible (A) pins. When testing:
o
Expect an open circuit (
∞Ω
) between Terminals
C
and
NC
o
Expect continuity (0
Ω
) between Terminals
C
and
NO