Emerson NetSure 721NPBB - Page 32

NetSure
™
-48V DC Power System
User Instructions, UM582127000 (Issue AD, January 20, 2014)
Spec. No: 582127000 Code: UM582127000
Model No: 721NPBB Issue AD, January 20, 2014
[24]
5. Close the fuse case.
6. Push the fuse case securely back into the mounted fuse
block.
7. Replace the alarm fuse located in the front of the TPL-B
fuse block. Replace only with a fuse of the same type and
rating. Ensure that a plastic safety cover is installed on
the alarm fuse.
8. Close the distribution cabinet’s front door. Turn the latch
clockwise to secure the door.
Figure 16. Replacing a TPL-B Fuse
Replacing a GJ/218 Circuit Breaker
PROCEDURE
Note:
Refer to Figure 17, Figure 18, and Figure 19 as this procedure is
performed.
1. Open the distribution cabinet’s front door by turning the
latch in the counterclockwise position.
2. Operate the defective circuit breaker to the OFF position.
Danger!
The bolts being removed in the following step
may be at system potential. Use insulated tools.
3. Remove the hardware securing the circuit breaker to the
distribution panel and partially remove the circuit
breaker.
4. Record each alarm wire located on the back of the circuit
breaker (color and location on circuit breaker). Wiring
diagrams are provided in Figure 17, Figure 18, and Figure
19. Carefully disconnect the alarm wiring from the back
of the circuit breaker, ensuring the exposed end does not
contact any energized circuit.
5.
Shunted Breakers Only:
Record each shunt wire located
on the back of the circuit breaker (color and location on
circuit breaker). Wiring diagrams are provided in Figure
17, Figure 18, and Figure 19. Carefully disconnect the
shunt wiring from the back of the circuit breaker,
ensuring the exposed end does not contact any
energized circuit.
6. Ensure that the replacement circuit breaker is in the OFF
position, and is of the correct rating and type (electrical
Fu
se C
ase
Ope
n Fu
se Case V
iew
TPL Fuse
Fus
e Ins
tal
led
in
O
pen
Fuse
Cas
e
(rear view)
Fuse Installed in
Closed Fuse Case
(re
ar view)
Fusebl
ock
(P/N 516
241)
GMT-18/100
A A
la
r
m F
us
e
(P/N 24861030
1)
a
nd
GMT
-X S
afe
ty Fu
se C
ove
r
(P/
N 24
889
8700
)
(B
oth
are p
rov
ide
d
w/ f
use
blo
ck)
Da
nger