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Connecting Power
The GranDSLAM chassis is furnished with two internally mounted, 35-amp circuit
breakers for redundant power (PWR A and PWR B). Two separate, unswitched,
individually fused power sources, each capable of safely handling this load, are
required for power redundancy.
The chassis provides either front or rear power access connections. Rear power
access is recommended due to ease of installation. Selecting the rear power
access method also eliminates the need for routing large 8-gauge wires to the
PEMs on the front of the chassis. The PEMs contain the 35-amp circuit breakers,
isolation, and other power conditioning-type circuitry and are always required for
operation, even if rear power access wiring is installed.
Front Power Access
Front power access is made via two PEMs which are located in the front, lower left
side of the chassis. PEM A is located on the left, while PEM B is on the right.
The 48 VDC power wiring requires the use of #8 AWG stranded wires. Use the
following procedure to connect power to the front.
8820-A2-GN20-30
!
WARNING:
While power connections can be made to either the front or the rear of
the chassis, they must not be made to both at the same time.
NOTE:
Both PEMs must be powered, or else the MCP alarm will activate.
POWER ENTRY MODULE
LEFT UNIT: LINE A
CLOCK
POWER ENTRY MODULE
SERIAL
AC
RIGHT UNIT: LINE B
A
MCC
LEFT UNIT: LINE A
ALARM
LAN/WAN SLOT
RIGHT UNIT: LINE B
2
4
6
8
A
10
WARNING!
POWER MUST BE DISCONNECTED
BEFORE REMOVING OR INSTALLING
AT THE SOURCE
WARNING!
THIS PWR ENTRY MODULE
POWER MUST BE DISCONNECTED
BEFORE REMOVING OR INSTALLING
AT THE SOURCE
THIS PWR ENTRY MODULE
B
SERIAL
ALARM
CLOCK
1
3
SMCM
5
7
9
B
PEM
PEM
A
B
PEM
Circuit
Breaker
WARNING!
BEFORE REMOVING OR INSTALLING THIS PWR ENTRY MODULE
March 2001
12
14
16
18
11
13
15
17
POWER ENTRY MODULE
LEFT UNIT: LINE A
RIGHT UNIT: LINE B
O
POWER MUST BE DISCONNECTED AT THE SOURCE
2. Installation
00-15326a-02
2-11
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