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Page 152 of 436
Installing a PFTU
Table 6
MDF cross-connections for PFTU operations
Description
–48 V DC
+ return (GND)
All grounds on system monitor cable
Console cable pin 11
Console cable pin 36
LFBEN (line forced bypass enable)
LFBENR (line forced bypass enable return)
MDF GND
Note: At connector P1 on the PFTU, pins 25 and 50 are labeled SWE for "switch enable."
When pin 25 is grounded by the attendant console or pin 50 is grounded by the system
monitor, line transfer is activated.
NN43021-310
Standard 06.01
Installing Power Failure Transfer Units
Use the following procedure and any instructions provided with the Power
Failure Transfer Unit (PFTU) to install and connect PFTUs.
Procedure 13
Installing a PFTU
1
Install a PFTU according to the manufacturer's instructions.
2
Attach the yellow PFTU label to the designation strip, indicating the top
connector as P1 and the bottom connector as P2.
3
Install two NE-A25B type 25-pair cables from connectors P1 and P2 on
the front of the PFTU to the PFTU termination area at the MDF.
4
Cross-connect wiring for PFTU operation as shown in Table 6.
5
For AC-powered systems, install the A0367916 auxiliary power supply.
a.
Attach the unit to the wall using screws in the four mounting holes.
b.
Connect a #24 (or larger) AWG wire from the –48 V connection on
the auxiliary power supply to the PFTU termination area on the MDF.
March 2013
Connection
PFTU connector P1, pin 49
PFTU connector P2, pin 49 and MDF GND
MDF GND
PFTU connector P1, pin 25
MDF GND
PFTU connector P1, pin 50
MDF GND
PFTU connector P2, pin 24
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