8 Issue 1.0 August 1998
363-208-011 Appendix 2
NE00676-70 Local Alarm Relay Unit Installation Procedure
❑
Step 18:
Quickly and carefully disengage the connectors from the 404A and
reconnect them to the 404B.
❑
Step 19:
If you exceeded the time and service is dropped, no further action is
required and the system will recover automatically within 3 minutes.
❑
Step 20:
Tape the lug on the black ground lead (p/o the 404B) and pass it
through the chassis on the right side. Untape lug and refasten to frame
ground.
❑
Step 21:
Locate the J253 connector, part of a cable coming out of the center
rear of the 404B, and pass it through the center opening in the chas-
sis, and dress it toward the rear of the unit.
❑
Step 22:
Align the 404B with the chassis and carefully snap in place while mak-
ing sure that the cables are dressed properly.
❑
Step 23:
Locate P253 connector (p/o NE00676-30 G2 cable previously
attached to the LARU) and connect it to J253 from the 404B. It may be
necessary to temporarily remove the fan unit or baffle to accomplish
this.
❑
Step 24:
Recheck all faults and alarms as instructed in Step 10. There should
be no new alarms.
External Alarm Connections
❑
Step 25:
The external alarm connections are taken from P306 connector on the
LARU with a 25 pin D-sub female connector (J306) and cable, both
provided by the customer. It is recommended that 26 gauge twisted
pair wire be used between J306 and the customer’s alarm system or
distributing frame.
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