4 Issue 1.0 August 1998
363-208-011 Appendix 2
NE00676-70 Local Alarm Relay Unit Installation Procedure
Reference Documents
Reference Document List
Engineering Information
Engineering Notes
■ The LARU pwb is internally fused at 1/2 amp to protect the on-board DC/
DC Converter. The converter is also diode protected to guard against
improper polarity application of power.
■ The green power LED will light whenever correct polarity -48VDC is
present at power plug P305. Also the NP (No Power) relay is a normally
powered relay and is operated whenever input power is present.
■ P253 is a 9 pin D-sub plug (male) which receives its alarm information from
the SLC-2000 UIP as follows:
■ The conditions at P253 will either be +5VDC or +3VDC. Any voltage below
4.7VDC appearing at P253 will be interpreted by the LARU as an alarm. All
voltages are referenced to “CP RTN” on term 5.
Document Number Description
NE00676-70 Local Alarm Relay Unit (specification)
NS00676-01 Local Alarm Relay Unit (schematic)
TERM. # NAME
1 CRITICAL (CR)
2 MAJOR (MJ)
3 MINOR (MN)
4 POWER MINOR (PMN)
5 GROUND RETURN
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