Automatic Power Selector (APS) Model: 13505
ATTACHMENTS: DC POWER SOURCE DWG 11488
A GENERAL INFORMATION
The APS, Model 13505, provides a simple, solid state solution to the need for routing redundant DC power
sources for vital electronic equipment while maintaining isolation of the DC power sources.
Two independent batteries rated at the same nominal voltage are wired to separate terminals on the APS and
internal diodes maintain total isolation between them. A single output terminal is wired to the ZF Marine
Propulsion Control System.
The APS is rated for loads of up to 70 Amps on 12-24VDC systems. The unit is ruggedly constructed with
heavy-duty wiring studs and epoxy-potted components in an anodized aluminum case.
B APS SPECIFICATIONS
Model: 13505
Maximum Load Current: 70 amps
Operating Temperature: - 40 degrees C to +80 degrees C; derate linearly from 100% @ 50 degrees C to 70%
@ 80 degrees C
Voltage Drop: 0.7 VDC @ 50% load; 0.9 VDC @ full load
Dimensions: 3.25" x 4.5" x 3.1" (8,3 x 11,4 x 7,9 cm)
C MATERIALS PROVIDED
The single APS is supplied with a hardware packet containing (6) hex nuts, (3) lock washers, (4) self-tapping
mounting screws, (1) instructions diagram.
The twin APS is supplied with (2) single APS hardware packets.
D INSTALLATION
Refer to Drawing 11488 DC Power Source Kit.
1. Shut off all charging sources and disconnect the negative (ground) side of each battery which will be wired to
the APS.
2. Mount the APS(s) in a suitable location which will keep wire runs to a minimum length, and is preferably
ventilated, for cooler operation. The case of the APS is electrically isolated from the internal diodes, so
mounting on either a metal or non-metal surface is acceptable.
3. Complete the wiring as indicated.
4. Reconnect the negative battery posts.
E IMPORTANT NOTE ABOUT BATTERY SOURCES
Whenever the load is turned on, it can be drawing power from the batteries. Therefore, if the batteries are
not simultaneously being recharged, or if charging will not be available for an extended period, it is
recommended that the load be shut off to prevent complete discharge of batteries.
NOTE: Not all of the hardware will be used in the installation; some spares are provided. Nut size is M-6.
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