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ZF Mathers, LLC
1415 Pacific Drive
Burlington WA 98233-3103 U.S.A.
800-546-5455 / 360-757-6265
Fax: 360-757-2500
S-214 Rev.A 6/01
A) GENERAL INFORMATION
The APS (Automatic Power Selector), Model 13505, provides a simple, solid state solution to the need for rout-
ing 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 Mathers Pro-
pulsion Control System.
The APS is rated for loads of up to 70 Amps on 12-24V 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 APS is supplied with a hardware packet containing (8) hex nuts, (4) lock washers, (6) self-tapping mounting
screws, (1) instructions diagram.
D) INSTALLATION
Refer to the installation diagram Figure 1:.
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 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. Complete the wiring as shown on Page 2.
3. Reconnect the negative battery posts.
Automatic Power Selector (APS) Model: 13505
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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