Si-tex SP38, Installation And Operation Manual, Page: 52 / 193

Sitex SP38 Installation and Operation
Document PN 29010101 V1r0
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The Sitex SP38 will operate on any voltage of 12 VDC and 30 VDC. This allows operation with
vessel battery systems of nominal voltages from 12 to 24 VDC.
Caution!
Do not power up the SPU until you have completed the installation, and
performed the steps outlined in “Post-Installation Checks.”
Generally, wiring for the positive leg of a DC system will be red or white, while wiring for the
negative leg (usually referred to as Ground) will be black.
Power to supply the autopilot should be taken directly from a breaker or distribution panel. The
autopilot should be wired into its own individual breaker or fuse. For the SP38 SPU, using
appropriately sized wire or cable (see
Table 1 ), wire the battery connections to the connector
plug and receptacle labelled J1 - B
ATTERY
I
NPUT OF THE
SPU . For the SP38 Control Head,
connect the Head Power Cable to the 4 pin receptacle on the back of the Head. Double-check
the wiring polarity before inserting the plug into the receptacle.
Caution! The SP38 SPU & the SP38 Head are NOT reverse-
polarity protected. If you wire the wrong voltage polarity at J1,
you will damage the SPU and Control Head! This will void the
warranty.
Refer to the following diagram of a typical power supply circuit:
Figure 23 – Typical Battery Connection to SPU