SECTION THREE — Installing the 491
Wiring the 491
CAUTION!
Make sure that fuse or
Electrical power requirements
Connecting the 491 to ship’s power
The majority of installation problems are caused by shortcuts taken with system cables. When installing the 491, be sure that you:
•assemble connectors carefully
•don’t make sharp bends in the cables
•leave service and drip loops, so that moisture won’t run down the cables and into the 491 or the navigator
•
•if cables are shortened, lengthened (not recommended), or
•prevent interference from the transducer cable
The 491 is a
The connection between ship’s power and the 491 requires the
The wires in the power cable must be connected as follows (black and white can be connected together at the power source):
•Red → Positive (+) (fused lead)
•Black → Negative
•Green → Ground (earth)
NOTE: | The 491 should be grounded to | the vessel to eliminate interfer- |
| ence. Secure the green wire to | the vessel’s nearest grounding |
| point. Without an earth grounding, performance may be degraded. | |
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Connecting the 491 to the 961/962
The connection between the 961/962 and the 491 uses the
The cable is shipped with a round
Be sure you don’t cut off the
Figure 8 below illustrates the wiring at the 961/962 end of the cable. Table 4 describes the pin’s functions.
491 INSTALLATION MANUAL Revision A | PAGE 15 |
