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3-2
CHAPTER 3 Setup and Test
3.3
Power Requirements
The Series 3900 requires either 88–264 VAC, 47–63 Hz or 12 VDC power to
operate. The system is designed to protect against over and under voltage and
transient spikes. However, it is always best to check the power source carefully
before operating the equipment. Ensure that the power source is within the
required operational tolerances, with minimal noise and voltage spikes. As the
quality of onboard AC power varies from vessel to vessel, it is best to actually
check the AC power source with a voltmeter or an oscilloscope.
Since a variety of power connectors are in use throughout the world, it may be
necessary to use an adapter or to cut off the US-type plug on the AC power cord
and re-terminate it with a new plug. Should this modification be required, the
wires should be connected in accordance with Table 3-1.
3.4
Towfish Setup
Before connecting the tow cable to the towfish, check that the retaining screws
securing the towfish nose cone and tail section assemblies are tight. Check the tail
fins and tow bracket to be sure the retaining screws and bolts are secure. Tail fin
tether cables should be tight to the end of the tail cone, and the fins should be
straight and true. Grease the male pins of the waterproof connector when attaching
the connector at the towfish. Use a high quality, nonconducting silicone grease
such as Dow Corning DC-4 and avoid applying excessive grease.
temperature climates, protect the towfish from direct exposure to the sun prior to and
during operation.
Series 3900 Sonar System Operations and Maintenance Manual
SP-II TPU Power Cord Wiring
Table 3-1:
COLOR
Green
Blue or white
Brown or black
CAUTION Always avoid applying excessive silicone grease to the
connector pins. Apply only a light coat of grease, and never put grease into
the female connectors.
CAUTION Serious damage to the towfish electronics may occur if the
towfish is operated on deck for periods longer than fifteen minutes.
Between periods of operation, let the sonar cool for fifteen minutes. In high
FUNCTION
Ground (earth)
Neutral
Hot
P/N 11210085, Rev. 01
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