Grounding; Towfish Setup; General Rigging Notes And Cautions; Tow Cable Electrical Connection - Klein 3900 Series Operation And Maintenance Manual

3.3.4
It is important that the TPU be well grounded to minimize potential hazards to the
operator and electrical interference from other equipment. A good ground for the
system is a low impedance, well conducted path to the sea water. Always check the
quality of the electrical ground. Check that the AC power source ground has no
voltage potential with respect to the vessel hull.
3.4

Towfish Setup

3.4.1
Grease the waterproof connectors when attaching the connectors at the towfish.
Avoid putting excessive grease on the male pins. The silicone grease serves an
important lubricating and corrosion protection function. Use a high quality,
nonconducting grease such as Dow Corning DC-4.
When connecting the tow cable, make a general inspection of 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 assembly to be sure the retaining
screws and bolts are secure. Tail fin tether cables should be tight to the end of the
tail cone. It is important to make sure tail fins are straight and true.
temperature climates, protect the towfish from direct exposure to the sun prior to and
during operation.
3.4.2
It is essential to exercise care when making and breaking the tow cable
connections at both the TPU and the towfish ends. The electrical connection
procedures are provided below.

Grounding

General Rigging Notes and Cautions

CAUTION Always avoid putting excessive silicon grease on the Subcon
male pins. Apply 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

Tow Cable Electrical Connection

Towfish Setup
3-5