CM2 Sidescan Sonar User Manual
16. CM2-WIN-300 Winch
Temperature Alarm
Later units are fitted with an audible temperature alarm. The alarm is intended to protect the winch motor
from excessive temperatures, particularly when recovering cable with the towfish fitted with the optional wing
depressor.
The alarm sensor is fitted to the end of the motor casing. If the casing temperature exceeds 80C the alarm
sounds intermittently; if it exceeds 90C the alarm sounds continuously. The alarm sound stops when the
temperature falls back below these limits.
If the alarm sounds, the user should minimize use of the winch to avoid possible damage. Note that the
alarm also sounds briefly when power is initially connected to the winch.
Signal Cable
The signal cable (or “deck” cable) running from the winch to the STR or C-Case should preferably be a
shielded twisted pair. If the cable is no more than 10m an RG58 coaxial cable is suitable. Polarity of
connection is not important. Pins B and F are used on the winch connector. The other end of the cable
should be fitted with a BNC or MIL-C-5015 connector, depending on the version of the STR, etc.
Control Pendant
The control pendant supplied with the winch includes a pair of switches, mechanically interlocked so that
only one (wind in or wind out) can be operated at any instant. The connections for the control pendant are as
follows:-
Pin E…White button (wind out)
Pin H…Common (+24v)
Pin A…Black button (wind in)
Winch Specifications
Capacity
300m of 4.7mm tow cable
Power
24V at up to 100A peak, 50A peak if “soft start” fitted
Construction
Stainless
steel
Winch dimensions (mm) and weight
45OW x 350D x 300H
47kg when fitted with 300m cable
63kg packed in transit case with control pendant, power cables, etc
Environment
-10 to +45ºC operating
-20 to +50ºC non-operating
Replacing the Tow Cable
Tools required include metric hex keys, metric combination wrenches (10mm, 8mm, 7mm) and a No2
Pozidrive (or a Phillips) screwdriver. Loctite 243 or equivalent (not high strength Studlock) is also needed.
If a tow cable is fitted, wind its full length, except for a couple of turns, on to another temporary reel.
To remove the cable drum the winch handle has first to be removed. The handle is secured to the motor
mounting plate by two M5 screws whose nuts or heads (depending on model) are accessed beneath the
motor cover. The motor cover is released by removing the 3 M4 screws at its base then lifting it clear. On
later units there is a soft-start controller mounted to the inside of this cover and care must be taken not to pull
on any of the attached wires.
Disconnect the handle from the motor mounting plate.
Remove the 4 M4 screws holding the slip ring cover. Pull the white nylon body of the slip ring connector off
the black body of the Mercotac slip ring unit. Whilst pulling at the connector hold the black slip ring unit in its
Version 3.6 (2008)
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