MVP30 Operators
’ Guide
3
OM-09000-0-04-004B
AML Oceanographic Ltd.
1.3 INSTALLING THE MESSENGER
If the limit switch on the outer sheave does not detect the Dock messenger, the winch will
continue to recover the tow cable. As a safeguard to keep the fish from being recovered into the
outer sheave, a second limit switch has been installed on the inner sheave. This will halt the
recovery by generating an emergency stop when triggered.
The messenger (refer to
Figure 2
)
is a piece of ¼” outside diameter polyethylene spiral wrap,
approximately 0.05” thick that is secured to the tow cable using 3M
TM
Super33 electrical tape.
CAUTION: Do not substitute the messenger with a different size spiral wrap material. The
diameter of the messenger is critical to reliable limit switch operation. (Use
the material provided in the spares kit).
Figure 2
: Attaching a Messenger to the Tow Cable
2
OPERATING INSTRUCTIONS
CAUTION: It is highly recommended to not use Freewheel Mode when performing
stationary profiles (when the vessel is not underway). Conducting
Freewheel operations will deliver a shock load to the tow cable on the
system when the brake is applied, especially in shallow water deployments.
When performing underway Freewheel deployments, the tow cable creates a
virtual underwater sheave which prevents a shock load on the tow cable
from occurring. When performing computer automated Stationary Profiles,
the profiling mode in the MVP Controller software should be set to Constant
Speed or Constant RPM.
CAUTION: Do not substitute tape with inexpensive electrical tape; experience has shown
that other tapes are not robust enough to withstand the intended application. If
tape from alternative manufacturers are to be experimented with, please
ensure that regular inspections of the messenger condition are conducted.
WARNING:
The MVP system should only be operated by trained personnel. Keep all
personnel away from the winch during profiling operations.
