LAWSON ENGINEERS LTD Ref : PJ1682
Issue Date : 06.06.2006
Main Pressure
Two gauges, one for each pump. Duplicated on the
winch.
Auxiliary Pressure
One gauge. Duplicated on the winch.
Hydraulic Oil Condition
Senders are fitted to all hydraulic oil filters. A
blockage in any causes a light to shine on the Winch
Start/stop panel. The HPU is
NOT
shut down.
6.8 SAFETY
CIRCUIT
Motion Alarm
The alarm is operated automatically when either the
A-frame or the winch are operated. A pressure switch
in the load sense line trips at 40 bar & this switches
on the alarm.
Emergency Stops
Located on the Remote Box, on the Winch and on the
HPU. An E stop being pushed causes a light to shine
on the HPU control panel. When putting the system
back into operation after an E stop has been pressed
the Reset button located on the HPU panel must be
pressed.
Umbilical Tension Overload
This is controlled by a loadcell that supports the
sheave. Once the tension in the umbilical rises above
the set point an alarm sounds and further movement
of the A frame outboard is impossible. The pre-alarm
is set at 5Te umbilical tension. The alarm and trip is
set at 6Te.
- 26 -
