CMC Rescue MPD User Manual page 16

USING THE MPD
14
AS A BELAY DEVICE
For the greatest system redundancy and therefore safety ensure the Belay
Line system is anchored and operated independently of the Main Line
system.
As with the Main Line, it is recommended that someone assist the Belay
Line operator by feeding rope to ensure there are no tangles or snags that
would cause the operator to unnecessarily stop the operation.
BELAYING THE EDGE TRANSITION
To ensure proper hand-tight tension of the Belay Line (such as during edge
transitions), firmly grip the load end of the rope with one hand and apply
friction, so that there is no slack in the rope between the load and your
hand. The other hand feeds the running end into the MPD so that the
rope is unseated from the sheave tread . This will reduce rope drag on
the sheave and keep the MPD from inadvertently locking up. This technique
allows the operator to match the speed of the Main Line. In contrast, the
technique of trying to simultaneously shuffle rope into and out of the MPD
will result in a repetitious start-stop motion of the belay rope and will likely
result in frequent unwanted lockups.
Applying Hand-Tight Tension
to the Belay Line
Load
The operator is bracing his
arm on his leg to help maintain
a fixed position of the friction
hand, while the other hand feeds
rope into the MPD.
Feed In Running End
!
FIRMLY GRIP RUNNING END OF ROPE TO ACTIVATE BELAY.