Owner's Manual for TA150KGMR1 Pneumatic Winches for Personnel Lifting
page 28
A12876A-1214
2.7
Emergency Operation
Emergency lowering operations must be performed by a minimum of two
persons trained in the operation of the winch.
Always reset the brakes after an emergency lowering procedure, and make
sure that they function properly before the next regular lifting operation.
Communication must be established between rider, spotters, and the winch
operators. The operators should be able to visually monitor the rider through
their full range of travel.
Do not exceed the limitations of the alternative power supply or the winch
when running in emergency operation mode.
OPERATING WINCH IN THE EVENT OF POWER FAILURE
Each winch is equipped with two emergency brake release mechanisms (see
Figure 17) and a pneumatic diverter valve (see Figure 18).
2.7.1
EMERGENCY LOWERING PROCEDURE with emergency brake release.
The winch is equipped with two automatic caliper brakes which are spring
set and pressure released. In the event of a power failure, the brake will
automatically set until air pressure is re-applied, or until the brakes are
manually released with the release nuts on the brake bodies. See Figure 17.
a
SLOWLY RELEASE THE STATIC BRAKE (BEARING-SIDE).
1.
Remove the locking/guarding device on the static brake release nut.
2.
Slowly tighten the release nut until the brake is disengaged. Make sure
that the drum does not begin to rotate with the static brake released.
b
WHEN READY TO LOWER THE RIDER, SLOWLY RELEASE THE
DYNAMIC BRAKE (MOTOR-SIDE).
1.
Remove the anti-tamper tag on the static brake release nut.
2.
Verify that the rider’s path is clear for the emergency descent, and that all
spotters are ready for the operation.
3.
It requires approximately 90 kgs (200 lbs) to strip the rope from the drum.
Depending on the rider and rigging installed, it may require a tag line in
order to assist the rider descent.
4.
Slowly tighten the release nut until the brake barely starts to drift. Keep
the wrench engaged with the nut during the entire operation to maintain
control of the descent speed.
5.
Carefully lower the rider to safety by modulating the brake pressure with
the release nut position. Do not allow overspeeding to occur, and do not
abruptly halt the decents.
c
AFTER THE RIDER HAS RETURNED TO SAFETY, RESET THE
BRAKES TO NORMAL OPERATION SETTING.
1.
Reset the release nuts to their original positions.
2.
Install a new anti-tamper tag on the static and dynamic brake release nuts.
3.
When power is restored, be sure that both brakes function and
individually hold the rider as intended before the next regular operation.
