Form MHD56224
Edition 1
January 2000
71369375
© 2000 Ingersoll-Rand Company
Form MHD56224
Operation Instructions and Parts List for
EMERGENCY STOP AND
OVERLOAD VALVE
This instruction sheet provides information for personnel to operate and maintain the
Emergency Stop and Overload valve.
This sheet should be used in conjunction with Model FA2B Parts, Operation and
Maintenance Manual form MHD56177.
OPERATION
Emergency Stop (optional feature)
Refer to Dwg. MHP2133 on page 2. The emergency stop device
is located on the pendant. When activated, winch drum rotation
will immediately cease. To activate emergency stop valve conduct
the following:
1.
Depress (push down) red palm valve.
2.
Press emergency stop button on remote control pendant
(optional feature).
Emergency Stop Valve Operation
(Dwg. MHP2134)
NOTICE
• If winch overload occurs, overload device, if equipped, also
stops winch by activating the emergency stop device. To
operate winch after an overload, reduce load and reset
emergency stop.
Reset Emergency Stop Valve:
Refer to Dwg. MHP2134.
1.
Rotate black ring, located on stop button, in clockwise
direction until red stop button ‘pops’ up.
2.
Depress emergency stop valve ‘ON’ button.
3.
Winch is ready to resume operation.
Overload Device (optional feature)
An overload device is available on winches provided with the
emergency shutoff valve option. Overload device operation is
based on differential pressure between air motor inlet and
exhaust. The overload device is factory preset to actuate at 150%
(+/- 25%) of winch rated capacity.
When an overload condition is sensed, air is directed to the
emergency shutoff valve. Emergency shutoff valve activates to
secure supply air to winch, stopping winch operation.
If an overload shutoff occurs, winch load must be reduced. Reset
the emergency stop valve and operate winch in payout direction to
lower load.
Overload Valve Adjustment
Refer to Dwg. MHP2133 on page 2.
1.
Adjust overload valve by turning setscrew located at bottom
of Delta-P valve.
2.
Rotating setscrew clockwise will increase pressure required
to activate overload valve.
WARNING
• This adjustment can cause overload device to NOT activate
before winch’s safety limit is exceeded. This procedure should
only be done by personnel trained in testing and servicing this
winch.
3.
Rotating setscrew counterclockwise will decrease pressure
required to activate overload valve.
Checking Overload Valve Setting:
4.
Attach load line to a load that is calibrated to the maximum
load for which winch is rated. Move control lever to haul-in
position. If winch does not lift load, adjust the setscrew as
described above.
Setting the Overload:
5.
Attach load line to a load that is calibrated to 150% of winch
rated capacity. Shift control lever to haul-in position.
a.
If overload valve is activated, reset emergency stop
valve. Winch is ready for normal operation.
b.
If winch lifts load, lower load. Turn adjustment screw
counterclockwise in ¼ turn increments until overload
valve is activated when control lever is shifted to haul-in
position. After each ¼ turn, retest winch.
