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EMERGENCY FREE FALL
CONTROL VALVE:
The emergency free fall requires a two position, three-
way valve. The pressure port must be open to the
reservoir when the emergency free fall is not actuated
and must pressurize the free fall release port on the
winch when the free fall control button is pressed. A
selector valve with two detent positions is best suited.
If the emergency free fall is combined with controlled
free fall, a standard two position, four-way selector
valve with two detents should be used. (Refer to
TYPICAL HYDRAULIC CIRCUIT.)
CONTROLLED FREE FALL
CONTROL VALVE:
For positive speed control, the valve used for the
controlled free fall must be a “spring return”, two
position selector valve, which has good metering
characteristics and on which the pressure port is open
to the reservoir when the controlled free fall is not
operating.
USE OF AN E STOP:
(FOR EUROPEAN MACHINERY DIRECTIVE APPLICATIONS)
The use of an E stop (emergency) is mandatory in the
controls circuit. The E stop is to be placed in the
operator's control panel. The E stop must be designed
and placed in line with EN 60204 and EN 418.
PRESSURE GAUGE:
To monitor free fall release port pressure install a 1000
psi (69 bar) pressure gauge between the free fall
control valve and the release port.
IMPORTANT:
The circulation return lines must go direct to reservoir.
Pressure in the free fall housing must not be permitted
to exceed 10 psi (0.7 bar).
RECOMMENDATIONS CONTINUED
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