Cab shall be provided with a 2-position key-operated switch to allow
transfer of control from cab to [pendant] [radio control] station and a red
pilot light mounted in cab shall be provided to indicate that the control
has been transferred to other station. Selection of one operating station
shall lock out the controls of other stations. A 2-position switch shall
be provided to raise and lower the pendant station.
2.4.8
Pendant Control Station
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NOTE: Delete the following paragraphs if pendant
control is not specified.
If pendant control is not specified, delete
paragraphs. If the crane is higher than 18 m (60
feet) above the operating floor and the span is
greater than 15 m (50 feet), consider including a
pendant drive for ease of movement of the pendant if
it is not towed by the trolley; otherwise delete
this paragraph. Pendant drive speed should be the
same as the trolley.
**************************************************************************
2.4.8.1
General
Pendant control station enclosure shall be NEMA Type [1] [3R] [7] [9] [12].
Physical size of pendant shall be held to a minimum. A separate cable of
corrosion-resistant chain consisting of minimum 6.4 mm 1/4 inch wire shall
be provided. Pendant station shall be attached to [underside of crane
bridge footwalk] [an auxiliary girder] and shall hang vertically with
bottom of pendant at 1 m 40 inches above floor. Weight of pendant shall
not be supported by control cable.
2.4.8.2
Operating Pushbuttons
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NOTE: Delete requirement for auxiliary hoist
pushbutton when no auxiliary hoist is used.
Provide [bridge][gantry] and trolley directions
normally oriented to main compass headings. Select
method of festoon suspension: For multiple girder
cranes select underneath footwalk and for
single-girder cranes select auxiliary girder. If a
hoist thermal sensor is specified, include
requirement for yellow pilot light.
**************************************************************************
Operating pushbuttons shall be heavy-duty, dust-and-oil-tight type with
distinctly-felt operating positions which meet requirements of NEMA ICS 2.
Pendant control buttons shall be momentary pushbuttons. Pushbuttons
(except the POWER-OFF button) shall be the recessed type to avoid
accidental operation. Diameter of buttons shall be a size which will make
operation possible with a thumb while holding the pendant with same hand.
Nameplates shall be provided adjacent to each pushbutton. Barriers shall
be provided on pendant between various pushbutton functions, except on
elements mounted in junction box. In a multi-speed application,
dual-position pushbuttons shall have a definite click-detent position for
SECTION 14630A
Page 40
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