Electric Chain Hoists
Features and Specifications
Motor
Standard NEMA C face, Class F insulation, TENV motors are provided for
standard commercial power supplies. The motor has a standard NEMA shaft
extension.
Automatic reset thermostats protect both single
speed and two speed motor. This complies with applicable NEC requirements
and relieves the user from providing motor running overcurrent protection.
Single Speed Motors
Single phase motors are capacitor start, induction-run, and reconnectable
for 115 volt or 230 volt, 60 hertz applications rated 15 minute duty with a
±10% voltage variation. Single phase motors are not reconnectable. Three
phase motors are induction type, reconnectable for 230 volt or 460 volt, 60
hertz power supply, rated at 30 minute duty with ±10% voltage variation.
Two Speed Motors
Two speed, 1800/600 RPM, motors are three phase induction type, not
reconnectable, rated at 30 minute duty with ±10% voltage variation.
Overload Cutoff
The Overload Cutoff is an electro-mechanical device designed to interrupt
the hoist lifting circuit if the load it senses exceeds the preset capacity
of the cutoff device. When the device interrupts the hoist lifting circuit,
the lowering circuit remains intact to allow the hoist load to be lowered
and removed. When the excessive overload, that has caused the device to
trip, is removed from the hoist, the hoist lifting circuit is automatically
restored.
Control
Choose from single or two speed. Completely enclosed controls are 3 pole
magnetic reversing type, mechanically interlocked rated at 600 volts. Two
speed controls are also electrically interlocked. Included is control
transformer for 115 volt control circuit. All wiring conforms to applicable
NEC and CSA requirements. Housed in NEMA type 3R enclosure with
lightweight, impact resistant Lexan resin cover, deep molded for
maximum accessibility.
Push Button Station
Pushbutton stations are NEMA types 4, 4X & 5, molded impact resistant
thermoplastic units with momentary contact type buttons. Push button
operating voltage is 115 volts. The thermoplastic enclosure is designed for
one hand operation and is supported by a strain relief chain.
Motor Brake
Direct acting, short stroke, AC magnet actuated disc type with a minimum
torque rating of 150% of the full load motor torque. Provides accurate
spotting and control of the load by quickly stopping the motor when power is
interrupted.
Mechanical Load Brake
Weston type, multiple disc can hold a full capacity load independent of
motor brake and can hold the load stationary in any position.
Geared Limit Switch
Interrupts the control circuit to stop the motor and applies the motor brake
when hook reaches its upper and/or lower limits of travel. Fully adjustable
in both upper and lower directions. Includes reversing circuit to prevent
hook overtravel in either direction.
Load Chain
Close link coil type, electric welded alloy steel, heat treated for wear
resistance and ability to withstand impact. All links precisely calibrated
for uniform size and shape, free from scale and lamination to permit proper
seating in load sheave pockets. Zinc Plated load chains are embossed with
"W" on each link for proper identification. The dead end of the chain is
securely attached to the hoist in a manner which will permit ease of
replacement.
Hooks
The hooks are drop forged, heat treated, ductile, alloy steel, and equipped
with spring latches. The lower hook is supported on a lifetime
pre-lubricated thrust bearing which permits the hook to rotate 360 degrees
under capacity load. The top hook is free to rotate for each attachment to
support.
Load Sheave
Precision cast, heat treated, alloy steel, 4 pocket for smoother operation
and increased chain life.
Gear Train
Combination of helical and spur gears, with all contact surfaces hardened
for wear resistance and designed in accordance with AGMA standards. All
gears and pinion shafts supported on both ends by anti-friction ball
bearings. Gears operate in a sealed oil bath.
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