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Low-Voltage Protection
Single-Phase Lodestar VS Hoists are equipped with software that
automatically slows the motor speed in a low-voltage condition.
This feature helps ensure safe lifting, even during unexpected
electrical situations. If this feature is engaging routinely, check
for adequate supply voltage and wiring.
SIGNS OF INADEQUATE ELECTRICAL POWER
(LOW VOLTAGE) ARE:
• Noisy hoist operations due to brake chattering.
• Dimming of lights or slowing of motors connected to the same
circuit.
• Heating of the hoist motor and other internal components as well
as heating of the wires and connectors in the circuit feeding the
hoists.
• Failure of the hoist to lift the load due to motor stalling.
• Blowing of fuses or tripping of circuit breakers.
Failure to properly ground the hoist presents the danger of
electric shock.
TO AVOID INJURY:
Permanently ground the hoist as instructed in this manual.
To avoid these low-voltage problems, the hoist must be connected
to an electrical power supply system that complies with the National
Electrical Code and applicable local codes. This system must also
provide slow blow fuses or inverse-time-type circuit breakers and
provisions for grounding the hoist.
Low voltage may also be caused by using an undersized cord and/or
connectors to supply power to the hoist. The following chart should
be used to determine the wire sizes in the extension cord in order to
minimize the voltage drop between the power source and the hoist.
Table 4. Minimum Wire Size
Length of
Extension Cord
Up to 200 feet
Beyond 200 feet
Failure to provide a proper power supply system for the hoist may
cause hoist damage and offers the potential for a fire.
TO AVOID INJURY:
Provide each hoist with a 20-amp, minimum, overcurrent-protected
power supply system per the National Electrical Code and
applicable local codes as instructed in this manual.
Operation with low voltage can void the CM repair/replacement
policy. When in doubt about any of the electrical requirements,
consult a qualified electrician.
Working in or near exposed energized electrical equipment
presents the danger of electric shock.
TO AVOID INJURY:
Disconnect power and lockout/tagout disconnecting means before
removing cover or servicing this equipment.
CHECKING LIMIT SWITCH (EPLS) OPERATION
The limit switch will automatically stop the hook at any
predetermined point when either hoisting or lowering.
VARIABLE SPEED ELECTRIC CHAIN HOIST WITH
OPTION
loose end screw and the frame when lowering a load may break the
Operate hoist over the entire length of its rated lift, checking upper
and lower limit switches for correct operation as follows:
4. Press (UP) control and raise the lower hook until top of hook
5. Cautiously continue raising the hook until the upper limit switch
6. If adjustment is necessary, see page 19.
7. Press (DOWN) control and cautiously lower hook until lower
8. If adjustment is necessary, see page 19.
NOTE: If the hoist is equipped with a chain container/bag, reset
the upper and lower limit switches as indicated on page 19.
Under no condition should the hook block or load be permitted
to come in contact with the chain container/bag. If contact is
made, the function of the chain container can be interfered with
and its fasteners imperiled.
NOTE: When chain bag is filled to capacity the bag must be no
more than 75% filled.
NOTE: If the hoist gears ever rotate without encoder input to the
drive, either due to encoder or wiring failure, or due to mainte-
nance or disassembly of the hoist, the limits must be reset as
described on page 19.
Minimum Wire Size
#14 AWG
CONTROL CORD
Contact Factory
Unless ordered on a special basis, the hoist is supplied with a
control cord that will position the control station approximately 4
feet above the lower hook when it is at the lower limit of the lift. If
this places the control station too close to the floor, a "control cord
alteration kit" (Part Number 28642) can be obtained from CM for
shortening the length of the control cord.
OPERATING INSTRUCTIONS
GENERAL
1. The load limiter is designed to slip on an excessive overload. An
12
Allowing the hook block to run into the bottom of the hoist when
raising a load or allowing the chain to become taut between the
chain and allow the load to drop.
TO AVOID INJURY:
Do not allow the hook block to contact the bottom of the hoist or
the loose end chain to become taut.
block is about 1 foot (305 mm) below the hoist.
stops the upward motion. The upper limit switch is set at the
factory to stop the hook block 3 inches (76.2 mm) from bottom
of the hoist on all units with standard 10-foot (3-m) lift except
Model AA. Factory setting is 6 inches (152.4 mm) for this model
and for all other models equipped with chain for lifts longer than
10 feet (3 m).
limit switch stops the downward motion. 7 to 11 chain links
(depending on hoist model) should be between the loose end
link and the hoist entry. See Figure 9.
Tying knots or loops to shorten the drop of the control station will
make the strain relief ineffective and the internal conductors of the
cord may break.
TO AVOID INJURY:
Shorten the control cord using the control cord alteration kit and
the instructions provided with the kit.
overload is indicated when the hoist will not raise the load. Also, a
clutching noise may be heard if the hoist is loaded beyond rated
capacity. Should this occur, immediately release the (UP) control
to stop the operation of the hoist. At this point, the load should
be reduced to the rated hoist capacity or the hoist should be
replaced with a load of the proper capacity. When the excessive
load is removed, normal hoist operation is automatically restored.
CAUTION: The load limiter is susceptible to overheating
and wear when slipped for extended periods. Under no
circumstance should the clutch be allowed to slip for more
than a few seconds.
P/N: 192047082 (REV AD) 627NH March 2022
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