CM-ET Prostar - Manual (Page 5)

4
Figure 3A Figure 3B
Power supply
Same
Making sure the hoist will operate on
the power supply system
Name
plate
Load Hook
Chain
Stop
Control
Station
Mounting Hook
Power
Cord
NOTE: IN THIS MANUAL, NOMINAL VOLTAGES ARE
USED WHEN REFERRING TO POWER SUPPLY
SYSTEMS. HOWEVER, WITH NO MODIFICATION, THE
PROSTAR HOIST WILL OPERATE ON A RANGE OF
VOLTAGES AS INDICATED BELOW:
NOMINAL VOLTAGE HERTZ
VOLTAGE RANGE
230 208-240 60
460 440-480 60
220 200-240 50
380 365-395 50
415 400-430 50
575 550-600 60
Three Phase Hoists
Since the motor in a three phase hoist can rotate in either
direction, depending on the manner in which it is connected
to the power supply, the direction of hook movement must
be checked during the original installation and each time
hoist is moved to a new location as follows:
1. Move the manual disconnect switch handle to the “OFF”
position.
2. Connect the BROWN, GREY AND BLACK wires of hoist
power cord to load side of disconnect switch. Connect the
GREEN-YELLOW wire of hoist power cord to power
supply ground.
3. Move the manual disconnect switch handle to the “ON”
position.
4. Depress the (up) control. If the hook moves in the up
direction, the hoist is ready for operation. If the hook
lowers, move the disconnect switch handle to the “OFF”
position and interchange the BLACK and BROWN leads
at the disconnect switch. Move the disconnect switch
handle to the “ON” position and the hoist is now ready for
operation.
Checking for Adequate Voltage at Hoist
The hoist must be supplied with adequate electrical power
for proper operation and to reduce problems that may result
from insufficient power (low voltage). These include:
• Noisy hoist operation due to brake and/or contactor
chatter.
• Heating of the hoist motor and other internal components
as well as heating of wires and connectors in the circuit
feeding the hoist.
• Failure of the hoist to lift the load due to motor stalling.
• Blowing fuses or tripping circuit breakers.
• Dimming of lights or slowing of motors connected to the
same circuit.
For proper operation and to avoid these low voltage
problems, voltage (measured at end of the power cord while
lifting rated load) should be as the following chart indicates.
NOMINAL MINIMUM * MIN. VOLTAGE
POWER OPERATING AT INSTANT
SUPPLY VOLTAGE OF START
115-1-50/60 108 103
220-1-50 198 182
208-3-60 187 172
220-3-50 198 182
230-3-60 207 190
380-3-50 365 336
415-3-50 399 367
460-3-60 414 380
575-3-60 518 506
*The drop in voltage upon energizing the hoist should
not be below the value listed.
Low voltage can also be caused by using an undersize
extension cord to supply power to the hoist. The following
charts should be used to determine the size wires in the
extension cord in order to minimize the voltage drop
between the power source and the hoist.
115-1-50/60 units with contactor, 220-1-50 units and three
phase units (hoists with black control station)
MAXIMUM LENGTH OF EXTENSION CORD
Wire Size Single Three
Phase Hoist Phase Hoist
#16 A.W.G. 135 feet(40 M) 245 feet(73 M)
#14 A.W.G. 220 feet(66 M) 395 feet(120 M)
#12 A.W.G. 354 feet(107 M) 630 feet(192 M)
After the hoist is suspended from its support and you have
made sure the power supply complies with the above, the
hoist is ready for operation.
On the Double units, cut and discard the ties used to hold
the two strands of chain together. With no load on the lower
hook, depress the UP button in the control station and raise
the lower hook until it is about 2 feet below the bottom of the
hoist. Check both strands of chains for twists. Twists occur
if the lower hook block has been capsized between the
strands of chain during packing, shipment and/or handling.
Reverse the capsize to remove twists.
Loose
End of
Chain