9
(2) In some cases, a booster transformer will be needed
to compensate for power cord losses or low-source
voltage. If a booster transformer is needed, call sup-
plier.
(3) CAUTION: DO NOT OPERATE THE MOTOR
FOR ANY REASONS, IF THE MEAS-
URED RUN VOLTAGE IS LESS THAN
THE MOTOR NAMEPLATE RATING!
(4) Always secure the power cord to the platform with
Fig. 7 Typical Hoist Control
3.2 Power Supply and Hoist Control
3.2.1 General
(1) Check if voltage indicated on the hoist nameplate
corresponds to the power supply rating.
(2)
Single phase motors
are factory connected for
either 220 VAC or 110 VAC.
On dual voltage machines
change plug and wiring
according to drawing inside control box.
Three phase machines
are factory connected for
220 VAC, 3 Ø.
(3) It is important to note that SINGLE-PHASE motors
are more sensitive to overloading and voltage drop
than three phase motors.
Therefore never exceed maximum rated load, and
see to it that the 110/220 VAC power supply is always
available.
In case of dif
fi
culties have an electrician or quali
fi
ed
person read voltage at motor terminal during lifting
operation. Especially for high lifting operations, which
require long cords, it is essential to use power cords
of suf
fi
cient size (see par. 3.2.3) to avoid excessive
voltage drop.
(4) WARNING: NEVER OPERATE THE HOIST
OR ANY OTHER ELECTRIC EQUIP-
MENT IN A POTENTIALLY EXPLOSIVE
ATMOSPHERE: around distilleries,
re
fi
neries, chemical plants, ship or
silo interiors.
Always obtain of
fi
cial approval before
commencing operations at these or similar loca-
tions.
3.2.3 Power Cords and Grounding
(1) To prevent voltage drop exceeding the allowable 10%
we recommend to use at least #10, STO type power
cords, 600 VAC rating.
To minimize voltage drop due to power cord length
on high lifts, select an outlet at the halfway point to
reduce the total power cord length on the job.
a strain relief
fi
tting and
shackle (Fig. 7), so the
cord weight will be off the
connector.
(5) When
fi
nished for the day,
make certain the power
cord is disconnected at the
hoist pigtail as well as at the
main outlet.
(6) Be sure to
ground all
electric equipment
.
Do not use wire rope as
a ground!
Fig. 6 Strain Relief
Fitting
3.2.4 Hoist Control
Control
(Fig. 7) is by
–
push-buttons
, which automatically return into
STOP-position, when not activated, and an
–
EMERGENCY STOP button
.
DO NOT
fi
x push-buttons in run position.
Other possible control: pendant control (available on
request)
3.2.2 Fuses / Circuit breakers
If connected to a circuit protected by a fuse, use
Time-
Delay-Fuse
.
Check if specification of fuses, which pro-
tect electrical equipment, corresponds to the
amperage indicated on the machine nameplate. The
recommended service requirements
per hoist
are:
Single phase Three phase
amps.
110 V
220 V
30
220 V
–
20
