TROUBLE
PROBABLE CAUSE
CHECK AND REMEDY
e)
Wrong voltage or frequency
e) Use the voltage and frequency indicated
on hoist identification plate.
For three phase dual voltage unit, make
sure the connections at the conversion
terminal board are for the proper voltage
as described on page 4.
f)
Low voltage
f) Correct low voltage condition as described
on page 5.
g)
Brake not releasing--open or
g) Check electrical continuity and connec-
shorted coil winding; armature
tions Check that correct coil has been in-
binding
stalled. The coil for three phase dual volt-
age unit operates at 230 volts when the
hoist is connected for either 230 volt or
460 volt operation. Check brake adjust-
ment as described on page 16.
h)
Excessive load
h) Reduce loading to the capacity limit of
hoist as indicated on the identification
plate.
2
Hook moves in
a)
Wiring connections reversed at
a) Check connections with the wiring
the wrong
either the control station or
diagram.
direction
terminal board (single phase
unit only).
b)
Failure of the motor reversing
b) Check connections to switch Replace a
switch to effect dynamic brak-
damaged switch or a faulty capacitor.
ing at time of reversal (single
phase unit only).
c)
Phase reversal (three phase unit c) Refer to installation instructions on page
only)
5.
3
Hook lowers but
a)
Excessive load
a) See Item lh.
will not raise
b)
Open hoisting circuit - open or
b) Check electrical continuity and repair or
shorted winding in' reversing
replace defective part. Check operation of
contactor coil or speed selecting
limit switch as described on page 5.
relay coil; loose connection or
broken wire in circuit; control
station contacts not making;
upper limit switch contacts
open.
c)
Motor reversing switch not op-
c) Check the switch connections and actu-
erating (single phase unit only)
ating finger and contacts for sticking or
damage. Check centrifugal mechanism for
loose or damaged components. Replace de-
fective part.
d)
Phase failure (three phase unit
d) See Item lb.
only).
4
Hook raises but
a)
Open lowering circuit -open or
a) Check electrical continuity and repair or
will not lower
shorted winding in reversing
replace defective part. Check operation of
contactor coil or speed selecting
limit switch as described on page 5.
relay coil; loose connection or
broken wire in circuit; control
station contacts not making;
lower limit switch contacts
open
b) See Item 3c.
b)
Motor reversing switch not op-
5
Hook lowers
erating (single phase unit only)
a) See Item lb.
when hoisting
a)
Phase failure (three phase unit
control is
only).
operated.
19
