TROUBLE
PROBABLE CAUSE
CHECK AND REMEDY
6
Hook does not
a)
Brake slipping
a) Check brake adjustment as described on
stop promptly
page 16.
b)
Excessive load
b) See Item lh.
7
Hoist operates
a)
Excessive load
a) See Item lh.
sluggishly
b)
Low voltage
b) Correct low voltage condition as describe(
on page 5.
c)
Phase failure or unbalanced cur- c) See Item lb.
rent in the phases (three phase
unit only).
d)
Brake dragging
d) Check brake adjustment as described on
page 16.
8
Motor overheats
a)
Excessive load
a) See Item lh.
b)
Low voltage
b) Correct low voltage condition as described
on page 5.
c)
Extreme external heating
c) Above an ambient temperature of 104'F.,
the frequency of hoist operation must be
limited to avoid overheating of motorSpe-
cial provisions should be made to ventilate
the space or shield the hoist from radiation.
d)
Frequent starting or reversing
d) Avoid excessive inching, jogging or plug-
ging. This type of operation drastically
shortens the motor and contactor life and
causes excessive brake wear.
e)
Phase failure or unbalanced
e) See Item lb.
current in the phases (three
phase unit only).
f)
Brake dragging
f) Check brake adjustment as described or.
page 16.
g)
Motor reversing switch not
g) See Item 3c.
opening start winding circuit.
(Single phase unit only).
9
Hook fails to
a)
Limit switches not opening cir-
a) Check switch connections, electrical con-
stop at either or
cuits
tinuity and mechanical operation Check
both ends of
the switch adjustment as described on page
travel
16. Check for a pinched wire.
b)
Shaft not rotating
b) Check for damaged gears.
c)
Traveling nuts not moving
c) Tighten guide plate screws Replace dam-
along shaft -guide plate loose;
aged part. shaft or nut threads damaged.
10
Hook stopping
a)
Limit switch not holding adjust-
a) See Item 9.
point varies
ment.
b)
Brake not holding
b) Check the brake adjustment as described
on page 16.
Two Speed Hoists
11
Hoist will not
a)
Open Circuit
a) Open or shorted motor winding, loose'
operate at slow
or broken wire in circuit, speed selectir I
speed in either
contactor stuck in opposite speed mode
direction
Replace motor, repair wire and/or re-
pair speed selecting contactor.
b)
Phase failure
b) See Item lb.
20
