9 Common problems and processing
Conditions
Reasons
How to solve
( 1) The power phases are linked wrongly,
( 1) Exchange the power cords of the two phases.
The hoist can not
which results in the start of the phase
(2) Check whether the current is normal, replace
be operated
protection and makes it unable to
a proper fuse or restart the non-fuse switch.
operate.
(3) Check whether the current is normal, and
(2) The power fuse is burned or the no-fuse
replace a proper fuse.
switch is off.
( 4) Repair or replace the electricity wire that
(3) The fuse in the control circuit burns.
breaks or has bad contact.
( 4) The power cord or the wire of the control
(5) Measure whether the voltage is over 10%
circuit breaks or is not linked properly.
lower than the standard voltage.
(5) The voltage is too low.
(6) Check whether the motor phase is correct-
(6) The motor makes a sound but does not
repair and make proper insulation.
rotate.
(7) Confirm the reason of pressing the emergency
(7) The emergency switch is pressed
switch.
(8) a.Operate the hoist manually, if it works
(if installed).
properly,it means that the control coil or
(8) The contactor is bad.
cable has bad contact-find out the location
of bad contact and have it repaired.
b.If the hoist can not be operated manually,
it is necessary to check whether the main
power supply is normal. If the main power
supply is ok, it is caused by bad contact.
If it is unable to output normally, the
contactor should be replaced.
The hoist can not
The coil of the contactor fuses
Replace the contactor.
be stopped
(it is in short circuit fault).
The brake slides
The motor brake wears.
Replace the friction disc.
The chain/chain
(1) The chain is not lubricated enough
wheel of the lower
and properly.
( 1) Lubrication.
hook makes
(2) The chain wheel is worn.
(2)Replace the chain and chain wheel.
abnormal noise
( 1 )Imperfect earth.
( 1) Provide perfect earth.
Electric leakage
(2)The dusts in air gather on electrical
(2)Keep the electrical parts clean and
parts or the humidity is too high.
make humidity low.
( 1 )The oil plug is not applied.
(l)Install a proper plug.
(2)The oil plug is loose.
Oil leakage
(3)The oil plug gasket is not installed.
(2)Tighten the plug.
( 4 )The gasket is worn or deteriorated.
(3)Install a proper plug gasket or replace
a new gasket.
lll1ill
10 Instructions of using and inspecting
for electric chain hoist
Caution: When using the electric chain hoist, conduct in accordance with the following items:
1.Confirm that the ISO level of electric chain hoist in use is in accordance with using conditions.
2.No overloading.
3.Electric chain hoist must be equipped with appointed chain.
4.lt is forbidden to use if the lifting height of electric chain hoist is short.
5.Daily check-up before use.
6.Before use, check chains and links whether they are loose, twisted or twined. Make maintenance before use.
7.lt is forbidden to use if the anti-separation device of lower hook is valid or lack.
8.lt is forbidden to use if the chain is lack of up and down stop device.
9.lt is forbidden to use if the chain is twined with the weights.
10. It is forbidden to use the front end of hook to lift the weights.
11.Do not make repeated operation about lifting up and down rapidly.
12.Do not lift beyond the up and down limit switch.
13.Do not walk or stand under the hoist when lifting.
14.Do not lift the weights slanting(within 15 degrees)
15.Prevent the electric chain hoist falling down.
16.lf the operation frequency is high, the chain of electric chain hoist should be replaced annually.
17. Under the following special conditions, such as below -40't,
above 1 00't, corrosive orexplosive
environment, the chain should be replaced
every six months, and the lower hookshould be replaced every
two years. (If the operation frequency is high, the lower hook should be examined annually and replaced
every two years.)
18.lf in the electroplate, heat treatment plant, the surface of hoist should be do periodic
inspection monthly, and chain should be replaced annually.
19.After breaking, the chain can not be welded by yourself.
20.Chain should be lubricated before operation.
21.Gears, bearings and other friction parts should be added lubricants timely.
22. When not using hoist in a long time, please safely keep after doing proper rust proofing.
23.Electric chain hoist users will not be permitted to modify, if necessary, commission factory to modify.
24.lt should be avoided to lift the weights with two hoists at the same time, it is dangerous. If in extreme
circumstance, it should lift carefully within the range of sufficient loading capacity.
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