7-12 Testing Hoist. Yale Electric Hoist

Below you will find brief information for Electric Hoist . This manual provides instructions on the correct installation, operation, and maintenance of the Yale KELC Electric Hoist. It also includes a parts list. The manual covers topics such as pre-installation checks, connecting the hoist to electrical service, operating the hoist, lubrication, and maintenance.

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7-12. TESTING HOIST.

a. General. After completion of reassembly and before placing hoist in service, hoist should be tested to insure safe operation.

To test: suspend hoist from an overhead supporting member of sufficient strength to carry twice rated load; connect to a power supply of the specified voltage (see data plate attached to motor); and perform the following checks and adjustments.

b. Check For Correct Control Operation. Refer to Section II, paragraph 2-4. d, under “Warning.” c. Check Upper and Lower Limit Stop Operation (paddle

limit). To determine if upper and lower limit stop functions properly, make the following checks while operating hoist with push button control and actuating the limit lever by hand:

(1) Depress “

“ push button and with chain running in raise direction, pull down on end of limit lever at tail chain side of hoist (left side facing cover end). The “UP” limit switch should cut off power, causing the hoist to stop.

(2) Depress “

“ push button and with chain running in lowering direction, push up on same end of limit lever. The “DOWN” limit switch should cut off power, causing the hoist to stop.

(3) If hoist does not stop in both travel directions, check for improper wiring. Refer to par. 6-2 and appropriate wiring diagram. If wiring is correct, check to see that limit switch is correctly installed.

(4) As a final check, operate hoist (no load) in the lowering direction and allow tail chain limit actuator to trip limit lever.

Hook should stop. Repeat check in hoisting direction and allow lower block to trip limit lever. Hook should stop.

d. Check Upper and Lower Limit Stop Operation (electronic

limit switch). To determine if upper and lower limit stop functions properly, make the following checks while operating hoist with push button control and actuating the limit lever by hand:

(1) Press up push button and verify operation of electronic limit switch upper limit. Reset as necessary.

(2) Press down push button and verify operation of electronic limit switch lower limit. Reset as necessary.

(3) If hoist does not stop at one or both of the set limits, check for improper wiring. Refer to paragraph 6-2 and appropriate wiring diagram. If wiring is correct, check to see that proximity switches are correctly installed and sensing properly, paragraph 7-11.f.

e. Check Hoist With Rated Load. Attach rated load to lower hook and check hoist operation. If hoist does not lift rated load, refer to par. 7-13.

(1) Operate hoist to raise load. When control is released, hoist should instantaneously stop and hold load at that level.

(2) Operate hoist to lower load a short distance, then release control. Hoist should stop instantaneously and hold load at that level.

(3) If hoist does not stop or hold load refer to Section VI.

7-13. TEST PROCEDURE FOR CHECKING OPERATION OF

OVERLOAD CLUTCH.

a. General. The overload clutch must be tested using known weights. The following prerequisites (par. (1) through (4)) must be strictly observed in performing this test.

(1) A qualified person shall determine before testing, that all structures supporting the hoist are adequately strong to with stand the test load of 200 percent of rated hoist load, whether hoist is tested in installed position or moved to a designated test facility.

(2) Loads used for testing must be accurately known.

(3) Test shall be made only by a qualified operator thoroughly familiar with the hoist and the purpose of the test.

(4) Provide adequate and proper rigging to insure test loads are securely attached, properly balanced, and will lift level.

b. Test Procedure. With the above prerequisites satisfied and hoist properly connected to electrical power, proceed with the test as follows:

(1) Using a known load equal to rated load of hoist, operate hoist to lift load. Raise load high enough to be certain the entire load is freely suspended. Clutch should not slip at

rated load. If hoist does not lift rated load, clutch requires adjustment. Refer to Section V, par. 5-4. c.

(2) Increase load to 200 percent rated load and operate hoist to lift the load. Clutch must slip, causing the hoist to refuse to lift the load. If hoist lifts this overload, the overload clutch is out-of-adjustment and must be readjusted. Refer to Section V, par. 5-4. c.

(3) If clutch slips as required in step (2) above, continue to run hoist (clutch slipping-hoist refusing to lift load) for five (5) cycles of one (1) second each.

(4) Remove excess weight to return the load to rated hoist load. Lift rated load one final time to be certain that the clutch does not slip and that the hoist lifts the rated load.

WARNING

DO NOT LIFT MORE THAN RATED LOAD EXCEPT FOR TEST PURPOSES

NOTICE

THIS EQUIPMENT MUST BE EFFECTIVELY GROUNDED ACCORDING TO THE NATIONAL ELECTRIC

CODE, ARTICLE 250, 610-61 AND OTHER APPLICABLE CODES.

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Key features

Coil type chain
Hook or lug type suspension
Single or two speed
Overload clutch
Adjustable electronic limit switch
Paddle-type limit switch
Push button station
Built-in mechanical interlock

Frequently asked questions

The overload clutch is designed to prevent the hoist from lifting loads that exceed its rated capacity. If the load exceeds the clutch's preset setting, the motor will continue to run but the clutch gear will slip, preventing the load from being lifted. This helps protect the hoist from damage.

To adjust the electronic adjustable limit switch, press both SET buttons simultaneously. The red ALERT light will flash, and the hoist can be operated through its full range of lift. Raise or lower the hook to the desired set point and press the corresponding SET button (UP for upper limit, DOWN for lower limit). Repeat this process for the other limit. The hoist will now stop at the newly set limits.

Use Bar and Chain Oil (LUBRIPLATE or equal) on the load chain. It is essential to lubricate the chain regularly to ensure smooth operation and prevent wear.