Hubbell 4220 User Manual

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SPECIFICATIONS

4220

Hubbell Industrial Controls, Inc.

June 1994

Repl.: October 1984

EUCLID™ AC & DC POWER LIMIT SWITCHES

SIZE 2, 3, 4, 5, 6, & 6A

General Information

D-CLimit Switchesare devices that are used to interrupt the main power circuit, setting up a dynamic braking circuit that quickly stops hook travel with a minimum of drift.

A-CLimit Switchesare similar in construction to D-C Limit Switches. The difference is in operation. A-C Limit Switches disconnect two power lines to the hoist motor which then is stopped by a magnetic brake.

Positive trigger lock-out

Direct action contact opening and closing

One-piecemovable contacts

Exclusive arc transfer action

Sturdy housing

Safety chain on cover

Clearly marked leads

Rugged construction

Oversize ball bearings

Application

Euclid A-CandD-CCrane Power Limit Switches provide dependable protection againstover-hoistingproblems such as damage to the trolley frame and hoising mechanism. In case ofover-travel,these Limit Switches disconnect the hoist motor from the line, preventing further hoist motion.

Operation

For dc operation the Power Limit Switch is mounted on the trolley floor of the crane. When the hook block rises into the danger zone, it lifts the suspended reset weight. As the load of the reset weight is removed from the operating lever, the tripping weight (an integral part of the operating lever) operates the switch. Normally closed power contacts are opened, normally open dynamic braking contacts are closed through a resistor. The

motor armature and series brake are disconnected from the supply line. The armature, series field and braking resistor are connected in series. RESULT: Setting of the series holding brake and dynamic breaking for a quick stop.

Reversing the crane controller lowers the hook to return the Limit Switch to the “run” position by

means of the suspended reset weight.

For ac operation, when the Power Limit Switch is tripped, the shoe brake is applied and the load is stopped. The load cannot be Hoisted when the Limit Switch is tripped, but Lowering can be performed as usual because the lowering circuit is unaltered.

Description

Positive trigger lock-out

Quick make-and-brakecontacts, which directly handle the motor circuit, are locked in position until tripped. Theroller-typetrigger lockouts prevent positively any operation of the Limit Switch until the full power of the hightensile,oil-tempered,magnafluxed spring is available to assure extremely fast operation for either tripping or resetting. Operation in any intermediate position of the operating lever is impossible.

Direct contact opening and closing

In the remote possibility of spring failure, the contacts are operated by the direct drive action of the tripping and reset weights. In tripping, as the reset weight causes the trip pin to engage the operating pin to operate the contacts. In resetting, the reset-pindoes the job.

One piece movable contacts

The low inertia of these contacts practically eliminates any contact bounce.

Exclusive arc transfer system

This arc transfer system combined with the shape of the arc chamber allows greater arc interrupting in a smaller space. The arc is confined to a controlled path for more efficient extinguishing. No destructive burning of the contacts can occur as the arc is transferred to the rearmost part of the magnetic blowout coil guards and to the central rod conductor in the arc shield. A smaller Limit Switch is made possible.

Sturdy Housing

Size 4, 5, 6, & 6A cases are of cast iron. Size 2 and 3 cases are molded fiberglass. The cover is of tough glassreinforced polyester resin. It is easily removed for ready access to the contacts.

Safety chain

The insulated cover is securely fastened to the case by means of a safety chain to prevent loss when removed from the case.

Clearly marked leads

Flexible leads for external connections extend through snug-fittingneoprene bushings in the back of thecast-ironcase. They are clearly marked to speed installation.

Rugged Construction

High-qualitymaterials reduce maintenance. All parts are ofnon-corrosivematerials. Contacts arehard-drawncopper, except for sizes 3 & 6A which use silver faced tips. The shaft is stainless steel. Allcurrent-carryingparts are copper or brass. Contact and shunt fastening screws are stainless steel.

Ball Bearings

Four oversize, double-sealedball bearings are permanently lubricated to minimize friction and reduce maintenance.

Early Break Auxiliary (EBA)

The EBA option is available for crane hoists that are controlled with AC or DC drives. The EBA contacts (DPDT) operate prior to the power contacts, thus providing a signal to turn off the drive before motor power interruption.

Installation

Euclid™ Type 4220 Crane Power Limit Switches are easily field installed.

Mount horizontally on top of the trolley frame of the hoist, with mounting feet down. Install the split-sleevesuspended weight guide around the deedended cable. A bracket or striker plate may be attached to the hook block, if necessary, to lift the suspended weight when hoising. Steel cable is furnished for connection the suspended weight to the operating lever.

D-CUnits Only

The operating lever is adaptable for either right or left-handoperation. Unless otherwise specified,right-handoperation is furnished. Change in installation forleft-handoperation can be made either at the Factory or in the field. Terminal markings only are affected. Refer to wiring diagram for correct connections.

Resistors For D-CLimit Switches

Euclid™ Type K-exclusivecontinuous wound, corrosion resistant, nonbreakable resistors, are specifically designed for use with Euclid™ Type 4220 Hoist Limit Switches. See Price List 4220.

Page 2

SIZE

A

B

C

D

E

F

G

H

J

K

L

M

N

P

R

S

T

U

V

W

X

Y

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2 & 3

9-7/8

1-3/4

5-1/2

12-5/8

5-1/2

3-7/8

8-1/16

5-1/8

1-5/8

4-1/2

1/2

5-1/4

5

1-7/16

1-7/16

1-5/8

18

5

3-1/2

13/32

9/16

1/4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

14-1/16

2-1/4

8-5/8

17-7/8

8-1/8

7-3/8

11-1/4

6-3/4

2-3/8

6-3/4

1-1/2

7-5/8

6-

1-3/4

3

2-1/2

21

5-1/2

4

9/16

1/2

3/4

11/16

5

18-3/16

3

12-1/2

21-1/4

11

10-1/4

22-5/16

9-1/2

2-7/8

8-3/4

2-1/4

9-7/8

8-3/8

3

3-

3-3/4

27

7

5

9/16

5/16

1-1/8

11/16

6 & 6a

24-13/16

7-1/2

18-1/4

27-3/4

16-7/8

15

22-5/16

14

3

11-1/2

2-3/4

13-1/2

7-1/4

2-

3

2-

27

9

6

13/16

7/16

1-1/2

13/16

13/16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NOTE:

Catalog dimensions are not to be used for construction purposes. Prints will be furnished upon receipt of your order with your request for prints.

 

APPROXIMATE WEIGHT IN POUNDS

 

 

LIMIT SWITCH WITHOUT CABLE,

LIMIT SWITCH WITHOUT

PART NUMBER

SIZE

FITTINGS AND WEIGHT

CABLE, FITTINGS AND WEIGHT

 

 

NET

BOXED

NET

BOXED

4220-71220-001

2

 

 

 

 

4220-71221-001

28

40

50

64

 

4220-72530-001

3

 

 

 

 

4220-72531-001

 

 

 

 

 

 

 

 

 

4220-71240-001

4

70

98

100

128

4220-71241-001

 

 

 

 

 

4220-71250-001

5

170

210

225

265

4220-71251-001

 

 

 

 

 

4220-71260-001

6

 

 

 

 

4220-71261-001

 

 

 

 

 

300

360

370

420

 

 

4220-71260-003

6a

 

 

 

 

4220-71261-003

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Page 3

LIMIT SWITCH RESISTORS

FOR USE WITH DYNAMIC LOWERING CRANE HOISTS

250 VOLTS D.C.

DC LIMIT SWITCH RESISTORS

 

 

 

 

 

 

 

230/250 VDC, ENCLOSED

 

 

 

 

 

Disc.

 

FOR USE WITH DYNAMIC LOWERING HOISTS

Sch E37

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HP

PART

 

 

 

DIMENSIONS

 

 

 

RANGE

NUMBER

 

A

B

 

C

 

D

 

E

 

 

 

 

 

 

 

 

 

 

 

5 – 10

69453-069

 

12.75”

13.37”

 

12.00”

 

11.12”

 

6.06”

11

– 13.5

69453-070

 

15.50”

13.37”

 

14.75”

 

11.12”

 

6.06”

14

– 26

69453-071

 

15.50”

13.37”

 

14.75”

 

11.12”

 

6.06”

27

– 33

69453-072

 

15.50”

13.37”

 

14.75”

 

11.12”

 

6.06”

34

– 45

69453-073

 

15.50”

13.37”

 

14.75”

 

11.12”

 

6.06”

46

– 65

69453-074

 

15.50”

13.37”

 

14.75”

 

11.12”

 

6.06”

66

– 100

69453-075

 

18.25”

13.37”

 

17.50”

 

11.12”

 

6.06”

101 – 135

69453-076

 

21.00”

13.37”

 

20.25”

 

11.12”

 

6.06”

136 – 200

69453-077

 

27.00”

13.62”

 

20.25”

 

6.00”

 

9.75”

201 – 265

69453-078

 

27.00”

13.62”

 

20.25”

 

6.00”

 

9.75”

NOTE: Duplex DC Power Limit Switches require two

Sets of L.S. Resistors

Hubbell Industrial Controls, Inc.

A subsidiary of Hubbell Inc.

4301 Cheyenne Dr., Archdale, NC 27263

Telephone (336) 434-2800• FAX (336)434-2803

http://www.hubbell-icd.com

sales@hubbell-icd.com

ER-694-2M© 1994

Printed in U.S.A.