Hubbell MMD21 manual Installation, Maintenance, Spring Replacement

Page 1
“OUT” with 2/3 cable off reel–
SPRING BROKEN
Figure 3
BROKEN SPRING
INDICATORS
“IN” with 2/3 cable off reel–
SPRING OK

INSTALLATION and MAINTENANCE INSTRUCTIONS

MMD21 DIRECT DRIVE ELECTRIC CABLE REELS

All units are provided with right hand rotation unless otherwise specified. This means that cable is pulled off spool top left or bottom right (spool rotates clockwise to wind cable) when viewing spring end of reel. See diagram on parts page.

Clock-type springs provide power for automatic cable take-up. Spring must be pretensioned at time of installation to insure that tension is applied to cable at all times. A tension adjustment spanner wrench is provided with each reel.

WARNING

Some reels with large or multiple springs are equipped with a ratcheted adjustment wrench. Follow separate instruc- tions for its use. Failure to use ratcheted wrench, on reels so equipped, could result in serious personal injury.

WARNING

Do not attempt to relieve spring tension using span- ner wrench. Doing so may result in personal injury.

INSTALLATION

1.Insure that machinery to be serviced by reel is at position closest to reel.

2.Securely mount reel in desired position using 3/8"(M10) bolts.Be sure spool is aligned with cable run.

3.Position optional cable guide, if reel is so equipped. See CABLE INSTALLATION DRAWING.

4.Connect free end of cable to junction box on machine or adjust cable stop so that desired length of cable extends from reel.

5.Remove cover plate on spring housing to expose shaft and spring hub. (See Figure 1).

6.Insert spanner wrench into holes in spring hub (Fig 2). Rotate wrench counterclockwise (for standard rotation). Number of 360O turns should match last digit in model number on serial plate. If model number includes an “R”, reel is reverse rotation and wrench must be rotated clockwise. (See EXPLANATION on parts list page.)

MAINTENANCE

Periodically: A. Use compressed air to clean collector assembly and inside of collector housing. Inspect collector assembly for brush wear and pitted slip rings.

B. Inspect cable for wear and check mounting bolts and

other hardware for tightness.

C.Check for broken springs

by pulling about 2/3 cable off

reel and observing “Broken

Spring Indicators” on sides of

spring canisters (Fig 3).

NOTE: Bearings and springs are prelubricated and require no periodic maintenance.

SPRING REPLACEMENT

WARNING

Do not attempt to remove spring from its housing. Clock- type springs can be dangerous to handle. Removal of spring from housing could result in personal injury.

The unique SAFETYCHANGE® spring motor consists of a spring and hub sealed within a housing. A replacement spring is supplied sealed in its housing and the old unit should be dis- carded completely.

1.

Turn off all electric power.

2.

Disconnect cable from machine junction box.

3.

Wind all cable onto reel to relieve all spring tension.

4.

Remove inspection cover from face of spring housing.

5.

Rotate spool clockwise and observe inner shaft. Shaft

 

should rotate clockwise and hub (with spring attached)

 

should remain stationary.

 

NOTE: Do not attempt to remove spring if resistance

 

is met or hub tends to rotate with shaft.

 

Continue to rotate spool and strike end of shaft

 

several sharp blows with a lead hammer or rubber mallet

 

until shaft rotates freely and hub remains stationary.

6.

Remove (4) nuts which secure spring motor(s) to frame.

 

SPRING

 

HOUSING

 

COVER

 

PLATE

 

SPRING

Figure 1

HUB

 

COUNTER-

 

CLOCKWISE

 

FOR STANDARD

 

ROTATION

Figure 2

SPANNER

WRENCH

7. Slide spring motor(s) off shaft and discard.

NOTE: On multi-spring reels, be sure to remove and save dowel pins which connect one spring hub with another. Also remove snap rings on shaft between spring housings.

8.Install replacement spring motor(s), pawls and pawl springs. NOTE: Pawl springs must be located between the pawls and the deepest section of the shaft grooves. Make sure

that pawls and pawl springs are inserted flush with ends of shaft and hub or they may rub against inspection cover.

CAUTION

Do not exceed number of turns indicated on serial plate. Over-tensioning can cause a broken spring, sheared shaft or other damage.

NOTE: If reel is equipped with ratcheted adjustment

wrench, follow instructions on separate sheet.

NOTE: On reels containing more than one spring, the hubs are connected at the factory. Therefore, by tightening the outer spring, the inside spring(s) will be tightened.

7.Remove collector cover and connect individual supply conductors to collector terminals. See ELECTRICAL CONNECTIONS diagram, on parts page.

 

PAWL

 

SPRING

SPOOL

 

HUB

 

 

SHAFT

 

 

(Spring not

 

 

 

shown)

 

SPRING

 

SHAFT

 

Install

 

SIDE VIEW

END VIEW

GROOVE

against flat

9.Tighten nuts (and extension bolts) securing spring housing(s) to reel frame.

10.Connect free end of cable to junction box on machine or adjust cord stop so that desired length of cord extends from reel.

11.Tension spring with spanner wrench. Refer to INSTALLATION section.

12.Replace inspection cover.

CONTINUED ON BACK PAGE

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Contents Maintenance InstallationSpring Replacement Electrical Connections Illustrated Parts ListKIT no Description QTY Model Number ExplanationAmpacity Collector Replacement Cable InstallationCable Installation Reference Drawing Cable Removal

MMD21 specifications

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