Hubbell MMD28 User Manual

INSTALLATION and MAINTENANCE INSTRUCTIONS

MMD28 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. Atension 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 360 number on serial plate.

turns should match last digit in model

If model number includes an “R”, reel is reverse rotation and wrench must be rotated clockwise.

Figure 1

(See EXPLANATION on parts list page.)

SPRING

HOUSING

SPRING

HUB

COVER

PLATE

Figure 2

COUNTER-

CLOCKWISE

FOR STANDARD

ROTATION

SPANNER

WRENCH

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.

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

“IN” with 2/3

cable off reel–

SPRING OK

BROKEN SPRING

INDICATORS

other hardware for tightness.

C. Check for broken springs by pulling about 2/3 cable off reel and observing “Broken

“OUT” with 2/3

cable off reel–

SPRING

BROKEN

Figure 3

Spring Indicators” on sides of spring canisters. See 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. Areplacement spring is supplied sealed in its housing and the old unit should be discarded 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.

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.

SPOOL SHAFT

SIDE VIEW

PAWL

SPRING

Install

against flat

END VIEW

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

SPRING

HUB

(Spring not

shown)

SHAFT

GROOVE

11 12

MMD28 DIRECT DRIVE ELECTRIC CABLE REELS

Always specify SERIAL NUMBER &

MODEL NUMBER when ordering parts.

ILLUSTRATED PARTS LIST

TO DETERMINE ROTATION OF REEL

ELECTRICAL CONNECTIONS

LEADWIRE INPUT FIXED END

(CUSTOMER SUPPLIED)

SLIP-RING

LEADWIRES ARE

NUMBER TAGGED

SLIP-RING LEAD TO

MOVING CABLE CONNECTIONS

BRUSH TERMINAL

SLIP–RING

COVER

SLIP–RING ENCLOSURE

•

600 VOLTAC. 250 VOLT DC. WATERTIGHT, DUST TIGHT.

• DO NOT EXCEED AMPERAGE RATING OF CABLE OR SLIP RING.

•

NUMBER OF CIRCUITS MAY VARY FROM TWO (MINIMUM) TO 36 (MAXIMUM). FOUR CIRCUITS SHOWN.

CONNECTIONS

SLIP–RINGS

CABLE LEADWIRES

MOVING END

CABLE

SET

432

SCREW

WATER–TIGHT

CABLE GRIP

MAINSHAFT

REEL

SPOOL

FRAME

COLLAR

STANDARD REVERSE

ROTATION ROTATION

Cable is payed out and retracted as shown

when viewing reel from spring motor side.

NOTE:

Wire size, wire connectors, connection sequence, and connection methods must comply with National Electrical code and Local Electrical ordinances. If in doubt, contact a local electrical contractor or electrical inspector.

COLOR SEQUENCE FOR TYPE SO CABLE

THREE CONDUCTOR CABLE # 1 – BLACK # 2 – WHITE # 3 – GREEN (ground)

FOUR THRU TWELVE CONDUCTOR CABLE # 1 – BLACK # 2 – WHITE # 3 – RED # 4 – GREEN (ground) # 5 – ORANGE # 6 – BLUE # 7 – WHITE W/ BLACK TRACER # 8 – RED W/ BLACK TRACER # 9 – GREEN W/ BLACK TRACER #10 – ORANGE W/ BLACK TRACER #11 – BLUE W/ BLACK TRACER #12 – BLACK W/ WHITE TRACER

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