Hubbell MMD21 User Manual
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. 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.
O
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 (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
7
11
12
20
11
12
11
12
11
12
11
14
20
15
9
10
2
3
8
9
3
8
8
3
3
2
3
15
21
14
16
1
1
1
18
7
11
12
15
11
12
19
11
11
11
12
11
12
23
24
25
26
1
4
22
1
6
27
1
5
27
28
29
13
19
17
20
MMD21 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
1
1
SLIP–RINGS
CABLE LEADWIRES
MOVING END
CABLE
SET
432
SCREW
WATER–TIGHT
CABLE GRIP
MAINSHAFT
REEL
32
4
COLLAR
FRAME
SPOOL
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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