“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

SZ-21 DIRECT DRIVE HAZARDOUS DUTY 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.

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. 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. 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

 

SPRING

 

HOUSING

 

COVER

 

PLATE

 

SPRING

Figure 1

HUB

 

COUNTER-

 

CLOCKWISE

 

FOR STANDARD

 

ROTATION

Figure 2

SPANNER

WRENCH

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.

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.

 

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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Hubbell SZ-21 manual Installation, Maintenance, Spring Replacement
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SZ-21 specifications

The Hubbell SZ-21 is a versatile and innovative device designed to enhance electrical distribution systems in various applications. This product caters to both commercial and industrial needs, providing reliable performance and exceptional efficiency. The SZ-21 is engineered with advanced technology, which sets it apart from traditional alternatives.

One of the main features of the Hubbell SZ-21 is its compact and modular design. This allows for easy installation in limited spaces while ensuring maximum functionality. The modular architecture of the SZ-21 enables seamless integration into existing systems, making it a favored choice for upgrades and retrofits.

Additionally, the SZ-21 boasts a robust multi-polar output, allowing for efficient circuit management. This feature supports various configurations, ensuring that the device can adapt to diverse operational requirements while maintaining performance throughout its lifespan. Its flexible design makes it suitable for use in various environments, from manufacturing facilities to commercial buildings.

The technology embedded in the SZ-21 enhances its operational efficiency significantly. It is equipped with smart monitoring capabilities that provide real-time data analysis and diagnostics. Users can access this information via integrated communication interfaces, which facilitate proactive maintenance strategies and reduce downtime. By monitoring parameters such as voltage, current, and temperature, the device informs users of potential issues before they escalate into significant problems.

Safety is paramount in electrical distribution, and the Hubbell SZ-21 includes several features to mitigate risks. It is built to comply with stringent safety regulations, ensuring protection against overloads and short circuits. Additionally, the device is designed with enhanced thermal management systems that help prevent overheating, extending its life and reliability.

Finally, the Hubbell SZ-21 is recognized for its energy efficiency. By optimizing power distribution and reducing energy losses, it contributes to overall cost savings and promotes sustainable practices. Its durability, combined with low maintenance requirements, ensures that the SZ-21 is not just an investment in current performance but also in long-term reliability.

In summary, the Hubbell SZ-21 stands out as a sophisticated solution that amalgamates compact design, advanced monitoring technology, and safety features into a reliable electrical distribution device. Whether for new installations or upgrades, it empowers users with efficiency and adaptability, making it a preferred choice in modern electrical applications.
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