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Wiring

70 Series Hazardous

Brake Instructions

DESCRIPTION

The 70 Series Brake is a direct acting, electro magnetically released, spring set unit that utilizes rotating and stationary

disc contact to supply positive braking action with quick release and setting capabilities at all times. Brakes which are

not provided with a floor mounting bracket are intended to be mounted as an integral part of electric motors listed for

corresponding hazardous locations where the acceptability of the combinations has been determined by Underwriter’s

Laboratories, Inc. The explosion-proof assembly is completed by assembly of the brakes to the motors.

READ THIS BULLETIN CAREFULLY BEFORE INSTALLING OR OPERATING THE

70 SERIES BRAKE. FAILURE TO COMPLY WITH THESE INSTRUCTIONS CANCELS

ALL WARRANTIES SINCE THE SAFETY OF THE UNIT MAY BE ENDANGERED BY

IMPROPER INSTALLATION OR OPERATING PROCEDURES.

Bulletin No. BK4606 (8/07)

4740 WEST ELECTRIC AVENUE  MILWAUKEE, WI 53219  PHONE 414/672-7830  FAX 414/672-5354  www. dingsco.com

MOTOR MOUNTED* FOOT MOUNTED

MODEL MODEL

NO. Torque NO. Torque

R71010-9 10 lb. ft. FR71010-9 10 lb. ft.

R71015-9 15 lb. ft. FR71015-9 15 lb. ft.

R72025-9 25 lb. ft. FR72025-9 25 lb. ft.

R73035-9 35 lb. ft. FR73035-9 35 lb. ft.

R74050-9 50 lb. ft. FR74050-9 50 lb. ft.

R75075-9 75 lb. ft. FR75075-9 75 lb. ft.

*If a hazardous location brake is purchased by other than an

authorized electric motor manufacturer, a Foot Mounted brake

must be purchased to obtain the UL label.

CAUTION

DO NOT OPERATE MANUAL RELEASE

OR ENERGIZE BRAKE COIL BEFORE

INSTALLATION IN ORDER TO PRESERVE

PRE-ALIGNMENT OF ROTATING DISCS

FOR EASE OF INSTALLATION.

USE ONLY HUB FURNISHED BY DINGS

SPECIFICALLY FOR USE IN HAZARDOUS

LOCATION BRAKES. DO NOT OPERATE

BRAKES IN EXPLOSIVE ATMOSPHERE

WITH COVER OR COVER BOLTS

REMOVED.

MANUAL RELEASE (See Figure 1)

To manually release brake, push in release knob and rotate

counterclockwise until strikes stop-pin. Brake will remain

released until release knob is pushed in and turned clockwise

or until power is restored, automatically resetting the brake.

THERMAL RELEASE

If the brake overheats, the thermal release mechanism will release

spring pressure on the friction discs, releasing brake. To reset ther-

mal release, allow brake to cool, then push in release knob (17)

and rotate clockwise until it strikes the stop-pin. Check brake

operation as overheating may indicate a broken lead wire or

burned out coil.

The thermal release mechanism has been calibrated at the factory

and the setting of the bimetal element and control rod MUST

NOT BE DISTURBED. If the mechanism does not function

properly, the complete pressure plate assembly (9), complete

magnet plate assembly (3), release gears (34) and items 31

through 50 must be returned to the factory for adjustments.

G060629-006

Figure 1.

Table 1. List of Models

Summary of content (8 pages)

PAGE 1
Bulletin No. BK4606 (8/07) 70 Series Hazardous Brake Instructions READ THIS BULLETIN CAREFULLY BEFORE INSTALLING OR OPERATING THE 70 SERIES BRAKE. FAILURE TO COMPLY WITH THESE INSTRUCTIONS CANCELS ALL WARRANTIES SINCE THE SAFETY OF THE UNIT MAY BE ENDANGERED BY IMPROPER INSTALLATION OR OPERATING PROCEDURES. MOTOR MOUNTED* MODEL NO. Torque R71010-9 10 lb. ft. R71015-9 15 lb. ft. R72025-9 25 lb. ft. R73035-9 35 lb. ft. R74050-9 50 lb. ft. R75075-9 75 lb. ft. FOOT MOUNTED MODEL NO. Torque FR71010-9 10 lb.
PAGE 2
WARNINGS 2 A. Read this bulletin carefully before installing or operating the brakes. Failure to comply with the installation or operating instructions cancels all warranties and may cause injury to personnel and damage to property. B. DESCRIPTION The 70 Series brake for hazardous location is a direct acting, electromagnetically released, spring set brake that utilizes rotating and stationary disc contact to supply positive braking action.
PAGE 3
The thermal overload mechanism can be reset manually after a cooling off period. Before resetting, the root cause for actuating the thermal overload mechanism needs to be determined and corrected. To minimize the possibility of overheating the brake to a point where the thermal overload mechanism will be actuated, the performance of the brake has to be matched to the requirements of the application.
PAGE 4
Item No. 1 2 3 3 4 5 6 7 7 7 8 9 10 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Description Cover Gap Adjusting Nut Magnet & Coil Assembly, 3 Phase Magnet & Coil Assembly, 1 Phase Gap Adjusting Nut Torque Adjusting Nut Adjusting Nut Washer Torque Spring, 10 & 35 lb. ft. Torque Spring, 15 & 75 lb. ft. Torque Spring, 25 & 50 lb. ft. Stud Pressure Plate Rotating Friction Disc 10 - 50 lb. ft. Rotating Friction Disc 75 lb. ft. Stationary Disc 25 - 75 lb. ft.
PAGE 5
INSTALLATION OF BRAKE ON MOTOR ENDSHIELD (See Figures 2, 3 and Table 4) Do not operate manual release or energize brake coil before installation in order to preserve pre-alignment of rotating disc for easy installation of brake to motor. Because of the close fit on all joints (bracket, cover, hub), care should be taken to prevent damage to all machined surfaces. Do not operate brake in hazardous location with cover removed. All testing must be done in a non-explosive atmosphere. 1.
PAGE 6
Model Number Torque Lb. Ft. “BC” +1/32 -.000 Spring Length “D” Shaft Length “AH” Max. R71010-9 R71015-9 R72025-9 R73035-9 R74050-9 R75075-9 10 15 25 35 50 75 5/8 5/8 5/8 5/8 5/8 5/8 1-5/16 1-5/16 1-5/16 1-5/16 1-5/16 1-5/16 3-7/16 3-7/16 3-3/4 4-3/8 5-1/8 5-1/8 Magnet Gap “A” A-Min. A-Max. .030 .030 .030 .035 .035 .045 .062 .062 .062 .062 .062 .062 Table 4. Adjustments INSTALLATION OF FOOT MOUNTING BRAKE (See Tables 4, 5 & Figure 5) 9.
PAGE 7
TORQUE ADJUSTMENT (See Figure 2 & Table 4) 14. Adjust length of torque springs (7) to dimension “D” for rated torque. To decrease torque, increase spring length (“D” max =1-1/2”). Both torque springs must be adjusted to the same length. FRICTION DISC REPLACEMENT (See Figure 2) 15. Remove cover screws (21) and cover (1). 16. Remove pivot stud (32), reset spring (37), drive gear (31), drive spring (50), and driver (39). Unscrew release gear (34) and remove release bearing (35).
PAGE 8
TROUBLESHOOTING BRAKE DOES NOT RELEASE Check for failure of power supply to brake. Check brake visually for broken or damaged parts. Check for broken leadwire or bad electrical connection. Check for correct voltage. Voltage must correspond to that listed on brake nameplate. If voltage is more than 10% below figure stamped on nameplate, magnet will not pull in, causing coil to burn out within minutes. If voltage is more than 10% above, coil will overheat and burn out.