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SHORT-STOP
Form 1250B
SHORT-STOP
Electronic Motor Brake
Type - G
Instructions
TB Woods Incorporated
Chambersburg, Pennsylvania
6+2576723
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� Table of Contents
1. INTRODUCTION..............................................................................................................................2
2. DESCRIPTION AND APPLICATIONS ............................................................................................2
3. SAFETY NOTES...............................................................................................................................2
4. LIMITATIONS ..................................................................................................................................2
5. RATINGS ..........................................................................................................................................3
6. INSTALLATION..............................................................................................................................3
6.1 Mounting ......................................................................................................................................3
6.2 Wiring...........................................................................................................................................3
6.3 Interlock Terminals 3 and 4 ...........................................................................................................3
6.4 Power Wiring ................................................................................................................................4
6.4.1 Single Direction, Single Speed.................................................................................................4
6.4.2 Forward and Reverse...............................................................................................................4
6.4.3 Wound Rotor Motors ..............................................................................................................5
6.4.4 Electronic Drives.....................................................................................................................5
6.4.5 Single Phase............................................................................................................................5
7. OPTIONS ..........................................................................................................................................5
7.1 Programmable Controller Mode.....................................................................................................5
7.2 Option L (45 sec. max. braking time.)............................................................................................5
7.3 Option S (Higher Torque)..............................................................................................................5
7.4 Option BD / Y (Brake Disable/Timeout) ........................................................................................5
7.5 Option D (Dual-voltage operation).................................................................................................5
7.6 Option R (Braking using 3 motor windings)...5
7.7 Option P (Braking on demand).......................................................................................................5
8. ADJUSTMENTS ...............................................................................................................................6
8.1 Description of the Adjustments ......................................................................................................6
8.2 Setting the Adjustments .................................................................................................................6
9. HOW THE SHORT-STOP WORKS..................................................................................................6
9.1 Basic Concept ...............................................................................................................................6
9.2 Operation ......................................................................................................................................7
10. IF YOU HAVE A PROBLEM ..........................................................................................................7
10.1 Preliminary Checks......................................................................................................................7
10.2 No Braking When Motor is Turned OFF......................................................................................7
10.3 Motor Will Not Start ...................................................................................................................8
10.4 Before Returning Any Unit For Service:.......................................................................................8
11. LIMITED WARRANTY ..................................................................................................................8 2
1. INTRODUCTION
The SHORT-STOP electronic motor brake permits rapid
stopping of AC motors by DC injection, creating a station-
ary magnetic field within the motor.
Braking action is smooth, adjustable and frictionless.
Torque and time adjustments permit matching the braking
rate to almost any machine requirement.
The installation of standard units simply involves connec-
tion of six wires to the machine motor starter.
The SHORT-STOP has no effect on normal machine
performance, operation or motor life.
- FEATURES -
[ ] FRICTIONLESS BRAKING
[ ] TORQUE IS FULLY ADJUSTABLE
[ ] NO MECHANICAL CONNECTIONS
[ ] INTERNAL FUSES FOR PROTECTION
2. DESCRIPTION AND APPLICATIONS
The SHORT-STOP works with all AC motors other than
universal types. Each SHORT-STOP model covers all
motor sizes up to its rating for horsepower and amps.
Standard units are completely satisfactory for most
applications, particularly woodworking and metalworking
machines such as saws, lathes, grinders, sanders, etc.
Other applications are to replace worn-out mechanical
brakes, to minimize maintenance and to provide adjustable
stopping rates. They make retrofitting older machines easy,
since no mechanical connection is required.
Electronic brakes are useful where coasting is either a
production or a safety problem. However, since electronic
brakes require power to operate and do not provide holding,
they cannot be used as "fail-safe" brakes.
3. SAFETY NOTES
LOCK TOOL OR BLADE SECURELY. Saws and
grinders are often fastened with left-hand thread devices,
which tend to loosen when the machine is stopped too
quickly. Use of double nuts, or other positive locking
methods to prevent such loosening. Since braking may be
set to exceed starting torque, test for safe operation during
braking and check locking from time to time.
DON'T TAMPER WITH WIRING OR MAGNETIC
CONTACTOR. Once installed and adjusted, the SHORT--
STOP box cover should be closed securely.
Tampering with the internal parts or manually operating the
magnetic contactor is not only dangerous, but can cause
damage not covered by the warranty.
POWER LINE INTERRUPTION. The SHORT-STOP
uses AC line power to achieve its braking action. Thus a
power failure or disconnect, or the opening of a fuse, will
simply let the motor coast to a stop without braking. Do not
use the SHORT-STOP where failure to provide braking will
be a hazard.
HOLDING AGAINST A LOAD. The SHORT-STOP
cannot be used as a positive brake against overhauling loads
after the motor stops. In such applications, a positive lock,
a pin, or a separate mechanical brake must be used to
provide for holding at rest. Call factory for information on
other models if holding is desired.
4. LIMITATIONS
MOTOR TYPES. The SHORT-STOP will work with all
induction motors, including wound rotor types, and with all
three phase motors. It will work with all single-phase
motors except for DC and universal motors.
MOTOR HEATING. The heat generated during braking
can be considered equivalent to adding another start cycle,
if the TORQUE control is set very high. Therefore, high
cycle operations may require fan cooling.
Although motor heating is rarely a problem, it is minimized
by using the lowest torque setting that gives acceptable
operation.
IT IS UP TO THE USER TO INSURE THAT HIS
MOTOR WILL BE PROTECTED FROM EXCESSIVE
HEAT RISE, WHETHER FROM EXTREMES OF
RUNNING, STARTING OR BRAKING.
POWER OR FUSE FAILURE. Loss of power means loss
of braking, rega