1. INTRODUCTION
The
STAR-BRAKE
serves as a complete motor control
system for use with all single speed, single direction
machines. Easy to install and adjust, it 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
•
OVERLOAD PROTECTION
2. DESCRIPTION AND APPLICATIONS
The STAR-BRAKE combines an across-the-line magnetic
starter with an electronic motor brake. The starter section
includes adjustable thermal overload protection. The
electronic brake permits rapid stopping of AC motors by
DC injection. Braking action is smooth, adjustable and
frictionless. Torque and Time adjustments permit
matching the braking rate to almost any machine
requirement.
The
STAR-BRAKE
works with most AC motors where
there is a need for a starter and brake combination.
Installation for the standard units simply involves the
connection of six power wires and three control wires.
Standard units are completely satisfactory for most
applications. Ideal for woodworking and metalworking
machines such as saws, lathes, grinders, sanders, etc.
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 double nuts, or other positive locking methods to
prevent such loosening. Test for safe operation during
braking and check locking from time to time.
DON'T TAMPER WITH WIRING. Once installed and
adjusted, the
STAR-BRAKE
box cover should be closed
securely. Tampering with the internal parts or manually
operating the magnetic contactors is dangerous, and can
cause damage not covered by the warranty.
POWER LINE INTERRUPTION. The STAR-BRAKE 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
STAR-BRAKE
where failure toprovide braking will be a
hazard.
HOLDING AGAINST A LOAD. The STAR-BRAKE 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 the factory for information
on other models if holding is needed.
4. LIMITATIONS
The STAR-BRAKE cannot be used with forward/reverse
or multiple speed systems. It will not work with Universal
Motors, Wound Rotor Motors, Drum Switch Controls, and
Electronic Drive Controllers. For these applications
consult the factory for the appropriate AMBITECH
product.
MOTOR HEATlNG. 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 at the
motor. (The
STAR-BRAKE
itself generates very little
heat.)
Although motor heating is rarely a problem, it may be
minimized by using the lowest torque setting that gives
acceptable operation.
IT IS UP TO THE USER TO MAKE SURE THAT THE
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, regardless of whether power is disconnected
by a switch, line or internal fuse, circuit breaker, etc. This
also applies to fuses internal to the
STAR-BRAKE,
where
the fuses are intended for the protection of internal
components.
POWER FACTOR CAPACITORS. Power factor
capacitors may NOT be used across a LOAD controlled
by the
STAR-BRAKE.
Move any such capacitors to the
LINE side.
DON'T OPEN POWER TO TERMINALS L1-L2-L3. If
power is removed from these power input terminals during
braking, the brake contactor will open under load which
may damage the
STAR-BRAKE,
and the motor will coast to
a stop.
