Motortronics
Page 22
4.3.3
Interlock Contacts
The ABC Series unit must be interlocked with the motor starter coil circuit to disable the motor starter during the
braking cycle for proper operation (refer to 2.1.3). Two sets of "FORM C" contacts are provided on TB2 on
power board to interlock the motor starter with the brake. Terminals 1, 2, and 3 are the first set and terminals 4,
5, and 6 are the second. Use both sets for reversing starters, each in one of the contactor coil circuits. The
second set may be used as a status indicator in non-reversing starter applications. Never connect the interlock
contacts parallel to the contactor coil or across the power line. Circuit voltage potential: same as starter control
circuit, 240VAC maximum.
WARNING!
If this wiring is done incorrectly or not at all, severe damage to the unit may occur and the warranty on
the unit may be voided.
4.3.4
Mechanical Brake Release Relay
The ABC Series brake unit can work in conjunction with a mechanical brake by interfacing with the motor and
allowing for mechanical brake control. The ABC Series brake can be used for stopping, and the mechanical
brake can be used for holding. The Mechanical Brake Release contacts are N.O. relay contacts rated for 5A,
250VAC and are located at terminals 7 and 8 of TB2 on the Power Board (see section 2.3 for additional
operating details).
The unit will detect the motor start command and release the mechanical brake. When the stop command is
given, the ABC Series brake unit will continue to keep the mechanical brake released, proceed with the DC
injection braking sequence, then engage the mechanical brake at the end of the braking cycle. If the disable
feature is engaged while in "BRAKING" mode, the ABC Series will automatically set the mechanical brake.
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