DRIVE SETUP
87
remain active. (Dropping of the external
Brake Pick relay will reduce voltage to
the elevator brake coil.)
Elevator Stop with Brake Control:
1. Automatic setting of the Brake and drive
shutdown sequence may begin at any
speed.
2. The Drive RUN command is released by
customer’s logic. This will set the
internal reference speed to zero and
start the Must Stop Timer. The velocity
regulator will continue to control velocity
and current, driving the speed to zero
via the decel rate.
3. When the drive measures encoder
speed as being zero (adjustable by #63)
the Brake Lift and Brake Pick outputs
will de-energize. The drive velocity
regulator will continue to hold zero
speed while the brake drops, as set by
the Brake Drop Timer #90.
4. When the Brake Drop Timer expires,
motor armature current ramp-down will
occur, as set by #85. This will gradually
transfer torque from motor to brake to
help prevent brake ‘thumping’.
5. When Current ramp-down is complete,
the drive will cease operating and open
the contactor.
6. If Brake Auto Stop #92 is ON, AND a
zero speed command is present, AND
the drive is stopped, the sequence of 2
– 5 above will be activated.
NOTE: The drive will turn OFF with the
Drive Run and Enable commands still
active. These signals must be cycled to
recover and re-start from this auto-stop
operation.
7. If the Must Stop Timer #91 expires
before zero speed is achieved, the
Brake Lift and Brake Pick relay outputs
will be de-energized and the drive will
shut down regardless of the actual
velocity. This is a secondary back up
means of ensuring that the elevator will
stop
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