TOSHIBA - 18
TX Series 48 - 1250A
Another common application for decel control is on material handling convey-
ors as a means to prevent sudden stops that may cause products to fall over
or to bump into one another. In overhead crane applications, soft stopping of
the Bridge or Trolley can prevent loads from beginning to over swing on
sudden stops.
3.4.1 Start Deceleration Voltage
Factory Setting = 60% of line voltage
Range = 0% - 100% of line voltage
The step down voltage adjustment eliminates the dead band in the
deceleration mode that is experienced while the voltage drops to a level
where the motor deceleration is responsive to decreased voltage. This
feature allows for an instantaneous drop in voltage when deceleration is
initiated.
3.4.2 Stop Deceleration Voltage
Factory Setting = 20% of line voltage
Range = 0% - 100% of line voltage
The stop voltage level setpoint is where the deceleration voltage drops
to zero.
3.4.3 Deceleration Time
Factory Setting = 5 sec.
Range = 0 - 60 sec.
The deceleration ramp time adjusts the time it takes to reach the stop
voltage level set point. The unit should be restarted and stopped to verify
that the desired deceleration time has been achieved.
DO NOT EXCEED THE MOTOR MANUFACTURER’S
RECOMMENDED NUMBER OF STARTS PER HOUR.
WHEN CALCULATING THE NUMBER OF STARTS PER
HOUR, A DECEL CURVE SHOULD BE COUNTED AS A
START CURVE. FOR EXAMPLE: RECOMMENDED
NUMBER OF STARTS PER HOUR = 6, ALLOWABLE
STARTS WITH DECEL CYCLE PER HOUR = 3.
