controller can hold the speed command at zero before a Serial Speed Command
Failure or Analog Signal Failure will occur.
LT10 Brake Drop Delay
This timer delays the drop of the brake when one of the outputs is assigned as Brake
Control or Drive On and that output is used to control the brake.
The LT10 Brake Drop Delay timer begins after the Direction input has been dropped and
the speed command has reached zero speed.
The Brake Control output will turn off when the Brake Drop Delay time has expired.
LT12 Current Hold Time
This parameter determines how long the drive will maintain full current and control of the
motor after the direction inputs have been turned off. During this time, motor current will
continue to flow (however the analog input will be clamped, and the speed control gains
will be reduced) to allow the motor to hold zero speed until the brake has set. This timer
should be adjusted longer than the actual required time for the brake to mechanically
drop.
The LT12 Current Hold Timer begins after the Direction input has been dropped, the
speed command has reached zero speed, and the LT10 Brake Drop Delay timer has
expired.
The Drive On output will turn off when the LT12 Current Hold Time has expired.
LT13 Current Ramp Down Time
Once the time in the LT12 Current Hold Timer has expired, current will continue flowing
to the motor, but the drive will ramp the motor torque down to zero over the time adjusted
in the LT13 Current Ramp Down Timer. This provides a smooth transition of the load to
the brake and a quiet de-energization of the motor. This timer should be adjusted such
that the drive shuts off the current before the controller drops the STO Inputs and opens
the motor contactor. If the STO Inputs are dropped before the current is shut off, it is
, which can prevent
further operation for 1 to 3 seconds, depending on the drive size; likewise, a STO Inputs
Dropped event may be logged. Therefore, the times should be adjusted to prevent this.
Additionally, during this time the speed control is turned off to prevent the motor from
driving against the brake.
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