LEESON SM Series Sub-Micro Inverters User Manual
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03
START WITH DC BRAKE: When a START command is given, the drive will apply DC
BRAKE VOLTAGE (Parameter 22) for the duration of DC BRAKE TIME (Parameter 21) prior
to starting the motor to ensure that the motor is not turning.
04
AUTO RESTART WITH DC BRAKING: Upon a START command, after a fault, or upon
application of power, the drive will apply DC BRAKE VOLTAGE (Parameter 22) for the
duration of DC BRAKE TIME (Parameter 21) prior to starting (or restarting) the motor.
05
FLYING RESTART 1: LOW performance. Slowest synchronization and lowest current level.
This setting results in the smoothest synchronization.
06
FLYING RESTART 2: MEDIUM performance. Faster synchronization and higher current
level. This setting allows faster synchronization while retaining smoothness.
07
FLYING RESTART 3: HIGH performance. Fastest synchronization and highest current level.
This setting allows the fastest synchronization, but sacrifices smoothness.
When programmed for auto-restart (settings 04 - 07), the drive will attempt three restarts after a fault.
The interval between restart attempts is 15 seconds for setting 04, and 2 seconds for settings 05, 06 and
07. During the interval between restart attempts, the display will read “SP” to indicate Start Pending. If
all three restart attempts fail, the drive will trip into FAULT LOCKOUT (displayed “LC”) and require a
manual reset. Refer to Section 16.0 - TROUBLESHOOTING.
The FLYING RESTART 1 - 3 settings allow the drive to start into a spinning load after a fault or upon
application of input power. They differ in the time required to find the motor speed and the amount of
current required to synchronize with it. The faster the drive attempts to find the motor speed, the more
current is required. The first two restart attempts will try to start into the spinning load, but the third
restart attempt will act like AUTO RESTART WITH DC BRAKING.
NOTE: Settings 02 and 04 - 07 require a two-wire start/stop circuit to operate. The RUN contact
must remain closed for the power-up start and auto-restart functions to operate.
P04
STOP METHOD
01
COAST TO STOP: When a STOP command is given, the drive shuts off the output to the
motor, allowing it to coast freely to a stop.
02
COAST WITH DC BRAKE: When a stop command is given, the drive will activate DC
braking (after a delay of up to 2 seconds, depending on frequency) to help decelerate the load.
Refer to Parameters: 21 - DC BRAKE TIME, and 22 - DC BRAKE VOLTAGE.
03
RAMP TO STOP: When a stop command is given, the drive will decelerate the motor to a stop
at the rate determined by Parameter 20 - DECELERATION TIME.