LEESON SM-Basic Series Sub-Micro Inverters (Obsolete) - Manual (Page 34)

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19 ACCELERATION TIME
This sets the acceleration rate for all of the speed reference sources (keypad, speed pot, jog, MOP,
and preset speeds). This setting is the time to accelerate from 0 Hz to the BASE FREQUENCY
(Parameter 27). This parameter is affected by the setting of TIME RANGE SELECT (Parameter 18).
20 DECELERATION TIME
This sets the deceleration rate for all of the speed reference sources (keypad, speed pot, jog, MOP,
and preset speeds). This setting is the time to decelerate from BASE FREQUENCY to 0 Hz. If the
drive is set for COAST TO STOP (setting 01 or 02 in Parameter 04), this parameter will have no
effect when a STOP command is given. This parameter is affected by the setting of TIME RANGE
SELECT (Parameter 18).
21 DC BRAKE TIME
This sets the length of time that the DC braking voltage is applied to the motor. The DC BRAKE
TIME should be set to the lowest value that provides satisfactory operation in order to minimize
motor heating. This parameter is affected by the setting of TIME RANGE SELECT (Parameter 18).
22 DC BRAKE VOLTAGE
This sets the magnitude of the DC braking voltage, in percentage of the line voltage. The point at
which the DC braking is activated depends on the selected STOP METHOD (Parameter 04):
If COAST WITH DC BRAKE is selected, braking is activated after a time delay of up to 2 seconds,
depending on the output frequency at the time of the STOP command. In this case, the DC braking is
the only force acting to decelerate the load.
If RAMP WITH DC BRAKE is selected, braking is activated when the output frequency reaches 0.2
Hz. In this case, the drive decelerates the load to a near stop and then DC braking is used to bring the
load to a final stop.
23 MINIMUM FREQUENCY
This sets the minimum output frequency of the drive for all speed reference sources except the PRESET
SPEEDS (Parameters 31-37).
When using a speed pot reference, this parameter also sets the drive speed that corresponds to the
minimum analog input (0 VDC).
NOTE: If this parameter is changed while the drive is running, the new value will not take effect
until the drive is stopped.
24 MAXIMUM FREQUENCY
This sets the maximum output frequency of the drive for all speed reference sources, and is used with
MINIMUM FREQUENCY (Parameter 23) to define the operating range of the drive.