Lenze SCF frequency inverter - Manual (Page 44)

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Lenze 13466146 EDBSF01 v24 EN
4 Commissioning
P19 ACCELERATION TIME
This parameter sets the acceleration rate for all of the speed reference sources (keypad, speed pot,
4-20 mA, 0-10 VDC, jog, MOP, and preset speeds). This setting is the time to accelerate from 0 Hz to
the BASE FREQUENCY (Parameter 27).
P20 DECELERATION TIME
This parameter sets the deceleration rate for all of the speed reference sources (keypad, speed pot,
4-20 mA, 0-10 VDC, 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.
P21 DC BRAKE TIME
This determines 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.
P22 DC BRAKE VOLTAGE
This sets the magnitude of the DC braking voltage, in percentage of the nominal DC Bus voltage
(DC Bus = input AC voltage X 1.414). The point at which the DC braking is activated depends on the
selected STOP METHOD (Parameter 04):
If COAST WITH DC BRAKE is selected, the DC 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 the DC braking is used to bring the
load to a final stop.
P23 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 0-10 VDC or 4-20 mA analog speed reference signal, this parameter also sets the drive
speed that corresponds to the minimum analog input (0 VDC or 4 mA).
NOTE
If this parameter is changed while the drive is running, the new value will not take effect
until the drive is stopped.
P24 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.
When using a 0-10 VDC or 4-20 mA analog speed reference signal, this parameter also sets the drive
speed that corresponds to the maximum analog input (10 VDC or 20 mA).
NOTE
• On drives equipped with the High Output Frequency option, this parameter can be set
up to 999.9 Hz, depending on carrier frequency (parameter 02).
• If this parameter is changed while the drive is running, the new value will not take
effect until the drive is stopped.