Lenze TCF Series - Manual (Page 48)

P17 ROTATION DIRECTION
01 FORWARD ONLY: The drive will only allow rotation in the forward direction .
However, JOG REVERSE (Parameter 12) will still operate even if FORWARD
ONLY is selected .
02 FORWARD AND REVERSE: The drive will allow rotation in both directions .
P18 MOTOR OVERLOAD TYPE
01 SPEED COMPENSATED: Below 40 Hz, the continuous current rating is
reduced to protect standard motors that cannot cool themselves effectively at
low speeds . From 40 Hz to 0 Hz, the allowable continuous current decreases
from 100% to 62% .
02 NO COMPENSATION: Full rated current is available throughout the speed
range . Only use this setting if the motor is rated for low speed operation under
high loads .
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, -10 to +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, -10 to +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 . If DC
BRAKE TIME is set to 999 .0 SEC (the maximum value), the DC braking will be continuous
(the DC braking will be on whenever the drive is in a STOP state) . 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) .
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