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System Manual – MOVITRAC® 07
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Explanation of the parameters
Parameters
VFC & DC BRAK. / V/f & DC BRAKING: With DC braking, the asynchronous motor brakes by means of a current injec-
tion. In this case, the motor brakes without a braking resistor on the inverter. The following figure shows the braking
torque profile when the braking current is the same as the motor rated current.
During the braking process, the inverter injects a constant current with a rotating field frequency of 5 Hz. The braking
torque equals 0 at a standstill. A greater braking torque acts at a slower speed; the braking torque drops as the speed
increases. The braking time, and thus the duration of the braking current, depends on the load on the motor. DC braking
stops when the rotating field frequency of the motor is 5 Hz. The motor stops with the rapid stop ramp. Motor rated cur-
rent is used for the current injection. In all cases, the inverter limits the current to max. 125 % I
N
. See Brake function for
information about the brake control system.
Important!
It is not possible to enable a directed stop or to observe a certain ramp using DC braking. The principal application is to
reduce drastically the coasting of motors.
The following figure shows the braking sequence.
n
1
=
Setpoint speed
[1] = Enable
t13 = Rapid stop ramp
t
B
=
Braking phase
VFC &FLY.START (only in units with expanded functions or LOGODrive units): The flying restart circuit makes it possi-
ble to lock the inverter onto a rotating motor. In particular with drives which are not braked actively, which run on for a
long time or which are turned by a flowing medium, e.g. pumps and fans. The maximum flying start time is approx. 200
ms.
Automatic adjustment P320 is deactivated in FLYING START operating mode.
n
1
=
Setpoint speed
n
M
= Motor speed
[1] = Enable
The flying restart circuit does not function if there is an output filter connected to the inverter.
Important!
Do not use the flying restart circuit in hoist applications.
No.
OP Name
Description
1
0
0
5 Hz
f
f
N
M/M
N
P6..
P60.
P600
Содержание MOVITRAC 07
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