Configuration
Function blocks
Internal motor control with V/f characteristic control (MCTRL1)
8
8.2
8.2.6
8.2-45
EDSVF9333V EN 3.0-06/2005
Function procedure 2:
ƒ If you define a speed setpoint > speed threshold (C0019) before the
hold time elapses, DC-injection braking is deactivated and the drive
follows the speed setpoint. If the speed falls below the threshold again,
DC-injection braking is reactivated and the hold time is restarted.
0
1
5
2
3
4
C0036
C0019
9300vec091
Fig. 8.2-20 Signal characteristic with automatic DC injection braking
Speedsetpoint(e.g.AIN-OUT)
Actual speed value of the motor (e. g. MCTRL-NACT)
Controller output current (e. g . MCTRL-IACT)
Pulse inhibit (e. g. DCTRL-IMP)
DC injection braking is active (MCTRL-GSB-OUT)
MCTRL-GSB-OUT = HIGH: Function is active
MCTRL-GSB-OUT = LOW: Function is not active
c The m otor rotates with the preset speed. The current adjusts itself as a
function of the load .
d With a speed setpoint < speed threshold (C0019), DC injection braking is
activated. Pulse inhibit is set. The motor coasts.
e The pulse inhibit is deactivated and the DC braking current set in C0036 is
injected
f DC -injection braking is deactivated as soon as the speed setpoint exceeds
the speed threshold (C0019). The motor is accelerated to the defined speed
setpoint and kept there.
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