Configuration
Function blocks
Internal motor control with V/f characteristic control (MCTRL1)
8
8.2
8.2.6
8.2-44
EDSVF9333V EN 3.0-06/2005
Function procedure
Automatic DC injection braking provides two function procedures, each
with a different reaction of the controller. The parameter setting is identical
for both function procedures.
Function procedure 1:
ƒ After the hold time has elapsed (C0107), the controller automatically
sets pulse inhibit .
0
1
5
2
3
4
C0107
C0036
9300vec090
Fig. 8.2-19 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 After the hold time (C0107) pulse inhibit is set
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