Lenze EVF9383 - Manual (Page 253)

Configuration
Function blocks
Internal motor control with V/f characteristic control (MCTRL1)
8
8.2
8.2.6
l
8.2−37 EDSVF9383V EN 7.1−04/2012
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
 ‚ ƒ „
C0036
C0019
9300vec091
Fig. 8.2−18 Signal characteristic with automatic DC injection braking
0 Speed setpoint (e. g. AIN−OUT)
1 Actual speed value of the motor (e. g. MCTRL−NACT)
2 Controller output current (e. g. MCTRL−IACT)
3 Pulse inhibit (e. g. DCTRL−IMP)
4 DC injection braking is active (MCTRL−GSB−OUT)
MCTRL−GSB−OUT = HIGH: Function is active
MCTRL−GSB−OUT = LOW: Function is not active
 The motor rotates with the preset speed. The current adjusts itself as a
function of the load 5.
‚ With a speed setpoint < speed threshold (C0019), DC injection braking is
activated. Pulse inhibit c is set. The motor coasts.
ƒ The pulse inhibit is deactivated and the DC braking current set in C0036 is
injected
„ 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.