Function library
Speed (speed control)
Setting of motor control
336
EDBCSXS064 EN 4.0
12.27.3.5
Torque control with speed limitation
If SPEED−MCTRL.NMSwt = TRUE (C7411/11), this function is activated. For the speed
limitation, a second speed controller (auxiliary speed controller) is connected.
SPEED−MCTRL.MAdd (C7431/5) operates as a bipolar torque setpoint. "torque control with
speed limitation"#
ƒ
The speed controller 1 is used to make up the upper speed limit.
– The upper speed limit is defined at SPEED−NSET.NSet (C7431/8) in [%] by N
max
(positive sign for CW rotation).
ƒ
The speed controller 2 (auxiliary speed controller) is used to make up the lower
speed limit.
– The lower speed limit is defined at SPEED−MCTRL.NStartMLim (C7431/13) in [%] by
N
max
(negative sign for CCW rotation).
ƒ
N
max
is selected via C0011.
Stop!
The upper speed limit is only to be used for CW rotation (positive values) and
the lower speed limit only for CCW rotation (negative values); Otherwise the
drive may accelerate in an uncontrolled way.
Note!
The value at SPEED−MCTRL.NegLoMLim (C7431/3) is negated in the "Speed"
function block.
