Lenze E82xVxxxKxxxxx - Manual (Page 515)

Application examples
Power control (torque limitation)
15
l
515 EDS82EV903 EN 3.0
15.6 Power control (torque limitation)
The power control (torque limitation) generates a constant mass flow when moving
masses which change their specific weight, usually air exposed to different temperatures.
Torque limit and speed setpoint are selected for the controller. The torque limit will not be
exceeded because the speed is automatically adapted if the specific weight changes. The
speed setpoint must be set in a way that it does not limit the speed adaptation.
Control mode "Sensorless torque control" (C0014 = 5):
With sensorless torque control, a constant torque is preselected. A defined speed limit
must not be exceeded (speed limitation).
Application−specific configuration
ƒ Basic settings.
ƒ Control mode selection: C0014
¹ 5! (¶ 255)
ƒ Torque limit value configuration: Assign C0412/6.
ƒ Speed setpoint configuration: Assign C0412/1.
)
Note!
ƒ Set the max. output frequency C0011 for the max. permissible speed. Thus
the speed does not have a limiting effect, the drive is constantly running at
the set torque limit.
ƒ The torque limit can be indicated under C0047.
ƒ Possibilities to select speed and torque limits: (
¶ 296 ff)
ƒ With standard I/O, the speed setpoint must be selected via PC, keypad, JOG
frequency or the function "Motor potentiometer" because there is only one
analog input available.
ƒ Acceleration time and moment of inertia require a torque reserve.
ƒ Power control should not be used with group drives.
8200
Luft/Abluft
schwer kalt
warm
M
f
leicht
Lüfter
Massen-
strom
m = konst.
Fig. 15−6 Power control principle example: Fan
0
Cold, heavy air
1 Warm, light air
2
Fans
3 Mass flow m = constant
4 M = Moment
5 f = Frequency
8200
8200 motec or 8200 vector