KEB COMBIVERT F5-H User Manual

Page 7.8 - 8 COMBIVERT F5-A, -E, -H © KEB, 2012-10
Torque display and -limiting
A typical value for dS.13 is the motor rated current. In the eld weakening range, the current needed to set a
dened torque increases.
Picture 7.8.3.2.1b Limit current in the eld weakening range
Drehzahl [U/
m
Motorstrom [A]
Momentengrenzkennlinie
Beginn des
"Feldschwächbereiches"
Attention:
To assure that the speed controller can control the drive, an active current must always be available that should
not fall below 0.5 x dS.13.
Pay attention to appropriate adjustment of the torque limit and the maximum current!
7.8.3.2.2 Denitionofthelimitingcharacteristic
Starting at a certain speed, the drive cannot provide the same torque in eld weakening operation that it provi-
des in the base speed range.
If the drive is to accelerate at a constant torque limit (e.g., double the rated torque), the motor is (despite eld
weakening) physically unable to provide this torque.
The set torque can not be adjusted anymore and the drive ´hangs´ in the voltage limit (modulation factor ru.42
= 100%).Therefore, a limiting characteristic that mirrors the physical limits of the drive must be given. This limit
is depending on dS.13 „magnetization current limit“.
If no limiting characteristic is given, the user must insure that the motor is not asked to deliver an inadmissibly
high torque by choosing suitable acceleration /deceleration ramps and by appropriate selection of the load.
Parameters dr.33 and dr.39...47 serve for setting the limiting charcteristic.
Attention:
Value 0 should not be used for the torque values of the limiting characteristic. Also, the torque at the highest
speed (i.e., the last point on the characteristic) should minimally be set to the following value:
Magnetizing current limit (dS.13)
—————————————————
DSM rated current (dr.32)
M
min
= 0.37 x x DSM rated torque (dr.27)

KEB COMBIVERT F5-H Specifications

General

Brand	KEB
Model	COMBIVERT F5-H
Category	Control Unit
Language	English