Operating Modes
Parameter manual b maXX BM3000
Document no.: 5.12001.07 Baumüller Nürnberg GmbH
660
of 820
4.8
4.8.12 Operating Mode U-f Characteristic
The b maXX 3000 drive controller allows the operation of motors according to U-f speci-
fication. Thereby simple applications can be realized at which the motor must be run at a
set speed. No encoder is needed and several motors can be operated at the same con
-
verter. For motor protection the U-f operation mode includes an overcurrent protection.
The operation is intended for simple applications with asynchronous motors.
Figure 213: U-f characteristic
The settings take place in functional block 166. With parameter maximum voltage
(
Z166.13–) and Frequency Umax (Z166.12–) the slope of the straight line can be param-
eterized. Additionally the voltage is kept constant from the maximum frequency on. Via
the zero voltage (
Z166.5–) a voltage can be set at frequency 0 Hz.
Three different operation modes are possible in general; U/f characteristic with and with-
out overcurrent protection and a operation with the compensating controller for the accel-
eration (see chapter Z4.8.12.1–).At operation without overcurrent protection the
controller is switched off if the maximum current of the converter has been reached, only;
at operation with overcurrent protection the acceleration ramp of the maximum current is
stopped.
Additionally, at all operation modes a slip compensation is possible or an additional speed
controller if an encoder is connected. In
ZFig. 214– the U/f operation with slip compen-
sation is presented. The speed controller is activated via bit 4 of Z166.1– so that not the
additional frequency from the slip is added but the output. It reduces the acceleration in-
sofar.
0 20 40 60 80 100
0
20
40
60
80
100
120
140
160
180
200
U (P166.13)
max
f (P166.15)
Umax
U (P166.5)
0
Voltage [V]
Frequency [Hz]
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