3. Product description
28
Festo P.BE-CMMP-AS-3A-HW-EN 0708NH
Behaviour under normal operation and control properties:
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In operation, the power consumption of the CMMP-AS servo positioning controller is
monitored via the PFC stage. The mains current is regulated by an analogue control
circuit so that the shape of the curve reflects that of the mains voltage sinewave and
the phase shift is 0°. The amplitude is adjusted according to the specified effective
power.
-
A higher-level digital controller regulates the intermediate circuit voltage to an average
value of approx. 360 VDC. To relieve the relatively sluggish voltage regulation under
changing loads (acceleration/braking of the drive), the power delivered to the motor
from the CMMP-AS servo positioning controller is measured and used to pre-control
the PFC stage.
+
-
~
~
3 phase
power
stage
M
3 ~
microcontroller
voltage
controller
motion controller
IC for power factor
correction
L
D
C
u_q
i_q
PWM
U_Zk
i_v
i_u
T8
I_in
U_in
100V ... 230V AC
+/- 10%
F
motor
feedback
Fig. 3.1 Schematic structure of the PFC stage
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The control system encompasses the following:
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Digital control of the intermediate circuit voltage to an average
value of approx. 360 VDC
-
Analogue control of the mains input current
-
Maintenance of a sinewave mains current under stationary load
conditions
-
Operation with cos > 0.97 at rated operation (at the rated
power of the PFC stage)
-
The parameterisation program can be used to switch the PFC control on or off. When
the PFC is deactivated, the intermediate circuit behaves like a normal intermediate
circuit with an upstream bridge rectifier.
-
The intermediate circuit voltage is usually regulated to a constant average value that,
under stationary load conditions, is independent of the specified effective power of
the motor.
Summary of Contents for CMMP-AS-C2-3A
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