ITEM C 1-Series - Behaviour During Normal Operation and Control Characteristics; Figure 2: Schematic Setup of PFC Stage

Product description
Page 32
3.2.1.2 Behaviour during normal operation and control characteristics
During operation the PFC stage controls the power input of the item servo positioning controller C 1-Series from the supply.
Based on an analog closed-loop control the mains current is regulated to a sinusoidal waveform with a phase shift near to 0 °.
The effective amplitude is adjusted according to the demanded input power
A superimposed digital closed-loop control adjusts the DC bus voltage to an average value close to 380 VDC. To relieve the
voltage control that is relatively sluggish, during load changes (acceleration/deceleration of the drive) the output/input power
delivered from the item servo positioning controller C 1-Series to the motor is measured and used for the pre-control of 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_vi_u
T8
I_inU_in
100V ... 230V AC
+/- 10%
F
motor
feedback
Figure 2: Schematic setup of PFC stage
The control system includes the following values:
digital control of the DC bus voltage to an average value of 380 VDC
analog control of the input mains current
Keeping of a sinusoidal mains current under stationary load conditions
cosϕ > 0.97 at nominal operation (at rated output power of the PFC stage)
By use of the parameterisation program item Motion Soft
®
the PFC stage (Parameters/Device parameters/PFC) can be
switched on and off. With deactivated PFC the DC bus behaves like a normal DC bus with a rectifier bridge
Under stationary load conditions the DC bus voltage is regulated to a constant average value, which is independent from the
actual power transferred to the motor.