Chapter 6 – Firmware Description
6-4
ACA 635 IGBT Supply Sections
If the network frequency is constant, power is directly proportional to
the torque. By controlling torque, power transferred between the ISU
and the network can be set to a value that keeps the DC link voltage
constant. These basic facts enable the use of the DTC method which
relies on control of flux and torque.
The main difference between DTC and conventional PWM is that
torque is controlled at the same time level as power switches (25
m
s).
There is no separate voltage and frequency controlled PWM
modulator. All selections of the switches are based on the
electromagnetic state of the ISU. This kind of control method can be
realised only by using a high speed signal processing technology. The
digital signal processor Motorola 56002 is used in the ACS 600 product
family to achieve sufficient speed.
Identification Routine
The ISU adapts itself to the supply network and no data concerning the
network conditions is to be set. The converter rating plate data is
downloaded in the software package.
When the ISU is connected to the network for the first time a
identification routine must be completed. The identification routine is
executed each time after the NAMC board is powered.
The identification routine can be executed manually also after next
start (without power up) by setting the Parameter 99.07 LINE SIDE ID
RUN to YES and pressing the Control Panel Start key. This can be
done if there is doubt that the automatic identification routine has failed,
or an automatic routine is not desirable as it takes approximately 5
seconds and requires that the motor is not loaded.
The references 2.07 DC REF INITIALIZ and 150.01 FLUX REF USED
NOM are calculated from internal DC link voltage measurement during
the identification routine. If Par. 2.07 DC REF INITIALIZ exceeds the
trip limit (
Ö
2
×
the limit given in the description of Fault NET VOLT FLT
)
a fault is set (Parameter 9.11 bit 9 NET VOLT FLT). If the reference
value is within allowed limits the procedure goes on further to define
the frequency of the network (50 Hz or 60 Hz) and the phase order.
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