ABB UNITROL 1020 - Page 50

Chapter 3 - Device Overview 
42 3BHS335648 E82 UNITROL 1020 User Manual
Indirect PF or VAR
control
Indirect PF/VAR enable 
Dead band of Q reg [%]
On Delay [sec]
AUTO Ramp rate [%/s]
PF indirect
PF or VAR controller can be configured for
direct or indirect control
In case of indirect control the PF/VAR is
regulated by increasing and decreasing the
voltage setpoint with a defined ramp rate for
AUTO mode.
Voltage SP is only changed when an error
of the VAR/PF regulator is higher than the
defined dead band.
Note: In PF mode the PF SP is calculated to
VAR SP.
On Delay will define the reaction time of the
indirect regulator. If the network voltage
changes, the voltage SP is changed after a
defined delay time. If SP is changed no
delay is given.
AUTO Ramp rate PF indirect will define
ramp rate just in case indirect PF regulator
is active
Manual
Field current control and
Ie Limiter
Proportional Gain Vp
Integration Time Ta [s]
Vp
1257
[rad/s]
1/Ta
Gain
[p.u.]
All parameters should be stored in the EEPROM non-volatile memory after they are
configured. Store to EEPROM can be done via CMT1000, Panel or Remote Access. For
more information refer to the appropriate sections.
Expert Tuning
Derivator gain Kb:
By default Kb is set to 3. This gives a derivator gain of 4 x Vp. The parameter can be set
between 1 and 50 which will give a derivator gain between 2 x and 51 x Vp.
Variable kceiling, Upower @ Noload:
In case of variable input voltage, UNITROL 1020 will adjust the kceiling factor
automatically by setting the parameter Upower @ Noload. The kceiling factor will be
adjusted depending on the Upower input. By default the Upower @ NoLoad is set to 0 V,
which will lead to fix kceiling.
Variable kceiling, Kc Freq Dep
In case of variable machine frequency, UNITROL 1020 will adjust the kceiling factor
automatically by checking the check box. The kceiling will be adjusted linear to the
measured frequency, where the nominal frequency is taken as base.
Max PWM when boosting
When this function is enabled, the AVR will apply 100% PWM during undervoltage.
Thresholds are defined by the boosting setting.