B&R 8I84T200037.01P-1, User Manual

Page: 159 / 405

Programming guidelines
ACOPOSinverter P84 User's Manual 2.10 159
2.8.8.5 [ENA system]
ENA system is a control profile for rotary machines with unbalanced loads.
It is primarily used for oil pumps. The applied principle of operation:
•
Allows operation without braking resistance
• Reduces the mechanical load of the rod
•
Reduces power fluctuations
• Reduces the energy consumption by improving the electrical power/current ratio
2.8.8.5.1 [P component ENA]
This setting is used to make a compromise between the reduced energy consumption (and/or power fluctuations)
and the mechanical load to be achieved on the rod.
By reducing the current fluctuations and increasing the current at the same average speed, energy is saved.
2.8.8.5.2 [I component ENA]
This setting is used to smooth the DC bus voltage.
Start the machine with low integral and proportional gain (proportional 25% and integral 10%), to avoid an over-
voltage fault in the absence of a braking resistor. Check whether these settings are suitable.
2.8.8.5.3 Adjustments recommended during operation:
• To eliminate the braking resistance and to increase the DC bus voltage as a result:
Show the speed of the machine on the graphic display terminal
Reduce the integral gain value until the machine speed falls. If this point is reached, increase the integral
gain until the machine speed stabilizes.
Check the stability of the DC bus voltage with the graphic display terminal or an oscilloscope.
• To save energy:
The (gradual) reduction the proportional gain can lead to greater energy savings through the reduction
of the maximum value of the line current. However, it increases the fluctuations in speed and thus the
mechanical load.
The aim is to identify the settings that enable energy saving and minimize the mechanical load.
If the proportional gain is reduced, a readjustment of the integral gain is required in order to avoid an
overvoltage fault.
Note:
Check after completion of the adjustments that the auxiliary pump starts correctly. If the setting [I
component ENA] is too low, this can lead to an insufficient torque at the start.
2.8.8.5.4 [Reduction ratio]
This setting corresponds to the ratio of motor speed before transmission to speed after the transmission. This
parameter is used to access the average speed in Hz and the speed of the machine in user-defined units (for
example, in beats per minute) on the graphic display terminal. For these values to be displayed on the graphic
display terminal, in the menu [MONITOR] , you must select (SUP-) .