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PROGRAMMING
GUIDE
SOLARDRIVE
PLUS
51
/
107
2.6.2.
Dry-run Control Menu
2.6.2.1. Overview
Thanks to the Dry-run detection function, the drive is capable of detecting when the pump is working under
Dry-run conditions or when cavitation is about to occur.
The Dry-run Control algorithm is based on electrical measurements of the motor and does not require
pressure measurements, as these are not always available and, moreover, are dependent on the application.
This allows the Dry-run Control to be kept activated even in speed control only.
The reference variables for the Dry-run Control conditions may be selected via parameter
P710:
-
Electric power
-
Power factor (
cosphi
)
The latter guarantees greater sensitivity and accuracy.
The user may choose the most suitable measurement based on the type of application.
These values are computed and displayed runtime and are part of the custom measurements to be displayed
on the keypad for easier calibration.
2.6.2.2. Calibration
The Dry-run zone is to be defined based on the plant and the characteristic curves of the connected pump.
As shown in the figure below, the zone is limited by 2 points at two different operating frequency values.
Figure 6: Dry-run zone
The two Dry-run points are set in parameters
P710a-P710b
and
P710c-P710d.
Parameter
P711
inhibits the Dry-run detection below a preset operating frequency.
The calibration guidelines for two different applications are given below:
-
Stop water flow from the plant (valve closure).
-
Reach maximum speed and set
P710c
.
-
Set
P710d
to a value lower than the selected Dry-run measurement (electric power or power factor).
-
Repeat the steps above by adopting a low speed reference.
Dry-run zone