Delta Electronics AC Motor Drive VFD-EL - Manual (Page 150)

Chapter 4 Parameters|
Revision August 2008, 2ELE, V1.02 4-107
Example: suppose that the set point of constant pressure control of a pump is 4kg, Pr.10.22 is
set to 5%, Pr.10.23 is set to 15 seconds. It means that deviation is 0.2kg (4kgX5%=0.2kg), i.e.
when feedback value is higher than 3.8kg for a time exceeding 15 seconds, the AC motor
drive will decelerate to stop (this deceleration time will act according to Pr.01.12). When the
feedback value is less than 3.8kg, the AC motor drive will start to run.
10.24 Offset Level of Liquid Leakage Unit: 1
Settings 0 to 50% Factory Setting: 0
In the constant pressure status, when the liquid leakage is higher than Pr.10.24 X PID set
point, the AC motor drive will start to run.
It is used to prevent frequent run/stop operation due to liquid leakage.
10.24
set point
feedbac k v al ue
Offset level of liquid leakage
10.25 Liquid Leakage Change Detection Unit: 1
Settings 0 to 100% (0:disable) Factory Setting: 0
10.26 Time Setting for Liquid Leakage Change Unit: 0.1
Settings 0.1 to 10.0 sec (0:disable) Factory Setting: 0.5
When the change of feedback value is less than the settings of Pr.10.25 and Pr.10.26, it
means that the liquid is leaking. When the system is in constant pressure status, the AC motor
drive will start to run if the feedback value is higher than these two settings.
set point
feedbac k v al ue
10.25
10.26