Pump Control Quick Guide
6
Necessary digital outputs Do we need the optional relay card installed?
Single pump control 0 NO
When a regulated pump is being controlled, it’s necessary to consider certain parameters in order to allow
the inverter to control the pump’s start-up and stop, controlling speed to maintain the desired pressure,
etc.
The schematic to implement control by only 1 pump by means of
inverter, is as follows:
Please note the pressure transducer is connected to the inverter’s analog input C1 (4-20 mA)
L1
L2
L3
Y1
Y2
Y3
Y5A
Y5C
30A
30B
30C
U
V
W
REGULATED
PUMP
SINGLE PUMP CONTROL
CMY
PLC
CM
11
C1
Pressure transducer
4-20 mA (Vcc 24V)
-
+
P
E
Figure 1.1: control schematic for 1 pump only
By means of the keypad, a digital input or an analog set point, the desired pressure can be selected. Once
this pressure is set, inverter will modify pump’s speed between a minimum (J19 = F16 (Hz)) and a
maximum (J18=F15=F03 (Hz)) frequencies, in order to stabilize the pressure.
To work in this way, the integrated PID control must be enabled (J01) and adjusted properly. Then, the
inverter’s response should be the required action to control the application.
PID’s response can be modified by means of parameters J03 and J04 (Proportional gain and Integral time).
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