Pump Control Quick Guide
42
PID Display units set-up (related function codes -> E40, E41)
In order to display the values of PID control (SV, PV, MV, etc.) in engineering units, adjustment of the
value in E40 to the sensor range is needed.
So, the user will be able to enter the Command Value in user units, instead of percentage of PID.
For example, if the transducer in use is 4-20 mA (160 bars), the function code E40 must be set to 160.
If the transducer in use is 4-20 mA (10 bars) the function code E40 must be set to 10.
The feedback value, in bars, could be seen in menu
3_11: PID Feedback Value
.
The process command value is displayed in menu
3_10: PID Process command
.
If you are adjusting the inverter by means of the TP-E1 keypad, it is recommended to set E52 to “2”, in
order to be able to access all the inverter menus.
E40
4 mA 20 mA
E41
Start-up and switching motors sequence (related function codes -> J30, J32)
There are two methods to try to extend the pumps’ lifetime in Multi-regulated pump control systems
1. Controlling the order of connection of the pumps, by means of the data in function code
(Motor
Switching Order)
.
J30 = 0 FIXED MOTOR SWITCHING ORDER
The inverter will activate the pumps in ascending order (PUMP 1 –> PUMP 2 –> PUMP 3 –> PUMP 4) and it will
deactivate it in descending order (PUMP 4 –> PUMP 3 –> PUMP 2 –> PUMP 1).
J30 = 1 AUTOMATIC MOTOR SWITCHING ORDER
The inverter will take into account the accumulated working times of each pump.
In this way, the first pump to activate is the less used pump, and the first to be disconnected is the more used pump.
2. The second method is to rotate the pumps.
After the time specified by function code J32 data
(Periodic switching time for motor drive)
, the
inverter disconnects the pump with major accumulated run time and connects the pump with the
minor accumulated run time.
J32 = 0
The inverter does not switch the pumps
J32 = 0.1 a 720.0 h
The inverter switches the pumps after the time in J32’s data (in hours)
J32 = 999
The inverter switches the pumps every 3 minutes. (Not recommended. Only for tests).
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