KSB PumpDrive 2 - Multiple Pump Configuration; Multiple Pump Configuration in Closed-Loop Control Mode; Parameters for Sensorless Flow Rate Estimation

8 Commissioning/Shutdown
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PumpDrive 2
Table56: Parameters for sensorless flow rate estimation
Parameter Description Possible settings Factory setting
3-9-8-1 Flow Rate Estimation ▪ ON
▪ OFF
ON
3-9-8-2 Attenuation of Flow Rate Estimation
Time constant for attenuation of flow rate
estimation. Higher values will result in
greater attenuation.
0 … 600 s 5s
3-6-1 Type of Control
Selecting the control method. The
controller is deactivated when OFF (Open-
loop Control) is selected.
▪ OFF (Open-loop Control)
▪ Discharge Pressure
▪ Suction Pressure
▪ Differential Pressure
▪ Differential Pressure
(Sensorless)
▪ Flow Rate
▪ Flow Rate (Sensorless)
▪ Temperature (Cooling)
▪ Temperature (Heating)
▪ Suction-side Level
▪ Discharge-side Level
Dependent on pump
8.7.2 Multiple pump configuration
8.7.2.1 Multiple pump configuration in open-loop control mode
Open-loop control mode is selected via the Type of Control parameter(3-6-1) for
pumps in automatic mode (AUTO key). In open-loop control mode, all running
pumps are operated at the specified speed. The number of running pumps is defined
via the Maximum Number of Pumps Running parameter (3-7-2). The speed is
specified using the Control Value (Open-loop Control) parameter (1-3-3)
(ðSection8.7.1.1.2,Page73) or via an analog input (ðSection8.7.1.1.1,Page72) .
Table57: Parameters for multiple pump configuration in open-loop control mode
Parameter Description Possible settings Factory setting
3-6-1 Type of Control
Selecting the control method. The
controller is deactivated when OFF (Open-
loop Control) is selected.
OFF (Open-loop Control) OFF (Open-loop Control)
3-7-2 Maximum Number of Pumps Running
Maximum number of pumps running
simultaneously in a multiple pump
configuration
0…6 1
1-3-3 Control Value (Open-loop Control)
Configurable control value for speed in
open-loop control mode
Minimum to maximum speed of
motor
500
8.7.2.2 Multiple pump configuration in closed-loop control mode
8.7.2.2.1 Role of the drives in multiple pump configurations
In multiple pump configurations, one of the frequency inverters assumes the function
of master control. The master control device starts and stops pumps and manages
open-loop and closed-loop control of the multiple pump system. All signals required
to control the system must be connected to the master control device. The master
control role is assigned to a frequency inverter via the Role in Multiple Pump System
parameter (3-7-1).