3 ~
PT
M1 M2 M3 M8
M1
M2
M3
M8
Start/Stop
Fig. 91: Multidrive configuration (PT = pressure sensor)
P3.15.1 MULTI-PUMP MODE (ID 1785)
Use this parameter to select the configuration and the control mode of the Multi-pump
system. The Multi-pump function lets you control a maximum of 8 motors (that is, pumps,
fans, compressors) with the PID control.
0 = SINGLE DRIVE
The Single drive mode controls a system that has 1 pump that can change speed and the
maximum of 7 auxiliary pumps. The internal PID controller of the drive controls the speed of
1 pump and gives control signals with relay outputs to start or stop the auxiliary pumps.
External contactors are necessary for the switch of the auxiliary pumps to the mains.
1 of the pumps is connected to the drive and controls the system. When the pump in control
sees that it is necessary to have more capacity (operates at the maximum frequency), the
drive gives the control signal with the relay output to start the next auxiliary pump. When the
auxiliary pump starts, the pump in control continues to control and starts from the minimum
frequency.
When the pump that controls the system sees that there is too much capacity (operates at
the minimum frequency), the pump makes the started auxiliary pump to stop. If no auxiliary
pumps operate when the pump in control sees the overcapacity, the pump goes to the Sleep
mode (if the Sleep function is enabled).
PARAMETER DESCRIPTIONS VACON · 325
LOCAL CONTACTS: HTTP://DRIVES.DANFOSS.COM/DANFOSS-DRIVES/LOCAL-CONTACTS/
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