Fig. 92: Control in the Single drive mode
P1 The pump that controls the system
B The auxiliary pumps connected to the
mains (direct on-line)
1 = MULTIFOLLOWER
The Multifollower mode controls a system that has the maximum 8 pumps that can change
speed. Each pump is controlled by a drive. The internal PID controller of the drive controls all
the pumps.
1 of the pumps always controls the system. When the pump in control sees that it is
necessary to have more capacity (operates at the maximum frequency), the pump uses the
communication bus to make the next pump to start. The next pump increases speed and
starts to operate at the speed of the pump in control. Auxiliary pumps operate at the speed of
the pump that controls the system.
When the pump that controls the system sees that there is too much capacity (operates at
the minimum frequency), it makes the started pump to stop. If no auxiliary pumps operate
when the pump in control sees overcapacity, the pump goes to the Sleep mode (if the Sleep
function is enabled).
Fig. 93: Control in the Multifollower mode
P1 The pump controls the system.
P2 The pump follows the speed of P1.
VACON · 326 PARAMETER DESCRIPTIONS
10
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