Danfoss VACON 100 FLOW Series Application Manual page 257

VACON® 100 FLOW
Application Guide
RPM
f
max
f
min
P1 P2
Illustration 90: 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).
RPM
f
max
f
min
P1 P2
Illustration 91: Control in the Multifollower Mode
P1 The pump controls the system.
P2 The pump follows the speed of P1.
2 = Multimaster
The Multimaster 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.
Danfoss A/S © 2023.08
B
P3
A
P3
P3
A
t
t
The pump follows the speed of P1.
Curve A shows the auxiliary pumps that follow the
speed of pump 1.
AB298035655957en-000201 / DPD01083 | 257
Parameter Descriptions