Xylem HYDROVAR (HV2.1 - 3.45) - Manual (Page 48)

48
9.16 Operation Mode
MODE:
Controller
Select with the Ï and Ð buttons
Possible Settings:
Controller:
This mode should be selected if only one HYDROVAR pump is in operation and there is no
connection to any other HYDROVAR via RS485 interface.
Multicontroller:
If more than one pump should operate together via the RS485 interface (follow-up pump
control), this mode must be set.
Advantages: If the pumps are connected via RS485 interface there are the possibilities of
automatic switch over because of pumps being out of order, cyclic change of lead and lag
pumps or automatic start and stop of lag pumps following the actual demand.
Synchronous Controller:
The Synchronous Controller mode is working in the same way like the Multicontroller mode.
The only difference is that all pumps in the multi pump system are running at the same
frequency.
Advantages: In the synchronous mode the pumps are running with a better efficiency.
Actuator:
The Actuator application is only used if you have an external controller and the HYDROVAR is
used like a standard frequency converter.
In the Actuator-Mode, the internal controller is shut off, and the output frequency is
proportional to the input signal (X1/2) ⇒ 4-20 mA = 0 - f
max
.
The frequency changes with the programmed Ramps 1 and 2. The functions of low water,
thermal protection and external ON/OFF are still working.