Xylem IM223 R04 Hydrovar Pump Control - Manual (Page 8)

8
application example
Booster sets up to 6 pumps where only one pump is speed controlled by the HYDROVAR and the others are
fixed speed (1 HYDROVAR Master Inverter+5 fixed speed). This should be the standard configuration when
the additional Relay Card is used.
3.2.4 cascade serial and cascade synchron
In these modes each of the pumps is equipped with a HYDROVAR unit. All units are connected and
communicate via the RS485 interface.
At least one Master controller is used. The other pumps can be controlled by Basic or Master drives. The
Master controller continually reads the status and failures of the Basic controllers. All failures are indicated on
the master unit, including the date and time.
The Master controller has complete control of all pumps in the system, including automatic alternation of the
lead and lag pumps, which provides even wear and achieves even operating hours for each pump.
If the control card of a Master controller fails, each of the Basic controllers can be manually started by an
external switch (manual operation) for “emergency operation” of the system.
application example
Each pump, (up to 8 pumps), is equipped with a HYDROVAR unit. At least one Master controller will be
connected to up to seven Basic controllers. All units are connected via the serial interface (RS485).
The combination of the different HYDROVAR units that are used in a multi-pump-system depends on the
system requirements (i.e. in a 6 pump system 2 or more Master controllers can be used to increase reliability,
and up to 4 Basic controllers
without control card.
Minimum requirement: 1
Master controller and the other
pumps equipped with Basic
controllers.
product oVerVieW