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Product Overview
This configuration is a cost effective alternative compared with other solutions using VFD’s on each pump, but
additional equipment is required, and you only have fixed speed control of the pumps.
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
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