11
extended up
to 8 pumps
RS 485
connection
3.2.4 Cascade Serial
In this mode there are various possibilities to combine the different versions of the
HYDROVAR, which will be explained on the following pages.
In general each of the pumps is equipped with a HYDROVAR unit. All units are connected
via the RS485 interface and are communicating via standard MODBUS-Format (fixed with
9600 Baud, RTU, N81).
To realise a fully controlled system at least one “Master Inverter” is needed, the other
pumps could be fitted just with a “Basic Inverter”.
The controller in the “Master Inverter” is informed about the status and a possible failure
of the “Basic Inverters” all the time. All possible failures will be indicated on the Master
unit, including also the date and real time when the failure happened.
The complete control will be done via the “Master Inverter” every time, but also an
automatic change over of the lag pumps to provide even wear and achieve even operating
hours will be possible .
If the Control Card of a “Master Inverter” fails, each of the “Basic Inverters” can be
manually started by an external switch (manual operation) in order to ensure an
“emergency operation” of the system.
Application Example
Each pump of the system (extended up to 8 pumps) is equipped with a HYDROVAR unit (at
least one “Master Inverter” and the others can be “Basic Inverters” in order to ensure a
proper control of the system) which are connected via the serial interface.
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 “Master Inverters” can be
used due to safety reasons and 4 “Basic Inverters” without Control Card – or just any other
configuration)
Minimum requirement: 1 “Master Inverter” and the others equipped with “Basic Inverters”
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