Xylem IM223 R04 Hydrovar Pump Control User Manual
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connection example
external switch to enable the
solo run (Hand Mode)
example:
low water or other
emergency off switch
thermistor
(mounted in the motor terminal box)
recommended connections of external protective devices:
Basic drive
Thermistor
X1/PTC
Emergency switch
X1/PTC
As described above
Low water switch
X1/PTC
Master drive
Thermistor
X1/PTC
As described above
External release
X3/7-8
On the control card
Low water switch
X3/11-12
When the HYDROVAR is used as a Basic drive in a multi-pump system, the X2 terminals on the power unit are
used for the serial RS-485 connection to the other HYDROVAR units in the system. (Note: Internal interface is
not available on Single Inverters!)
x2 rs485-interface – power unit
x2/ sio - Internal SIO-interface: SIO-
Internal interface
sio+ Internal SIO-interface: SIO+
for multi-pump-systems
Gnd GND, electronic ground
……. Terminals not available for HYdroVar single drives
The internal rs-485 interface on the power unit is used for the communication between up to 8 HYDROVARs
in a multi-pump system (minimum 1 Master drive). Use the same terminals to continue on to the next
HYDROVAR if required. Terminals X4/4-6 can also be used for RS-485 communication on all Master drives.
X2
GND
SIO +
rs485 – internal interface
SIO -
X1
sl
sl
ptc
ptc
SW 1
Auto
Manual
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