Xylem HYDROVAR HV 4.150 / 4.185 / 4.220 - Manual (Page 33)

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If the HYDROVAR is used as a BASIC Inverter in a multi-pump system, the internal interface
on the power unit is used for the serial RS-485 connection to the other HYDROVAR units in
the system. (Be careful: Internal interface is not available in SINGLE Inverter configuration!)
X2 RS485-Interface – Power Unit
SIO - Internal SIO-interface: SIO-
SIO + Internal SIO-interface: SIO+
X2/
GND GND, electronic ground
Internal interface
for multi-pump-systems
……. Parameter not available for a HYDROVAR SINGLE Inverter
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 Inverter). For the
connection to each HYDROVAR via the RS-485 interface the terminals X2/1-3 on the power
unit can be used twice. Or the terminals X4/4-6 on the control card can be used.
RS485 – internal interface
Mechanical connection of the terminal:
- Use recommended cable type (see chapter 9.3)
- Strip the end of the used wire (about 5 … 6mm)
- push down the orange wedges by using a small screwdriver
- insert the stripped wire
- remove the screwdriver to fix the wire
- To remove, push down the orange wedges and pull out the wire!
Connection example using one MASTER - and three BASIC - Inverters:
S
S