Xylem HYDROVAR HV 4.150 / 4.185 / 4.220 - Manual (Page 47)

47
Control Terminals
All control cables connected to the control-unit have to be screened (See chapter 9.3
recommended cable types).
External volt free contacts must be suitable for switching <10 VDC.
NOTE:
If unscreened control cables are used, signal interference may occur and
could interfere with incoming signals and the function of the HYDROVAR.
Don’t connect the ground of the control card to other voltage potentials.
All electronic ground terminals and GND of the RS 485-interface are connected internally.
X3 Digital and Analogue I/O
1 GND, electronic ground
2 Actual value input sensor 1 0-10VDC or 0-20mA / 4-20mA [Ri=50Ω]
3 Power supply for external sensors 24VDC, max. 100mA
4 User SIO-Interface: SIO-
5 User SIO-Interface: SIO+
6 GND, electronic ground
User Interface for external usage
7 External ON/OFF (release) active low
8 GND, electronic ground
9 Configurable digital input 1 active low
10 GND, electronic ground
11 Low water active low
X3/
12 GND, electronic ground
Low water
e.g. incoming pressure switch or water level switch required.
Configurable digital input 1
e.g. to enable 2nd required value
External ON/OFF (release)
GND, electronic ground
User SIO-Interface: SIO+
User SIO-Interface: SIO-
Sensor supply max. 100 mA
Actual-value input sensor 1 0-10V or 0-20mA / 4-20mA [Ri=50Ω]
Ground