Xylem HYDROVAR (HV2.1 - 3.45) - Manual (Page 29)

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6.3.3 Control Terminals
All control cables which are connected to the control- or RS485-terminal have to be screened.
If unscreened control cables are used, signal interference may occur and could interfere
to the function and signals of the HYDROVAR.
Don’t connect the ground of the control card to different voltage potentials.
All electronic ground terminals and GND of the RS 485-interface are connected internally.
1 GND, electronic ground
2 Actual value input 4-20mA, [Ri= 50 Ohm]
3 Power supply for external sensor [15VDC, max. 100mA]
4 GND, electronic ground
5 External on/off (release) [5VDC, Ri=10kOhm]
contacts suitable for switching <10VDC are necessary
6 GND, electronic ground
7 Low water [5VDC, Ri=10kOhm]
(e.g. incoming pressure switch or water level switch)
8 Thermal switch or PTC
(mounted in the motor terminal box) [5VDC, Ri=10kOhm]
9 Thermal switch or PTC
10 GND, electronic ground
11 Analogue output 0-10 VDC, [max. 2mA]
to show actual value or actual frequency
12 Current signal input 4-20mA
to determine the required value or the offset
13 Voltage signal input 0-10VDC or 2-10VDC
to determine the required value or the offset
Terminals:
X1/
14 Digital input for 2 nd Required value
1 NC
2 CC
3
Fault signal relay
NO
4 NC
5 CC
Terminal:
(dry contacts) X2/
6
Pump running relay
NO
[Max. 250VAC]
[Max. 220VDC]
[Max. 30VDC] [0,3A resistive load]
[0,3A resistive load]
[2A resistive load]
NOTICE! In case of no error, the fault relay (X2/2 - X2/3) is closed!
Terminal: X5 and X6/ 1 RS 485 SIO - LOW
2 RS 485 SIO + HIGH
3 RS 485 GND
4 RS 485 + 5 VDC [max. 20mA]
supply of external interface converter