Xylem IM131R01 AQUAVAR AV II - Manual (Page 28)

6. For multi-pump systems: Use a three core shielded cable to connect terminals 1, 2, and 3
on X5 between the AQUAVAR controller units. These are the RS-485 interface connections.
(See Diagram 11 and 13). Note: either RS485 port can be used.
• Connect pump one to pump two, two to three, and three to four (maximum is 4 pumps).
7. External pressure switch or float switch- (if used) to check incoming pressure and low/no
suction. Connect to terminal block X1 at the 6 and 7 location. Refer to Diagram 11.
When using a suction pressure switch, set the cut off at the maximum NPSH required by the pump.
8. External on/off
If used to turn the AQUAVAR controller on or off from an external panel or controller, connect to
terminal block X1 at the 4 and 5 location (refer to Diagram 7, page 24).
9. Analog output of pressure
A meter can be connected to X9 pins 2 and 1 for remote display of actual system pressure.
The meter must be 0-10 VDC volt with no more than 2 mA.
10. Second Sensor Input
The ground pin (X1-10) used for analog output can also be used to bridge a connection for
a second sensor. This can be digital (on/off) such as a switch which would be connected
between X
1
-10 and X
1
-14. Another choice is a sensor with a voltage signal of 0-10V or 2-10V
which would be connected to X
1
-10 and X
1
-13. A final choice is a 4-20 mA current sensor
which would be connected to pins X
1
-10 and X
1
-12.
27
Installation Procedures
Power supplies using G.F.I. breakers will cause nuisance tripping which will result in the
AQUAVAR controller displaying an “undervoltage” fault.
Note
If an external switch is NOT used, install a jumper wire between X1 Locations 4 and 5.
Note
X2
6
5
4
3
2
1
12
11
10
9
8
7
6
5
4
3
2
1
X1
13
14
X5
4
3
2
1
X2
6
5
4
3
2
1
12
11
10
9
8
7
6
5
4
3
2
1
X1
13
14
X5
4
3
2
1
X2
6
5
4
3
2
1
12
11
10
9
8
7
6
5
4
3
2
1
X1
13
14
X5
4
3
2
1
Diagram 9