Xylem TEKNOSPEED - Manual (Page 23)

6.2.7 Protection against dry running (float switch)
The TEKNOSPEED converter can be connected to an external device for protection against pump dry
running (see chapter 6.1). The most conventional method consists in the use of a float switch installed in
the suction tank.
To connect the cable of the external device you must remove the converter’s radiator using a no. 5 Allen
wrench (maximum torque 6 Nm). Turn the radiator upside down, paying attention to the connections with
the removable terminal board. The terminal board may have to be extracted. Replace an M 16 x 1.5 plug
with one of the cable glands supplied. Lay the float switch cable and connect it to the terminals corre-
sponding to LOW 1 and LOW 2 (suitable for 0.5÷1 mm2 conductors). Screw down the cable fastening
plate and tighten the cable gland to secure the cable. If you connect the suction side of the pump to the
municipal water system, you can use a pressure switch that opens its contact when the pressure drops
below the set point.
If you are not using any device, two terminals must be connected with a jumper.
Use the slotted blade screwdriver (2.5 mm) provided with the TKS system for the connections on
the converter’s terminal board.
For further information refer to chapter 12.
6.2.8 External Enable Device
You can connect a switch instead of the float switch (chapter 6.2.7). This external device can be used to
enable or disable the system. We recommend using a shielded cable. The stripping of the cable should
allow the shielding to be in contact with the cable fastening plate.
Use the slotted blade screwdriver (2.5 mm) provided with the TKS system for the connections on
the converter’s terminal board.
For further information refer to chapter 12.
6.2.9 Alarm Relay
The TEKNOSPEED converter has a contact that can be used to obtain an external shutdown or malfunc-
tion signal.
This contact is closed when
• the pump is not running due to one of the following causes : no voltage
motor overload (chapter 6.2.5)
motor overtermperature (chapter 6.2.6)
converter overtemperature (chapter 6.2.7)
Probe faulty or disconnected (chapter 6.2.11)
• lack of water on suction side (chapters 6.2.8 and 6.2.9)
To connect the cable you must first take the radiator off the converter using a no. 5 Allen wrench (maxi-
mum torque 6 Nm). Turn the radiator upside down, paying attention to the connections with the remova-
ble terminal board. The terminal board may have to be extracted. Replace an M 16 x 1.5 plug with one of
the cable glands supplied. Lay the cable and connect it to the terminals corresponding to COM and NC
(suitable for 0.5÷1 mm2 conductors). Screw down the cable fastening plate and tighten the cable gland
to secure the cable.
We recommend using a shielded cable. The stripping of the cable should allow the shielding to be in
contact with the cable fastening plate.
Use the slotted blade screwdriver (2.5 mm) provided with the TKS system for the connections on
the converter’s terminal board.
For further information refer to chapter 12.
6.2.10 Serial Interface
The TEKNOSPEED converter is equipped with a serial interface that can only be used on pumping sy-
stems with two pumps.
Do not connect any wires to the COM, TX, RX terminals of the serial interface.
For further information refer to chapter 12.
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