Signal Cables; Bus Connection Cable; New Installations; Replacing An Existing Pump - Grundfos TPE 2000-Serie Installationsanleitung

5.4 Signal cables

• Use screened cables with a cross-sectional area of min.
2 2
0.5 mm and max. 1.5 mm
input, setpoint and sensor signals.
• Connect the screens of the cables to frame at both ends with
good frame connection. The screens must be as close as
possible to the terminals, fig. 16.
Fig. 16 Stripped cable with screen and wire connection
• Always tighten screws for frame connections whether a cable
is fitted or not.
• Make the wires in the pump terminal box as short as possible.

5.5 Bus connection cable

5.5.1 New installations

For the bus connection, use a screened 3-core cable with a
cross-sectional area of min. 0.2 mm
• If the pump is connected to a unit with a cable clamp which is
identical to the one on the pump, connect the screen to this
cable clamp.
• If the unit has no cable clamp as shown in fig. 17, leave the
screen unconnected at this end.
A
1
2
Y
3
B
Fig. 17 Connection with screened 3-core cable

5.5.2 Replacing an existing pump

• If a screened 2-core cable is used in the existing installation,
connect it as shown in fig. 18.
A
1
Y
2
B
Fig. 18 Connection with screened 2-core cable
• If a screened 3-core cable is used in the existing installation,
follow the instructions in section 5.5.1 New installations.
for external on/off switch, digital
2 2
and max. 1.5 mm .
Pump
A
1
2
Y
3
B
Pump
A
1
Y
2
B

5.6 Communication cable for TPED pumps

The communication cable is connected between the two terminal
boxes. The screen of the cable is connected to the frame at both
ends with a good frame connection.
Fig. 19 Communication cable
The communication cable has a master end and a slave end as
shown in fig. 20.
Master end
White label
Fig. 20 Master end and slave end
On pumps with factory-fitted sensor, the master end and the
sensor are connected to the same terminal box.
When the electricity supply to the two pumps has been switched
off for 40 seconds and switched on again, the pump connected to
the master end will start up first.

5.6.1 Connection of two sensors

The sensor signal is copied to the other pump through the red
wire of the communication cable.
If, optionally, two sensors are connected (one sensor to each
terminal box), cut the red wire. See fig. 21.
Master end
White label
Fig. 21 Elimination of copied sensor signal
Slave end
Jumper
Slave end
Jumper
15