8
2.4 Other connections
The connection terminals of external potential-free contacts for
start/stop and digital function, external setpoint signal, sensor sig-
nal, GENIbus and relay signal are shown in fig. 4.
Note:
If no external on/off switch is connected, short-circuit termi-
nals 2 and 3 using a short wire.
Note:
As a precaution, the wires to be connected to the following
connection groups must be separated from each other by rein-
forced insulation in their entire lengths:
1.
Inputs
(external start/stop, digital function, setpoint and sen-
sor signals, terminals 1-8, and bus connection, terminals
A, Y, B).
All inputs (group 1) are internally separated from the mains-
conducting parts by reinforced insulation and galvanically
separated from other circuits.
All control terminals are supplied by protective extra-low volt-
age (PELV), thus ensuring protection against electric shock.
2.
Output
(relay signal, terminals NC, NO, C).
The output (group 2) is galvanically separated from other cir-
cuits. A maximum supply voltage of 250 V or protective extra-
low voltage can be connected to the output as desired.
A galvanically safe separation must fulfil the requirements for re-
inforced insulation including creepage distances and clearances
specified in EN 60 335.
Fig. 4
Connection terminals
2.5 Signal cables
•
Use screened cables having a cross-sectional area of min.
0.5 mm² and max. 1.5 mm² for external on/off switch, digital in-
put, setpoint and sensor signals.
•
The screens of the cables must be connected to frame at both
ends with good frame connection. They must be as close as
possible to the terminals, fig. 5.
Fig. 5
Stripped cable with screen and wire connection
•
Screws for frame connections must always be tightened
whether a cable is fitted or not.
•
The wires in the pump terminal box must be as short as possi-
ble.
2.6 Bus connection cable
2.6.1 New installations
For the bus connection a screened 3-core cable having a cross-
sectional area of min. 0.5 mm² and max. 1.5 mm² must be used.
•
If the pump is connected to a unit with a cable clamp which is
identical to the one on the pump, the screen must be con-
nected to this cable clamp.
•
If the unit has no cable clamp as shown in fig. 6, the screen is
left unconnected at this end.
Fig. 6
Connection with screened 3-core cable
2.6.2 Replacing an existing pump
•
If a screened 2-core cable is used in the existing installation, it
must be connected as shown in fig. 7.
Fig. 7
Connection with screened 2-core cable
•
If a screened 3-core cable is used in the existing installation,
follow the instructions in section
TM
02 19
52 260
1
Gro
up 2
G
rou
p 1
8: +24 V
7: Sensor input
6: GND (frame)
5: +5 V
4: Setpoint input
3: GND (frame)
2: Start/stop
1: Digital input
A: RS-485A
Y: Screen
B: RS-485B
Signal relay
NC
NO
C
TM
02
13
25
09
01
T
M
02
88
41
09
0
4
TM
02
88
42
09
04
A
Y
B
A
Y
B
1
2
3
1
2
3
Pump
A
Y
B
A
Y
B
1
2
1
2
Pump
