Other Connections - Single-Phase Pumps; Other Connections - Single-Phase Tped Pumps - Grundfos LME Series Installation And Operating Instructions Manual

2.3 Other connections – single-phase pumps
Note: For single-phase TPED pumps, see section 2.4 Other con-
nections – single-phase TPED pumps.
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. 8.
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 1-9, and bus connection, B, Y, A).
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, C, NO).
The output (group 2) is galvanically separated from other cir-
cuits. Therefore, the supply voltage or protective extra-low
voltage can be connected to the output as desired.
3. Supply voltage (terminals N, PE, L).
A galvanically safe separation must fulfil the requirements for re-
inforced insulation including creepage distances and clearances
specified in EN 50 178.
Fig. 8
MGE 71 and MGE 80
NC C NO N PE L
0-10 V
0/4-20 mA
4-20 mA
0/1
1 9 8 7
STOP
RUN
0/4-20 mA 0-10 V
10K
6 5 4 3 2
1: Digital input
9: GND (frame)
8: +24 V
7: Sensor input
B: RS-485B
Y: Screen
B Y A
A: RS-485A
6: GND (frame)
5: +10 V
4: Setpoint input
3: GND (frame)
2: Start/stop
2.4 Other connections – single-phase TPED pumps
The connection terminals of external potential-free contacts for
start/stop and digital function, external setpoint signal, sensor sig-
nal, GENIbus, relay signal and communication cable are shown in
fig. 9.
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 1-9, and bus connection, B, Y, A).
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, C, NO).
The output (group 2) is galvanically separated from other cir-
cuits. Therefore, the supply voltage or protective extra-low
voltage can be connected to the output as desired.
3. Supply voltage (terminals N, PE, L).
4. Communication cable (8-pin male socket).
The communication cable is connected to the socket in group
4. The cable ensures communication between the two pumps,
whether one or two pressure sensors are connected, see sec-
tion 2.6 Signal cables.
The selector switch in group 4 enables changeover between
the operating modes "alternating operation" and "standby op-
eration". See description in section 3.2.1 Additional operating
modes – single-phase TPED pumps.
A galvanically safe separation must fulfil the requirements for re-
inforced insulation including creepage distances and clearances
specified in EN 50 178.
Fig. 9
MGE 71 and MGE 80
NC C NO
0-10 V
0/4-20 mA 4-20 mA
0/1
B Y A 1 9 8 7
STOP
RUN
0/4-20 mA 0-10 V
10K
6 5 4 3 2
N PE L
1: Digital input
9: GND (frame)
8: +24 V
7: Sensor input
B: RS-485B
Y: Screen
A: RS-485A
6: GND (frame)
5: +10 V
4: Setpoint input
3: GND (frame)
2: Start/stop
7