Grundfos CRE Series Installation And Operating Instructions Manual page 9

7.4.2 Connection terminals, CME pumps
The CME pump has these connections:
• two analog inputs
• two digital inputs or one digital input and one open-collector
output
• Grundfos Digital Sensor input and output
• two signal relay outputs
• GENIbus connection.
See fig. 9.
Digital input 1 is factory-set to be start/stop input
where open circuit will result in stop. A jumper
has been factory-fitted between terminals 2 and
Note
Note
6. Remove the jumper if digital input 1 is to be
used as external start/stop or any other external
function.
As a precaution, the wires to be connected to the
connection groups below must be separated
Note
Note
from each other by reinforced insulation in their
entire lengths.
•
Inputs and outputs
All inputs and outputs are internally separated from the power
conducting parts by reinforced insulation and galvanically
separated from other circuits.
All control terminals are supplied by safety extra-low voltage
(SELV), thus ensuring protection against electric shock.
• Start/stop: (Digital input 1) Terminals 2 and 6
• Pressure sensor: (Analog input 1) Terminals 4 and 8
• Pressure switch: (Digital input 3) Terminals 10 and 6
• External analog signal input: (Analog input 2) Terminals 7 and
23
• GENIbus Terminals A, Y and B
•
Signal relay outputs
– Signal relay 1:
LIVE:
Power supply voltages up to 250 VAC can be connected to
this output.
SELV:
The output is galvanically separated from other circuits.
Therefore, the supply voltage or safety extra-low voltage
can be connected to the output as desired.
– Signal relay 2:
SELV:
The output is galvanically separated from other circuits.
Therefore, the supply voltage or safety extra-low voltage
can be connected to the output as desired.
• Power supply (terminals N, PE, L or L1, L2, L3, PE)
A galvanically safe separation must fulfill the requirements for
reinforced insulation including creepage distances and
clearances specified in EN 61800-5-1.
9