Grundfos CRE Series Installation And Operating Instruction page 16

• three analog inputs
• one analog output
• two dedicated digital inputs
• two configurable digital inputs or open-collector outputs
• Grundfos Digital Sensor input and output
• two Pt100/1000 inputs
• two LiqTec sensor inputs
• two signal relay outputs
• GENIbus/Modbus connection
• two Safe Torque Off (STO) inputs
• Ethernet connection
Connection terminals for inputs and outputs
WARNING
Electric shock
Death or serious personal injury
‐
Make sure that the wires to be connected to the connection groups below are separated from each other by reinforced insulation
in their entire lengths.
The inputs and outputs are internally separated from the power supply-conducting parts by reinforced insulation and galvanically separated
from other circuits. All control terminals are supplied with safety extra-low voltage (SELV), ensuring protection against electric shock.
Cables for the relays and the Ethernet cable must be rated at least 250V/2A.
The 250V contacts of the alarm relays of these devices must not be connected directly to the supply mains, but energized by an
isolated power supply or transformer with galvanic isolation.
NC C1 NO NC C2 NO
Terminal
NC
C1
NO
NC
16
RJ45
DI3 24V AI2 5V
OFF ON
5V A Y B AI1 DI1
Type
Normally closed contact
Common
Normally open contact
Normally closed contact
• Bluetooth (BLE) connection.
4) FM311 is without Bluetooth.
Signal relay 1
LIVE: You can connect supply voltages up to 250 VAC to the output.
SELV: The output is galvanically separated from other circuits.
Therefore, you can connect the supply voltage or safety extra-low
voltage to the output as desired.
Signal relay 2
SELV: The output is galvanically separated from other circuits.
Therefore, you can connect the supply voltage or safety extra-low
voltage to the output as desired.
S24
TX RX
DI4 PT2 PT1 LT1
24V AO1 AI3 DI2
Function
Signal relay 1: LIVE or SELV
Signal relay 2: SELV only
4)
ST1 ST2
LT2