Installing A Communication Interface Module - Grundfos CRE Series Installation And Operating Instructions Manual

6.12.3 Connecting a 2-core bus cable
• Connect a screened 2-core bus cable as follows:
1
A
Y
2
B
6.12.4 Bus signal
The product enables serial communication via an
RS-485 input. The communication is carried out
according to the Grundfos GENIbus protocol and
enables connection to a building management system
or another external control system.
Via a bus signal, you can remote-set operating
parameters, such as setpoint and operating mode. At
the same time, the product can provide status
information about important parameters, such as the
actual value of the control parameter, input power and
fault indications, via the bus.
Contact Grundfos for further information.
If you use a bus signal, the local settings
made via Grundfos GO or the HMI 300 or
301 operating panel will be overruled. In
case the bus signal fails, the product will
run with the local settings made via
Grundfos GO or the HMI 300 or 301
operating panel.
6.13 Installing a communication interface
module
WARNING
Electric shock
Death or serious personal injury
‐
Switch off the power supply to the
product including the power supply for
the signal relays. Wait at least 5
minutes before you make any
connections in the terminal box. Make
sure that the power supply cannot be
switched on accidentally.
Use an antistatic service kit when handling
electronic components. This prevents
static electricity from damaging the
components.
28
1
A
Y
2
B
Model K
1. Loosen the four screws (A) and remove the
terminal box cover (B).
A
B
Model K