6
2.2
Electrical connection
WARNING!
ESD damage!
electrostatic discharge can lead to
damage to electronic components!
Î
Take care to discharge
properly before touching the
inside of the device! To do
so, touch a grounded surface
such as a radiator or tap!
Note:
the pump speed must be set to 100 %
when auxiliary relays or valves are connec-
ted.
input for analog
Grundfos Direct
sensors™
input for digital
Grundfos Direct sensors™
potential-free
changeover relay
sensor
ground common terminal block
sensor terminals
protective earth
conductor common
terminal block (pe)
neutral conductor
common terminal
block
Note
For more details about the initial commissi-
oning procedure, see page 12.
Note
Connecting the device to the power supply
must always be the last step of the instal-
lation!
the controller is equipped with 14
relays
in total to
which loads such as pumps, valves, etc. can be con-
nected:
relays 1 ... 13 are semiconductor relays, designed for
pump speed control:
Conductor r1 ... r13
neutral conductor n (common terminal block)
protective earth conductor (common terminal
block)
relay 14 is a potential-free changeover relay:
r14-a = normally open contact
r14-m = centre contact
r14-r = normally closed contact
WARNING!
Electric shock!
upon opening the housing, live
parts are exposed.
Î
Always disconnect the
controller from power supply
before opening the housing!
Depending on the product version, mains cables
and sensor cables are already connected to the de-
vice. If that is not the case, please proceed as follows:
Temperature sensors
have to be connected to the
terminals s1 ... s12 and GnD (either polarity).
pWm (0-10 V)
terminals
VBus
®
295931-36390-8667 SOM 8 plus_en.indb 6
20.10.2011 13:14:20