7
en
Connect the
RCTT Remote control
(accessory) to the following terminals:
7
GND RCTT Remote control
8
Switching input RCTT Remote control
9
Signal LED output RCTT Remote control
Connect the
VBus
®
to the terminals marked
VBus
with either polarity:
13
VBus terminal
14
VBus terminal
The
mains connection
is at the following terminals:
25
Neutral conductor N
27
Conductor L
15
Protective conductor
⏚
The controller comes with the following
cable links
pre-connected:
24
Link from the neutral conductor to terminal 21
26
Link from the conductor L to terminal 23
2.3
Grundfos Direct Sensor
TM
The controller is equipped with 1 input for a digital VFD Grundfos Direct Sensor™
for measuring the flow rate and the temperature. Connection is made at the VFD
terminal (bottom left).
2.4
PWM interface
Speed control of a HE pump is possible via a PWM signal. The pump has to be
connected to the relay as well as to the PWM output of the controller. Power is
supplied to the HE pump by switching the corresponding relay on or off.
The terminal marked
PFB
is an interface for a bidirectional HE pump.
10
PWM output, control signal
11
PWM, GND
12
PWM input, feedback signal
2.5
Data communication / Bus
The controller is equipped with the VBus
®
for data transfer and energy supply to
external modules. The connection is to be carried out at the terminals marked
VBus
(any polarity). One or more VBus
®
modules can be connected via this data
bus, such as:
• SD3 Smart Display / GA3 Large Display
• DL2 / DL3 Datalogger
• KM1 Communication modules
Furthermore, the controller can be connected to a PC or integrated into a net-
work via the VBus
®
/USB or VBus
®
/LAN interface adapter (not included).
Note
More accessories on page 37.
