19 / 76
5.4.1 Electrical connections
Fig. 6:
Terminal strip, mainboard
Table 9:
Mainboard connections
Code
Designation
Description
A1
PE
Potential equalisation
A2
~
24 V AC power supply
A3
~
B1
B
RS485_1 communication cable. A terminating resistor located next to this connection has to be
set to ON if it is the end of the communication cable.
B2
A
B3
GND
C1
R1_NO
Switching relay Alert.
Normally open when one or several alert messages are present or when the control unit is off.
C2
R1_C
C3
R1_NC
C4
R2_NO
Switching relay Warning.
Normally open when one or several warning messages are present or when the control unit is
off.
C5
R2_C
C6
R2_NC
D1
DO1_C
Digital outputs 1 to 4. Pre-configured for starting up pumps 1 to 4.