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3.4
CONNECTIONS BOARD FOR A SINGLE PUMP - CONTROL BOARD
x RS-485 Æ Communication port
x INI
Æ INIBIT input: NC external contact or NO for
START/STOP command
x S.P.
Æ External Set Point (EST) command: NA contact
x NTC
Æ NTC sensor input to control temperature or
potentiometer (see diagram)
x TRASD. Æ Input 0÷5 Volts for pressure transducer
x
+ Æ
x
-
Æ
x
D Æ
3.5
CONNECTIONS BOARD FOR TWIN PUMP - CONTROL BOARD
x RS-485 Æ Communication port
x INI
Æ INIBIT input: NC external contact or NO
for the START/STOP command
x S.P.
Æ External Set Point (EST) command: NA
contact
x NTC
Æ NTC sensor input to control temperature or
potentiometer (see diagram)
x TRASD. Æ Input 0÷5 Volts for pressure transducer
x
+ Æ
x
-
Æ
x D
If external INI and SP inlets are present, connect to the
master (PRI) only. They act as controls for the slave
(SEC).
x
Positive
Negative
Signal
Positive
Negative
Æ
Signal
To ensure a redundancy of system functions (in case of a twin system) or in case
of a fault to the control system or a motor, the INIBIT command, the second set
point, the sensor and the temperature probe must all be connected in a parallel
manner both to their respective master (PRI) and secondary (SEC) contacts.
Page 7 of 8
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