September 2019
Installation, Operation and Maintenance Manual
MAN720_IMVS2000v2_IOM Rev. 6
MAN720_IMVS2000v2_IOM Rev. 6
Section 5: Working Principle
Working Principle
The SOLENOID A CONTROL and the SOLENOID B CONTROL are used for managing the external Solenoid
Valves and their status determines the Position Request (see Sections 5.2.2.1 and 5.2.2.2 for details).
The SOLENOID A CONTROL and SOLENOID B CONTROL can also be used for the SOVs TEST
(see Section 5.2.2.1 for details).
The PST CONTROL allows launching a Manual PST or a “SOV A TEST” or a “SOV A – SOV B TEST”
(see Section 5.2.2.1 for details).
5.2.2.1 Digital Inputs Table
The table below explains the working mode of the Digital Inputs. See 6 for details about the
configuration parameters.
Table 2.
Name Terminals # Type Description
Type of
Command
SOLENOID A CONTROL
(SOV A CTRL)
(*) (**)
19-20
Digital
Input
It is used for controlling the RELAY A contact that is used for
managing the SOV A connected to the terminals 11-10-9
(COMMON-NO-NC).
If SOV A CTRL = active and “Act. Mode” = “Double” or
SOV A CTRL = not active and “Act. Mode” ≠ “Double” =>
Terminals 11-10: power supply applied on terminals 6-5
Terminals 11- 9: 0 Volts
If SOV A CTRL = not active and “Act. Mode” = “Double” or
SOV A CTRL = active and “Act. Mode” ≠ “Double” =>
Terminals11-10: 0 Volts
Terminals 11-9: power supply applied on terminals 6-5
This DI is used to dene the “Position Request” (see the “Posi-
tion Request Table”).
The command, associated to this DI, is considered active when
a correct voltage is applied on its terminals.
Push to run
SOLENOID B CONTROL
(SOV B CTRL)
(*) (**)
21-22
Digital
Input
It is used for controlling the RELAY B contact that is used for
managing the SOV B connected to the terminals 18-17-16
(COMMON-NO-NC) or for performing the SOV TEST on the SOV
B.
If “Act. Mode” ” ≠ “Double” and “SOV Qty” = “Simplex” and
“PST Ser. SOVs” = “One”, this input is not read and it does not
affect the control of the RELAY B.
If “Act. Mode” ” ≠ “Double” and “SOV Qty” = “Simplex” and
“PST Ser. SOVs” = “Both”, this input is used for launching the SOV
TEST of the SOV B.
The change from not active to active start the SOV Test.
Otherwise the DI is used to control RL B to dene the Position
Request see the “Position Request Table” for details).
If SOV B CTRL = active and “Act. Mode” = “Double” or
SOV B CTRL = not active and “Act. Mode” ≠ “Double” =>
Terminals 18-17: power supply applied on terminals 13-12
Terminals 18- 16: 0 Volts
If SOV B CTRL = not active and “Act. Mode” = “Double” or
SOV B CTRL = active and “Act. Mode” ≠ “Double” =>
Terminals18-17: 0 Volts
Terminals 18-16: power supply applied on terminals 13-12
The command, associated to this DI, is considered active when a
correct voltage is applied on its terminals.
Push to run
/
Change of
status
(****)
32
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