Installation, Operation and Maintenance Manual
MAN712 Rev. 9
June 2021
Working Principle and Detailed Description
Section 5: Working Principle and Detailed Description
35
The Integrity Check of the RL Electrical Circuit (NC contact) returns a “Bad” result
(“RL1 Status”, “RL2 Status”) when:
•
The power supply is not applied.
•
The protection fuse is “open”.
•
The Relay contact is stuck.
•
The Coil is a “Short Circuit”.
If the Integrity Check fails on every enabled SOV Control Output the SAEC Alarm becomes
active (see Section 6.4), the ELBS-20 goes to the SLOW Operating Mode, the Automatic
Integrity Check is no more performed and it is necessary to clear this alarm and to manually
set the desired Operating Mode.
See Section 6 for details about the Configuration Parameters.
5.2.9
MODBUS RTU
The ELBS-20 is provided with a MODBUS RTU bus interface.
This interface allows configuring the ELBS-20 parameters, to read the current pressure
and position (if position sensor is present) value and to download the EVENT data (curves).
The MODBUS RTU interface is available only when the External Power Supply is applied
(see Section 5.2.2.3 for details).
For additional details see Section 8.
