Section 4 1MRK 500 124-UEN
Local HMI
72 Operation Manual
Distributed busbar protection REB500
Section 4 Local HMI
4.1 Introduction
REB500 includes continuous comprehensive self-supervision and diagnosis of the
software and hardware components. By setting up a proper signaling scheme while
commissioning the system, most failures are signaled externally (see Section 3.6.3
“Binary input/output signals”). They can include internal REB500 as well as
external failures in primary and secondary systems that influence the response of
the protection. Other failures that are not detected (e.g. interrupted tripping circuit)
are located and cleared while carrying out periodic inspection and maintenance
(see “Commissioning manual”. Checks and measurements while the system is in
normal operation (no active alarms) are therefore unnecessary.
Normal operation without any faults is also indicated by the fact
that only the green protection LED is lit and the alarm page LED is
not lit on the local HMI.
An alarm (external or on the local HMI) can concern a failure in the REB500
system (e.g. hardware failure) or in the associated primary plant (e.g. incorrect
isolator status signal).
Should the system generate an alarm, inform the trained
maintenance personnel responsible.
4.2 Safety instructions
Checks and maintenance on the REB500 system may only be
carried out by properly trained personnel.
Only properly trained and authorized personnel should be in
possession of the HMI500 password.
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