Change Lock Function Chnglck; Identification; Functionality; Function Block - Hitachi Relion 650 Series Technical Manual

1MRK 511 557-UEN Rev. A
14.6

Change lock function CHNGLCK

14.6.1

Identification

Function description
Change lock function
14.6.2

Functionality

Change lock function CHNGLCK is used to block further changes to the IED configuration and
settings once the commissioning is complete. The purpose is to block inadvertent IED configuration
changes beyond a certain point in time.
The change lock function activation is normally connected to a binary input.
When CHNGLCK has a logical one on its input, then all attempts to modify the IED configuration and
setting will be denied and the message "Error: Changes blocked" will be displayed on the local HMI;
in PCM600 the message will be "Operation denied by active ChangeLock". The CHNGLCK function
should be configured so that it is controlled by a signal from a binary input card. This guarantees that
by setting that signal to a logical zero, CHNGLCK is deactivated. If any logic is included in the signal
path to the CHNGLCK input, that logic must be designed so that it cannot permanently issue a logical
one to the CHNGLCK input. If such a situation would occur in spite of these precautions, then please
contact the local Hitachi Energy representative for remedial action.
14.6.3

Function block

LOCK*
D0E13015T201305151403 V1 EN-US
Figure 173: CHNGLCK function block
14.6.4

Signals

Table 361: CHNGLCK Input signals
Name
LOCK
Table 362: CHNGLCK Output signals
Name
ACTIVE
OVERRIDE
14.6.5

Settings

The function does not have any parameters available in Local HMI or Protection and Control IED
Manager (PCM600)
Technical Manual
CHNGLCK
ACTIVE
OVERRIDE
IEC09000062-1-en.vsd
Type Default
BOOLEAN 0
Type
BOOLEAN
BOOLEAN
© 2021 Hitachi Energy. All rights reserved.
IEC 61850 IEC 60617
identification identification
CHNGLCK -
Description
Activate change lock
Description
Change lock active
Change lock override
Section 14
Basic IED functions
D0E6772T201305151403 v1
ANSI/IEEE C37.2
device number
-
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D0E6769T201305151403 v1
D0E7272T201305151403 v1
D0E7273T201305151403 v1
D0E6903T201305151403 v1
389