Siemens 7SR157 Argus, Manual

Page: 42 / 180

7SR157 Technical Manual
Chapter 1 - Page 38 of 38 © 2022 Siemens Protection Devices Limited
6.8 Password Feature
The relay incorporates two levels of password protection – one for settings, the other for control functions.
The programmable password feature enables the user to enter a 4 character alpha numeric code to secure
access to the relay functions. A Password of
NONE indicates that a Password has not been set and that the
Password feature is disabled. Where a Relay is delivered with the Password already set, this will be "AAAA".
The password must be entered twice as a security measure against accidental changes. Once a password has
been entered then it will be required thereafter to change settings or initiate control commands. Passwords can be
de-activated by using the password to gain access and by entering the password
NONE . Again this must be
entered twice to de-activate the security system.
As soon as the user attempts to change a setting or initiate control the password is requested before any changes
are allowed. Once the password has been validated, the user is ‘logged on’ and any further changes can be
made without re-entering the password. If no more changes are made within 1 hour then the user will
automatically be ‘logged off’, re-enabling the password feature.
The Settings Password prevents unauthorised changes to settings from the front fascia or over the data comms
channel(s). The Control Password prevents unauthorised operation of controls in the relay Control Menu from the
front fascia. 7SR157 does not provide a Control Menu and therefore this password is not used.
The password validation screen also displays a numerical code. If the password is lost or forgotten, this code
should be communicated to Siemens Protection Devices Ltd. and the password can be retrieved.