2010 Siemens Protection Devices Limited Chapter; Password Feature - Siemens 7SR21 Manual

7SR21 & 7SR22 Argus Description of Operation
6.9

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. The relay is supplied with the passwords set to NONE, i.e. the password feature is
disabled. 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.
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.
©2010 Siemens Protection Devices Limited Chapter 1 Page 71 of 71