7.18
SEL-751A Relay Instruction Manual Date Code 20100129
Communications
SEL ASCII Protocol and Commands
Because the password is not disabled, the relay prompts you for the Access
Level 1 password:
Password: ?
The relay is shipped with the default Access Level 1 password shown in
PASSWORD Command (Change Passwords) on page 7.33. At the prompt,
enter the default password and press the <Enter> key. The relay responds
with the following:
[RID Setting] Date: mm/dd/yyyy Time: hh:mm:ss
[TID Setting] Time Source: external
Level 1
=>
The => prompt indicates the relay is now in Access Level 1.
If the entered password is incorrect, the relay prompts you for the password
again (
Password: ?). The relay prompts for the password as many as three
times. If the requested password is incorrectly entered three times, the relay
pulses the SALARM Relay Word bit for one second and remains at Access
Level 0 (= prompt).
Access Level Attempt (Password Not Required). Assume the following
conditions:
➤ Access Level 1 password is disabled.
➤ Access Level is 0.
At the Access Level 0 prompt, enter the ACC command:
=ACC <Enter>
Because the password is disabled, the relay does not prompt you for a
password and goes directly to Access Level 1. The relay responds with the
following:
[RID Setting] Date: mm/dd/yyyy Time: hh:mm:ss.sss
[TID Setting] Time Source: external
Level 1
=>
The => prompt indicates the relay is now in Access Level 1.
The two previous examples demonstrate going from Access Level 0 to
Access Level 1. The procedure to go from Access Level 1 to Access Level 2
with the 2AC command entered at the access level screen prompt is similar.
The relay pulses the SALARM Relay Word bit for one second after a
successful Level 2 access, or if access is denied.
AFT Command (Arc-Flash Detection Channels Self-Test)
Use the AFT command (Access Level 2) to initiate a self-test of the arc-flash
detection channels 1 to 4. This test requires that the relay has the SELECT
3AVI/4AFDI card in the slot E and the external fiber-optic connections are
complete. The test checks the integrity of the arc-flash detection system.
Figure 7.16 shows an example of the AFT command response. Refer to
Section 10: Testing and Troubleshooting for details on the arc-flash self tests.
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