U.4.25
Date Code 20020501 User’s Guide SEL-421/SEL-421-1 Relay
Basic Relay Operations
Making Simple Settings Changes
Step 7. End the settings process. Type END<Enter>. The relay next
scrolls a readback of all the Front-Panel settings, eventually
displaying the “Save settings (Y,N) ?” prompt. (In Figure 4.15,
a vertical ellipsis represents this scrolling readback.) At the end
of the readback information, just before the “Save settings
(Y,N) ?” prompt, you can verify the new display point
information. Answer Y<Enter> to save your new settings.
Settings: the
ACSELERATOR
Software
You can use the ACSELERATOR software to develop settings for the SEL-421
Relay offline. The
ACSELERATOR software automatically checks interrelated
settings and alerts you to out-of-range settings. Upload the off-line
ACSELERATOR software settings to the relay via the communications ports.
See Checking Relay Status:
ACSELERATOR Software on page 4.12 for an
introductory tutorial on using the
ACSELERATOR software.
You can also use the
ACSELERATOR software as a terminal program to interact
in real time with the relay. For an introduction to the
ACSELERATOR software
and all of features of this software, see Section 3: PC Software in the User’s
Guide.
Making Initial Global Settings: ACSELERATOR Software
The ACSELERATOR software makes setting the relay an easy task. The
purpose of the procedure in the following steps is to familiarize you with
reading, modifying, and sending settings with the
ACSELERATOR software.
This example assumes that you have successfully established communication
with the relay; see Making an EIA-232 Serial Port Connection on page 4.6 for
a step-by-step procedure. In addition, you must be familiar with relay access
levels and passwords. See Changing the Default Passwords: Terminal on
page 4.10 to change the default access level passwords. You should also be
familiar with the
ACSELERATOR software; see Section 3: PC Software in the
User’s Guide, and Checking Relay Status:
ACSELERATOR Software on
page 4.12.
Step 1. Configure the communications port. Start the
ACSELERATOR
software. On the top toolbar, open the Communication menu,
and then click Communication Parameters. You will see the
Communication Parameters dialog box similar to Figure 4.8.
Select the Data Speed, Data Bits, Parity, and Stop Bits that
match the relay settings. Defaults are 9600, 8, N, 1,
respectively. Click OK to update the
ACSELERATOR software
communications parameters. Type <Ctrl+T> to open the
ACSELERATOR software terminal window. Type <Enter> to
see whether the communications link is active between the
ACSELERATOR software and the relay. You will see the = action
prompt in the terminal window. Exit the terminal window.
Step 2. Confirm the correct
ACSELERATOR software passwords.
Reopen the Communication menu and click Port Parameters.
Enter your Access Level 1 password in the Level One
Password text box, and your Access Level 2 password in the
Level Two Password text box. Click the OK button to accept
changes and close the dialog box.
Step 3. Read the present configuration in the SEL-421 Relay. On the
Settings menu, click Read. The relay sends all configuration
and settings data to the
ACSELERATOR software.
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