U.4.77
Date Code 20090715 User’s Guide SEL-421 Relay
Basic Relay Operations
Configuring High-Accuracy Timekeeping
This example assumes that you have successfully established communication
with the relay (see Making an EIA-232 Serial Port Connection on page U.4.5).
In addition, you must be familiar with relay access levels and passwords (see
Changing the Default Passwords: Terminal on page U.4.9 to change the
default access level passwords). Also, you should be familiar with
ACSELERATOR QuickSet (see Section 3: PC Software).
Step 1. Configure the communications port.
a. Start
ACSELERATOR QuickSet.
b. On the top toolbar, open the Communication menu,
and then click Port Parameters.
You will see the Port Parameters dialog box similar to
Figure 4.7.
c. Select the Data Speed, Data Bits, Stop Bits, Parity,
and RTS/CTS that match the relay settings.
The defaults are 9600, 8, 1, None, and Off,
respectively.
d. Click OK to update the
ACSELERATOR QuickSet
communications parameters.
e. Confirm that the Communications Status bar at the
bottom of the
ACSELERATOR QuickSet window says
Connected.
Step 2. Confirm the correct
ACSELERATOR QuickSet passwords.
a. Reopen the Communication menu and click Port
Parameters.
b. 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.
c. Click OK to accept changes and close the dialog box.
Step 3. Read the present configuration in the SEL-421. Click Settings
> Read.
The relay sends all configuration and settings data to
ACSELERATOR QuickSet.
Step 4. Access the protection free-form SEL
OGIC settings.
a. Click the + mark next to Group 1 in the Settings tree
view.
b. Click the Protection Logic 1 settings (see Figure 4.68).
Step 5. Enter the two lines of SEL
OGIC control equation programming
in the Protection Free-Form Logic Settings shown in
Figure 4.68.
Comments begin with the # character (see Fixed SEL
OGIC
Control Equations on page R.3.4).
Courtesy of NationalSwitchgear.com
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