U.4.63
Date Code 20090715 User’s Guide SEL-421 Relay
Basic Relay Operations
Operating the Relay Inputs and Outputs
Close the circuit breakers using Relay Word bits BK1CLS and BK2CLS for
Circuit Breaker 1 and Circuit Breaker 2, respectively.
Assigning Control Outputs for Tripping and Closing
The procedure in the following steps shows a method for setting the relay to
operate the trip bus and the close bus at a typical substation. Relay factory
defaults assign control outputs OUT101 and OUT102 to the trip bus and
OUT103 to the close bus for a three-pole tripping circuit breaker. This
procedure assigns an additional close output at OUT106.
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). You should also 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, 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. Click Settings > Read.
The relay sends all configuration and settings data to
ACSELERATOR QuickSet.
Step 4. Access the Main Board output settings.
a. Expand the Outputs branch of the Settings tree view.
b. Click Main Board (see Figure 4.55).
Courtesy of NationalSwitchgear.com
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