Sel SEL-DTA2, Инструкция по эксплуатации

Страница: 41 / 44

5.5
Date Code 20020329
SEL-DTA2 Instruction Manual
Maintenance and Testing
Introduction
Step 16. Change the relay and SEL-DTA2 passwords to strong private
passwords. Cycle power on the relay and SEL-DTA2 to re-
establish communication.
This checkout procedure demonstrates only a few of the
SEL-DTA2 features. Study
Section 3: Communications for a
complete understanding of this instrument's capabilities.
Removing Cover
Step 1. Remove power source by disconnecting SEL-DTA2.
Step 2. Remove seven screws from top of cabinet.
Step 3. Remove two screws from rear panel.
Step 4. Remove cover by sliding to the rear.
Calibration
The SEL-DTA2 is factory calibrated to a very high degree of accuracy. If you
suspect that the unit is out of calibration, please contact the factory. We can
provide instructions for returning the unit for factory recalibration.
Troubleshooting
Inspection Procedure
Complete the following inspection procedure before disturbing the system.
After you finish the inspection, proceed to the Troubleshooting Table.
Step 1. Check to see that power to the SEL-DTA2 and target relay is
on.
Step 2. Inspect the cabling to the SEL-DTA2 serial communications
ports. Be sure the relay is connected to Port 2 and a
communications device is connected to Port 1.
Troubleshooting Table
Garbled or Nonexistent Display Data
Step 1. Power is off.
Blown fuse in SEL-DTA2
SEL-DTA2 input power is not present
Step 2. Loose or disconnected internal ribbon cable to display module.
Step 3. Display contrast incorrectly adjusted.
Step 4. SEL-DTA2 display module or main board failure.
System Does Not Respond to Commands
Step 1. Communications device not connected to system.
Step 2. SEL-DTA2 or communications device at incorrect baud rate or
other communication parameter incompatibility (parity, word
length, cabling error, etc.).
Step 3. System is attempting to transmit information, but cannot due to
handshake conflict. Check communications cabling.
Step 4. System is in the XOFF state, halting communications. Type
<CTRL>Q to put system in XON state.