Schweitzer Engineering SEL-351P - SEL-351 P Troubleshooting; Inspection Procedure; Troubleshooting Procedure; All Front-Panel Leds Dark

13-8 Testing and Troubleshooting Date Code 990215
SEL-351P Manual Técnico
Self-Test Condition Limits
Protection
Disabled
ALARM
Output Description
Battery
Current
Warning -5 A
185 mA
No Pulsed Measures battery
charge/discharge current
every 10 seconds.
SF6 Gas
Pressure
Warning Relay
Word bit
SF6LO
asserts
No Pulsed Indicates SF6 gas
pressure going below
setting level SF6PRS.
SEL-351P T ROUBLESHOOTING
Inspection Procedure
Complete the following procedure before disturbing the SEL-351P. After you finish the inspec-
tion, proceed to the Troubleshooting Procedure.
1. Measure and record the AC power supply voltage at the power input terminals’ positions 17
and 20 on the terminal block.
2. Record battery voltage of the two series-connected batteries at the battery terminals.
3. Measure and record the voltage at all SEL-351P inputs (if used).
4. Measure and record the state of all output contacts (if used).
Troubleshooting Procedure
All Front-Panel LEDs Dark
1. Input ac power not present and battery discharged.
2. Input ac power not present and battery disconnected or otherwise defective.
3. Self-test failure.
Cannot See Characters on LCD Screen
1. SEL-351P is deenergized. Check to see if the ALARM contact is closed.
2. LCD contrast is out of adjustment. Use the steps below to adjust the contrast.
a. Press and hold down the OTHER front-panel pushbutton.
b. Use the UP (↑) and DOWN (↓) arrow pushbuttons to adjust the contrast.
SEL-351P Does Not Respond to Commands From Device Connected to Serial Port
1. Communications device not connected to SEL-351P.
2. SEL-351P or communications device at incorrect baud rate or other communication
parameter incompatibility, including cabling error.
3. SEL-351P serial port has received an XOFF, halting communications. Type <CTRL>Q to
send control an XON and restart communications.