10.19
Date Code 20020903
SEL-587Z Instruction Manual
Testing and Troubleshooting
Relay Troubleshooting
Relay Troubleshooting
Inspection
Procedure
Complete the following procedure before disturbing the relay. After you finish
the inspection, proceed to
.
Step 1. Measure and record the power supply voltage at the power
input terminals.
Step 2. Check to see that the power is on. Do not turn the relay off.
Step 3. Measure and record the voltage at all control inputs.
Step 4. Measure and record the state of all output relays.
Troubleshooting
Procedure
All Front-Panel LEDs Dark
Step 1. Input power not present or fuse is blown.
Step 2. Self-test failure.
Cannot See Characters on Relay LCD Screen
Step 1. Relay is de-energized. Check to see if the ALARM contact is
closed.
Step 2. LCD contrast is out of adjustment. Use the steps below to
adjust the contrast.
a. Remove the relay front panel by removing the six front-
panel screws.
b. Press any front-panel pushbutton. The relay should turn
on the LCD back lighting.
c. Locate the contrast adjust potentiometer directly
adjacent to the EN LED.
d. Use a small screwdriver to adjust the potentiometer.
e. Replace the relay front panel.
Relay Does Not Respond to Commands
From Device Connected to Serial Port
Step 1. Communications device not connected to relay.
Step 2. Relay or communications device at incorrect baud rate or other
communication parameter incompatibility, including cabling
error.
Step 3. Relay serial port has received an XOFF, halting
communications. Type
<Ctrl>Q
to send relay an XON and
restart communications.
Содержание SEL-587Z
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