Date Code 20020129
Testing and Troubleshooting
10-5
SEL-387E Instruction Manual
Method: Refer to the information sticker on the rear panel of the relay. Figure 10.2
provides an example. Check the information on this sticker before
applying power to the relay or starting tests. Be sure your dc supply is
correctly adjusted for the control and logic input requirements.
PART NUMBER:
0387EXXXXXXXXX
S/N:
LOGIC INPUT:
POWER SUPPLY:
AMPS:
99334035
85–264Vac 50/60 Hz
85–350Vdc 15W Max
125Vdc
5
DWG: M387E017
V/
φ
:
0–300V
Figure 10.2: Relay Part Number and Hardware Identification Sticker
Power Supply
Step 1.
Purpose: Establish control power connections.
Method: Connect a frame ground to terminal marked GND on the rear panel and
connect rated control power to terminals and -. Relays supplied
with 125 or 250 V power supplies may be powered from a 115 Vac wall
receptacle for testing. Other power supplies require dc voltage and are
polarity sensitive.
Step 2.
Purpose: Verify that +5 Vdc is presented on Ports 2 and 3. This voltage is
sometimes required by external devices that include a dc powered
modem.
Method: 1. Execute
the
STATUS
command from the serial port or front panel,
and inspect the voltage readings for the power supply.
2. Verify that JMP1 is installed for Serial Port 3 and JMP2 is installed
for Serial Port 2. Refer to
Section 2: Installation
for further
information about the jumpers.
3. Use a voltmeter to read the +5 V output. Pin 1 of each port should
have +5 Vdc on it when the jumpers mentioned above are installed.
4. Compare the +5 V readings from the status report and voltmeter. The
voltage difference should be less than 50 mV (0.05 V), and both
readings should be within ±0.15 V of 5 V.
Serial Communications
Step 1.
Purpose: Verify the communications interface setup.
Method: Connect a computer terminal to Ports 2, 3, or 4 of the relay.
Communication Parameters: 2400 Baud, 8 Data Bits, 1 Stop Bit, N Parity
