Schweitzer Engineering Laboratories SEL-351-5, Instruction Manual, Page: 79 / 706

2.39
Date Code 20070117
Instruction Manual SEL-351-5, -6, -7 Relay
Installation
Circuit Board Connections
Note that JMP6 in Figure 2.24 has multiple jumpers A through D. Jumpers A
and B are used (see Table 2.5 and Table 2.6 ). Since jumpers C and D are not
used, the positions (ON or OFF) of jumpers C and D are of no consequence.
EIA-232 Serial Port
Voltage Jumpers
The jumpers listed in Table 2.7 connect or disc5 Vdc to Pin 1 on the
corresponding EIA-232 serial ports. The +5 Vdc is rated at 0.5 A maximum
for each port. See
Table 10.2 for EIA-232 serial port pin functions.
In a standard relay shipment , the jumpers are “OFF” (removed/not in place)
so that the +5 Vdc is not connected to Pin 1 on the corresponding EIA-232
serial ports. Put the jumpers “ON” (in place) so that the +5 Vdc is connected
to Pin 1 on the corresponding EIA-232 serial ports.
Condition of Acceptability for North American Product Safety
Compliance
To meet product safety compliance for end-use applications in North
American, use an external fuse rated 3 A or less in-line with the +5 Vdc
source on Pin 1. SEL fiber-optic transceivers include a fuse that meets this
requirement.
Clock Battery
Refer to Figure 2.24 for clock battery location (front of main board). A
lithium battery powers the relay clock (date and time) if the external dc source
is lost or removed. The battery is a 3 V lithium coin cell. At room temperature
(25°C), the battery will nominally operate for 10 years at rated load.
If the dc source is lost or disconnected, the battery powers the clock. When the
relay is powered from an external source, the battery only experiences a low
self-discharge rate. Thus, battery life can extend well beyond the nominal
10 years because the battery rarely has to discharge after the relay is installed.
The battery cannot be recharged.
If the relay does not maintain the date and time after power loss, replace the
battery. Follow the instructions in
Accessing the Relay Circuit Boards on
page 2.33 to remove the relay main board.
Step 1. Remove the battery from beneath the clip and install a new one.
The positive side (+) of the battery faces up.
Step 2. Reassemble the relay as described in Accessing the Relay
Circuit Boards .
Step 3. Set the relay date and time via serial communications port or
front panel (see Section 10: Serial Port Communications and
Commands or Section 11: Front-Panel Interface , respectively).
c
The OPEN , CLOSE , and PULSE commands are used primarily to assert output contacts for circuit
breaker control or testing purposes (see Section 10: Serial Port Communications and
Commands ).
Table 2.7 EIA-232 Serial Port Voltage Jumper Positions for Standard Relay
Shipments
SEL-351 Model
Number
EIA-232
SERIAL PORT 2
(rear panel)
EIA-232
SERIAL PORT 3
(rear panel)
Reference Figures
0351 x 0,
0351 x 1,
and 0351 x Y
JMP2 = OFF JMP1 = OFF Figure 2.24
There is danger of explosion if the
battery is incorrectly replaced.
Replace only with Ray-O-Vac
®
no.
BR2335 or equivalent recommended
by manufacturer. Dispose of used
batteries according to the
manufacturer’s instructions.
!
CAUTION