2.22
SEL-700G Relay Instruction Manual Date Code 20170814
Installation
Rear-Panel Connections
Figure 2.12 Control I/O Connections—Internal RTD Option
Table 2.19 shows the maximum cable lengths for the RTD connections.
Analog Output Wiring
Connect the two terminals of the analog output as shown in Figure 2.13. Also
connect the analog output cable shield to ground at the relay chassis ground,
programmable logic controller (PLC), or meter location. Do not connect the
shield to ground at both locations.
+IRIG-B
–IRIG-B
IRIG-B
PS
A01
A02
–/N
+/H
External
Contacts
SEL-700G Relay
B01 B02
IN101
IN102
A10
A11
A12 A07
A08
OUT103
A03
A04
OUT101
A05
A06
OUT102
A09
As Many as Ten RTD Inputs
D03
COMP/
SHLD
D02
—
D01
+
RTD01
D30
COMP/
SHLD
D29
—
D28
+
RTD10
NOTE: All RTD Comp/
Shield terminals are
connected internally to
the relay chassis.
Notes:
➤ The chassis ground connector located on the
rear-panel card Slot A must always be
connected to the local ground mat.
➤ Power supply rating (125–250 Vac/dc or
24–48 Vdc) depends on the relay part number.
➤ Optoisolated inputs IN101 and IN102 are
standard and are located on the card in Slot A.
➤ All optoisolated inputs are single-rated: 24, 48,
110, 125, 220, or 250 Vac/Vdc. Standard inputs
IN101/102 can have a different rating than the
optional IN401/402/403/404 (not shown).
➤ Output contacts OUT101, OUT102, and
OUT103 are standard and are located on
the card in Slot A.
➤ The analog (transducer) outputs shown
are located on the optional I/O
expansion card in Slot D.
➤ The fiber-optic serial port is located on
the card in Slot B. A Simplex 62.5/125
µm fiber-optic cable is necessary to
connect the SEL
OGIC with an SEL-2600
series RTD Module. This fiber-optic
cable should be 1000 meters or shorter.
Table 2.19 Typical Maximum RTD Lead Length
RTD Lead AWG Maximum Length (meters)
28 116 m
26 184 m
24 290 m
22 455 m
20 730 m
18 1155 m
NOTE: RTD inputs are not internally
protected for electrical surges
(IEC 60255-22-1 and IEC 60255-22-5).
External protection is recommended
if surge protection is necessary.
NOTE: Connection of dc voltage to
the analog output terminals could
result in damage to the relay.
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