Date Code 20000525
SEL-2600 RTD Module
SEL-701 Motor Relay Application
5
Step 1.
Connect the SEL-2600 to the SEL-701 Motor Relay using fiber-
optic cable C801FD. Connect the cable between the SEL-2600
Fiber-Optic TX output and the SEL-701 Motor Relay Fiber-Optic
RX input.
Step 2.
Set the SEL-701 Motor Relay to accept the RTD temperature data
packets (see Data Packet Definition on page 11) sent by the
SEL-2600. You can use any of the following three methods to
enter the settings.
➢
Relay front-panel menus: Set Relay\Relay Elements\RTD
CONFIGURATION.
➢
Personal computer connected to the relay serial port, running
SEL-701PC software.
➢
Personal computer connected to the relay serial port, using a
terminal emulation software package.
In the SEL-701 Relay, set the RTD Input Option setting
(RTDOPT) equal to EXT. This enables use of the external module
data. Set the RTD Location and RTD Type settings based on the
information you recorded in Table 1 on page 4. Finally, set the
RTD Alarm and Trip Temperature settings as required for your
application.
Refer to the SEL-701 Motor Relay Instruction Manual for more
details regarding calculation and entry of these settings.
Step 3.
After accepting the relay settings, verify correct RTD temperature
measurement using one of these methods.
➢
Relay front-panel menus: Meter Values\Thermal & RTD
Data.
➢
Personal computer connected to the relay serial port, running
SEL-701PC software.
➢
Personal computer connected to the relay serial port, using a
terminal emulation software package and the METER T
command.
The relay will indicate the temperatures of each connected,
healthy RTD. If the relay reports that an RTD is open or shorted,
or if the temperature reading is wrong, verify the wiring at the
SEL-2600. Also verify the RTD type connected to that input
matches the RTD type setting.