Schweitzer Engineering Laboratories SEL-701, Instruction Manual

Page: 54 / 468

701 Motor Protection Relay
Date Code 20010719
Installation
Relay Connections
2.18
select the analog output range (0 –1 mA, 0 –20 mA, or 4 –20 mA). Connect the relay
output to the input of your PLC or panel meter.
The maximum load for the analog output depends on the selected output range.
When you select 0–20 mA or 4–20 mA, the maximum load is 400 ohms. When you
select 0–1 mA, the maximum load is 8000 ohms.
Connect the analog output cable shield to ground at terminal B03 (SHLD), or at
the PLC or meter location. Do not connect the shield to ground at both locations.
Figure 2.15 Analog Output Wiring.
Internal RTD Connections (Relay Models 0701010X & 0701011X)
The SEL-701 Relay is available with 11 optional internal RTD inputs.
When the relay is equipped with internal RTD inputs, you can enter relay settings
that define the type, location, trip, and alarm temperatures for each input individually.
RTDs can measure the temperature of the motor stator windings, motor or load
bearings, ambient temperature, or other temperatures. The relay can accurately
measure temperature represented by 100-ohm platinum, 100-ohm nickel, 120-ohm
nickel, or 10-ohm copper RTDs, but does not support temperature measurement using
thermistors or thermocouples.
The relay supports three-lead RTDs, providing terminals for +, –, and common
leads. For best lead-resistance compensation, all three leads should be the same length
and wire gauge. Maximum lead resistance is 25 ohms for platinum and nickel RTDs
and 3 ohms for copper RTDs.
Analog Output
B01
B02
B03
+
–
Shield
Meter
or
PLC