Schweitzer Engineering Laboratories SEL-701 - Analog Output Test; Table 7.7

Date Code 20010719 701 Motor Protection Relay
Commissioning
Selected Functional Tests
7.15
Analog Output Accuracy
Step 1. Connect a dc milliammeter in series with the analog output terminals
(B01, B02). Connect a PC to the relay front-panel serial port using an
appropriate serial cable. Using the SEL-701PC software terminal
function or other terminal emulation software, establish
communications with the relay at Access Level 2 (see Section 6:
ASCII Serial Port Operation for more details).
Step 2. Use the Access Level 2 ANALOG command to temporarily control
the analog output. Refer to Ta ble 7.7. Using the milliammeter
reading, verify that the analog output is correct for each level.
Table 7.7 Ana lo g Output Test
RTD Input Measuring Accuracy
Step 1. Use the front-panel Set Relay\Relay Elements\RTD Configuration
function or serial port SHOW command to view the input RTD Type
setting for each RTD input. Connect a variable resistance to each
RTD input in turn. The temperatures given in Ta ble 7. 8 through
Table 7.15 are based on the RTD type and the value of the resistance.
Referring to these tables, change the resistance applied to each input
until the appropriate temperature is displayed.
Step 2. Use the front-panel Meter Values\Thermal & RTD Data function or
serial port METER T command to view the present temperature
measured by the relay RTD input. The temperature displayed should
be ±2°C or ±4°F from the temperature represented by the variable
resistance.
Table 7.7 Analog Output Test
Desired
% Output
ANALOG
Command
Expected
Meter
Reading
(0–1 mA
Range)
Expected
Meter
Reading
(0–20 mA
Range)
Expected
Meter
Reading
(4–20 mA
Range)
Actual
Meter
Reading
0% ANA 0 1 0.0 mA 0.0 mA 4.0 mA
25% ANA 25 1 0.25 mA 5.0 mA 8.0 mA
50% ANA 50 1 0.5 mA 10.0 mA 12.0 mA
75% ANA 75 1 0.75 mA 15.0 mA 16.0 mA
100% ANA 100 1 1.0 mA 20.0 mA 20.0 mA