BECKWITH ELECTRIC M-0420, Instruction Book

Page: 103 / 174

Test Procedures – 7
7–1
7
Test Procedures
7.1 Introduction ................................................................................. 7–1
7.2 Unit Setup ................................................................................... 7–1
7.3 Equipment Required ................................................................... 7–2
7.4 Test and Equipment Setup ........................................................ 7–2
7.5 Diagnostic Test Procedures ...................................................... 7–5
7.6 Self-Calibration Procedure ....................................................... 7–43
7.1 Introduction
This chapter presents step-by-step test procedures
for each relay function as well as the diagnostic
mode procedures and the self-calibration procedure.
(The diagnostic mode procedures provide a means
to check the basic functionality of the relay,
including inputs, outputs, the alphanumeric display,
LEDs, buttons, and the COM ports.) Refer to
Figure 6-5 for the external connections diagram.
These tests are based on the three-phase
line-to-neutral configuration, with DIP switches 4
and 5 OFF (up).
7.2 Unit Setup
No calibration is needed since the unit is cali-
brated and fully tested at the factory. If calibra-
tion is necessary because of a component
replacement, follow the self-calibration procedure
detailed at the end of this chapter. These test
procedures are based on the prerequisite that
the functions are enabled and have initial set-
tings as shown in Table 7-1, Initial Settings, the
default, as-shipped configuration. (Functions with
two available setpoints have only setpoint #1
enabled.)
Before beginning these test procedures, examine
the DIP switch settings by going to the SETUP
UNIT menu and selecting DIP SWITCH SETTINGS.
If switches 4 and 5 are shown to be ON (down),
remove the unit from its case and reset them to
OFF. The applied test voltages and the M-0420
responses defined below are valid
only for the
three-phase line-to-neutral configuration. If the unit
is intended for line-to-line service, reset the DIP
switches after completing the tests.