Rockwell Automation 193 193-5.0: Bulletin 913/592 SMP-3 Solid-State Overload Relay - Manual (Page 49)

4
Chapter
Functional Description
4-1
CHAPTER OBJECTIVES
This chapter describes the functionality and features of the
SMP-3 overload relay.
SMP-3 INPUTS/OUTPUTS
Configuration Dip Switches
The SMP-3 overload relay contains 14 configuration DIP
Switches. The six left-most DIP switches are used to configure
the trip class (2), establish the Auto/Man Reset Mode (1),
enable/disable Ground Fault (1), enable/disable Jam/Stall (1),
and to induce a Test Trip (1). The eight right-most DIP
switches are used to establish the SMP-3 FLC setting. See
Chapter 3 for further details on configuring the SMP-3.
Note: The SMP-3 overload relay continually monitors the DIP
switches for configuration changes, thus enabling the user to
make configuration changes on-the-fly.
Note: If the FLC setting is set lower than the minimum
allowable setting for longer than five seconds, the SMP-3 will
trip on an “Illegal FLC Set” fault (F6).
Power Supply
The SMP-3 overload relay contains a 120/240V AC universal
input power supply across control terminals 50 and 60 (See
Chapter 3 for control terminal block designations, wire size,
and tightening torque information). The SMP-3 will not
function if the correct control voltage is not applied to these
terminals (See Appendix A for control voltage specifications).
OUT A and B
The SMP-3 overload relay contains two triacs, OUT A and
OUT B, that are located across terminals 10 and 50 (OUT A)
and 20 and 50 (OUT B), with a user-replaceable fuse common
to both outputs. Since the outputs were intended to provide
coil control capability, the triacs within each SMP-3 overload
relay were designed to control the 120 or 240V AC coil of the
largest contactor which that SMP-3 can be mounted to (See
Appendix A for OUT A and B ratings and recommended
fusing).
When power is first applied to the SMP-3 overload relay, OUT
A and OUT B will remain in their OFF condition. A user can
only turn OUT A or OUT B ON through the use of a
communication adapter. Once turned ON, OUT A and OUT B
will remain ON until they are turned OFF, the SMP-3 is
de-energized, or until the SMP-3 overload relay faults. Similar
to the Trip Relay, the SMP-3 overload relay will turn both OUT
A and OUT B OFF when a fault occurs. Unlike the Trip Relay,
however, OUT A and B will remain OFF after the fault is
cleared; OUT A and B will not turn ON until commanded to
do so.