Rockwell Automation 193 193-5.0: Bulletin 913/592 SMP-3 Solid-State Overload Relay - Manual (Page 54)

Chapter 4 – Functional Description
4-6
Auto/Man Reset. The Auto/Man configuration DIP switch is
used to select the overload reset mode of the SMP-3 overload
relay. If Auto Reset (automatic reset) mode is selected, the
SMP-3 overload relay will automatically reset after an overload
fault after the appropriate reset delay time has expired.
Class
Reset Delay Time
(seconds)
10 90
15 135
20 180
30 270
If Man Reset (manual reset) mode is selected, the SMP-3
overload relay must be manually reset after an overload fault.
The user, however, can not manually reset an overload fault
until the appropriate reset delay time has expired. (See Chapter
9 for instructions on “How to Clear a Fault”)
Note: The Auto/Man Reset configuration only affects the reset
mode of an overload fault. All other faults must be manually
reset.
Note: An overload fault can never be reset until the
appropriate reset delay time has expired.
Phase Loss Protection
Phase Loss protection is an embedded feature of the SMP-3
overload relay. The SMP-3 overload relay provides phase loss
protection by monitoring the average current through the
SMP-3 overload relay and the current unbalance between each
phase. The SMP-3 overload relay will trip on a phase loss fault
(F3) if the following conditions exist:
% Current Unbalance (%CU) > 50% for one
second continuously
Note: The Phase Loss protection is inhibited until the SMP-3
overload relay operates with sufficient current (
≥
30% of the
FLC Setting).
Ground Fault Protection
Ground fault protection is enabled or disabled by placing the
Ground Fault configuration DIP switch in the ON or OFF
position, respectively. When ground fault protection is
enabled, the SMP-3 overload relay will sense an equipment
ground fault condition and trip on a ground fault (F4) if the
following conditions exist:
Ground Fault Level
≥
50% of the FLC Setting for
0.5 seconds continuously
Note: The ground fault protection is inhibited until the SMP-3
overload relay has been operating with sufficient current (
≥
30% of the FLC Setting) for at least one trip class duration.