User Manual

Rockwell Automation Publication 193-UM002I-EN-P - December 2011 49
Protective Trip & Warning Functions Chapter 3
Auto/Manual Reset
OL/PTC ResetMode, Parameter 30, allows the user to select the reset mode for
the E3 Overload Relay after an overload or thermistor (PTC) trip. If an overload
trip occurs and automatic reset mode is selected, the E3 Overload Relay will
automatically reset when the value stored in % Therm Utilized, Parameter 9, falls
below the value stored in OL Reset Level, Parameter 31. If manual reset mode is
selected, the E3 Overload Relay can be manually reset after the % Therm Utilized
is less than the OL Reset Level.
OL Reset Level, Parameter 31, is adjustable from 1 to 100% TCU. The following
table illustrates the typical overload reset time delay when OL Reset Level is set to
75% TCU.
Table 20 - Typical Overload Relay Reset Time Delays
For reset time delays corresponding to other OL Reset Level settings, see the
following charts.
Trip Class Reset Delay Time in Seconds ➊
545
10 90
15 135
20 180
30 270
➊ Times shown are based on OL Reset Level, Parameter 31, being set to 75% TCU.