Rockwell Automation 825 Smart Motor Manager User Manual - Manual (Page 51)

Functions 3-18
Publication 825-UM001B-EN-P January 2001
Indication of the Time to Tripping
LCD:
This feature provides continuous indication of the time remaining before tripping when in an
overload condition. This enables you to intervene before tripping occurs. (Blank display
means: Time > 9 999 s)
Indication of the Time until the Thermal Trip can be Reset
LCD:
Following a thermal trip, the basic unit may not be reset until the reset threshold has been
reached. This is set to a temperature rise of 50% in the factory.
Adjustable Setting Characteristic
The degree of inertia can be set to match the properties of the motor. A suitable reference
value, among others, is the admissible locked-rotor time of the cold motor in conjunction
with the associated current. This makes it possible to protect motors that are thermally very
fast or very slow. See Figure 3.8, Figure 3.9, and Figure 9.15.
The thermal capacity of the iron is particularly important at small overloads. Allowing for this
in the simulation enables the overload reserves of the motor to be utilized without risking a
premature protective trip.
TRIP IN…sec
RESET IN …sec