WEG SSW-06.0205 User Manual page 119

CHAPTER 6 - DETAILED PARAMETER DESCRIPTION
Parameter
P641 (1)
Auto Reset of the
Thermal Memory
120
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Range
[Factory Setting]
Unit Description / Notes
 Sets the time for the auto-reset of the thermal image of the motor.
1 to 600
 This function can be used for applications that require several starts
[ 0=Inactive ]
1s per hour or those with short intervals of time between starting and
stopping the motor.
 The motor cooling curves are based on many years of experience of
WEG developing motors. They adopt the Standard IP55 Three Phase
Motors with temperature elevation of 60K as a standard. They also
consider if the motor is cooling when switched on or not.
 The thermal image cooling time depends on the power of the motor, in
other words, for each power there is a different cooling time.
 The thermal image can also be reset if parameter P640=0 is
programmed returning to the desired Thermal Class afterwards.
NOTE!
As there are several Thermal Protection Classes, you must
program that Thermal Protection Class that best meets you
application and protects the motor during its allowed duty.
NOTE!
The SSW-06 Soft-Starter thermal class times are an evolution of
the previous WEG soft-starters, therefore the times are different
than those of the SSW-03 and SSW-04. The class to be adopted
must be in accordance with the SSW-06 graphs.
NOTE!
When using a motor with a PTC thermal sensor or thermostat
entirely connected to the SSW-06 Soft-Starter, there is no need
to enable the Thermal Classes, therefore set P640=0.
Motor
On
Off
Actuation
Level
Motor
On
Off
Actuation
Level
auto-reset
Time
Figure 6.30 - Auto-reset of the thermal memory
NOTE!
Please consider that when using this function, the life time useful
life of the motor winding can be reduced.
t
E05
t
whithout
reset
t
E05
with reset t