206 Parameters
35.55 Motor thermal time
constant
Defines the thermal time constant for use with the motor
thermal protection model, defined as the time to reach 63% of
the nominal motor temperature. See the motor
manufacturer's recommendations.
For thermal protection according to UL requirements for
NEMA class motors, use the rule of thumb: Motor thermal
time equals 35 times t6, where t6 (in seconds) is specified by
the motor manufacturer as the time that the motor can safely
operate at six time its rated current.
The thermal time for Class 10 trip curve is 350 s, for Class 20
trip curve 700 s and for Class 30 trip curve 1050 s.
256 s
100…10000 s Motor thermal time constant. 1 = 1 s
36
36 Load analyzer
Peak value and amplitude logger settings.
See also section Load analyzer (page 93).
36.01 PVL signal source Selects the signal to be monitored by the peak value logger.
The signal is filtered using the filtering time specified by
parameter 36.02 PVL filter time.
The peak value is stored, along with other pre-selected
signals at the time, into parameters 36.10…36.15.
The peak value logger can be reset using parameter 36.09
Reset loggers. The logger is also reset whenever the signal
source is changed. The date and time of the last reset are
stored into parameters 36.16 and 36.17 respectively.
Output power
Not selected None (peak value logger disabled). 0
Motor speed used 01.01 Motor speed used (page 103). 1
Reserved 2
Output frequency 01.06 Output frequency (page 103). 3
Motor current 01.07 Motor current (page 103). 4
Reserved 5
Motor torque 01.10 Motor torque (page 103). 6
No. Name/Value Description Def/FbEq16
100%
63%
100%
Time
Time
Motor thermal time
Motor current
Temperature rise
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