Motor Overload Calculation To Ul - Jetter JM-206-230 User Manual

JetMove 206B-230
5.2.3
The UL standard prescribes a motor overload detection for a servo amplifier
according to the following criteria:
The "trip current" is defined to be 1.15 times the user-set continuous rated current-
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This protection (error message 31 is activated) can be parameterized only through
the rated current value.
The motor overload protection is always active and cannot be deactivated.
Important
Jetter AG

Motor Overload Calculation to UL

If the average motor current corresponds to the trip current, the overload
protection has to switch off the motor after a limited time.
If the average motor current is 2 times higher than the trip current the overload
protection has to switch off the motor after at least 8 minutes.
If the average motor current is 6 times higher than the trip current the overload
protection must switch of the motor after at least 20 seconds.
Because of the fact that after reset the motor overload calculation always starts
with zero, the result is wrong if the motor is already hot when the digital servo
amplifier JetMove 206B-230 is switched on (i. e. at the time of connecting the
24 V logic power supply).
5.2 Motor Protection
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