Appendix B—Protection
56 S811+ Soft Starter MN03900001E—November 2012
Once the trip level reaches level 3, it will take 144 minutes to
go back to level 2, then 96 minutes to get back to level 1. To
get from level 3 to a reset thermal overload at level 1, it takes
240 minutes without a trip. A reset thermal overload at level
1 means the next thermal overload trip will have a 3-minute
reset inhibit as in the table below.
Thermal Motor Overload Times
Total 240 minutes to reset to level 1.
Cycling power on the device will NOT clear the thermal trip.
The thermal memory and the reset inhibit time are saved to
the non-volatile memory. These values are reloaded when
the device boots and the timer is restarted at the full reset
time. This means if the 3-minute inhibit timer has been
running two minutes, cycling power will require the user to
wait the full three minutes before a reset can clear the
overload fault.
If the device is shut down when the overload fault is tripped,
the temperature is also saved to the non-volatile memory. If
the device is left to cool and then powered, the temperature
read from the sensor is compared to the saved temperature.
If the current temperature is 87% or less of the saved
temperature, a full thermal memory reset is initiated.
Trip
Level Preset Inhibit Time
Reset Time to Previous
Trip Level
13 minutes N/A
2 6 minutes 96 minutes
3 9 minutes 144 minutes
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