S611 Soft Starter MN03902011E—May 2012 www.eaton.com 49Appendix B—ProtectionThermal OverloadThe S611 soft starter features an electronic motor overloadprotection feature. This is intended to protect the motor andpower wiring against overheating caused by excessivecurrent for extended periods of time.Note: Short-circuit protection must be applied on the lineside of the soft starter.Enter the motor full load current rating, using the Overld TripFLA parameter to program the trip current. It isprogrammable from 50–100% of the unit’s rated current.Overload—Adjustment RangeWARNINGSetting the Overload Trip Class parameter to OFFdisables this feature resulting in no thermal overloadprotection for the motor.The thermal overload is designed to protect the motor fromoverheating caused by excessive current. If the motor isoverloaded, the current drawn rises and heats the motor. TheFLA sets the trip threshold and the trip class (OFF, 5 0 30) isset with the Ovrld Trip Class parameter.If the device is shut down when the overload fault is tripped,the temperature is also saved to the non-volatile memory. Ifthe device is left to cool and then powered, the temperatureread from the sensor is compared to the saved temperature.If the current temperature is 87% or less of the savedtemperature, a full thermal memory reset is initiated.Frame Size FLA Current Range Catalog NumberA 26–52A S611A052N3S32.5–65A S611A065N3S38.5–77A S611A077N3SB 48–99A S611B099N3S62.5–125A S611B125N3SC 78–156A S611C156N3S90–180A S611C180N3SD 120–242A S611D242N3SE 151–302A S611E302N3S180.5–361A S611E361N3SF 207–414A S611F414N3Swww.comoso.com
