S611 Soft Starter MN03902011E—May 2012 www.eaton.com 49
Appendix B—Protection
Thermal Overload
The S611 soft starter features an electronic motor overload
protection feature. This is intended to protect the motor and
power wiring against overheating caused by excessive
current for extended periods of time.
Note: Short-circuit protection must be applied on the line
side of the soft starter.
Enter the motor full load current rating, using the Overld Trip
FLA parameter to program the trip current. It is
programmable from 50–100% of the unit’s rated current.
Overload—Adjustment Range
WARNING
Setting the Overload Trip Class parameter to OFF
disables this feature resulting in no thermal overload
protection for the motor.
The thermal overload is designed to protect the motor from
overheating caused by excessive current. If the motor is
overloaded, the current drawn rises and heats the motor. The
FLA sets the trip threshold and the trip class (OFF, 5 0 30) is
set 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. 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.
Frame Size FLA Current Range Catalog Number
A 26–52A S611A052N3S
32.5–65A S611A065N3S
38.5–77A S611A077N3S
B 48–99A S611B099N3S
62.5–125A S611B125N3S
C 78–156A S611C156N3S
90–180A S611C180N3S
D 120–242A S611D242N3S
E 151–302A S611E302N3S
180.5–361A S611E361N3S
F 207–414A S611F414N3S
www.comoso.com
To Next Page
Loading...
