Figure 3.9-1 Logic Diagram: Thermal Overload Protection (49S) - Siemens 7SR224 Description & Operation

which 100% of thermal capacity will be reached after a period of time and it is therefore normally set
slightly above the full load current of the protected device.
The thermal state may be reset from the fascia or externally via a binary input.
Thermal overload protection can be inhibited from:
Inhibit 49
49 Therm. Overload
Enabled
Disabled
Inhibit 49
©2009 Siemens Protection Devices Limited
A binary or virtual input.
49 Overload Setting
49 Time Constant
49 Capacity Alarm
&
c
IL1
IL2
IL3
Figure 3.9-1 Logic Diagram: Thermal Overload Protection (49S)
cap alarm
trip
cap alarm
trip
cap alarm
trip
(1) Description of Operation 7SR224
1
49 Alarm
1
49 Trip
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