Thermal Overload (49) - Siemens Solkor 7PG2113 Technical Manual

2.13 Thermal Overload (49)

Voltage Inputs:
Current Inputs:
Disable:
Map Pickup LED:
The current can be applied from a 3P balanced supply or phase by phase from a 1P supply. Alternatively the 3
phase current inputs can be connected in series and injected simultaneously from a single 1P source.
The Thermal Overload Setting and Time Constant Setting can be considered together to calculate the operating
time for a particular applied current.
The following table lists operate times for a range of Time Constant Settings for an applied current of 2x the
Thermal Overload setting. Ensure that the thermal rating of the relay is not exceeded during this test.
©2012 Siemens Protection Devices Limited
Figure 2.13-1 Thermal Overload
n/a
I (I ), I (I ), I (I ),
L1 A L2 B L3 C
51, 50, 37, 50CBF
49Alarm
7PG2113/4/5/6 Commissioning & Maintenance
Chapter 6 Page 52 of 77