sepam 20 user manual - Schneider Electric

Machine operation
assistance functions
PCRED301005EN - 06/2008
Running hours counter and
operating time
Thermal capacity used
Running hours counter / operating time
The counter gives the running total of time during which the protected device (motor
or transformer) has been operating (I > 0.1Ib). The initial counter value may be
modified using the SFT2841 software.
The counter is saved every 4 hours.
Readout
The measurements may be accessed via:
b the display of a Sepam with advanced UMI by pressing the key
b the display of a PC with the SFT2841 software
b the communication link.
Characteristics
Range 0 to 65535
Unit hours
Thermal capacity used
Operation
The thermal capacity used is calculated by the thermal protection function.
The thermal capacity used is related to the load. The thermal capacity used
measurement is given as a percentage of the rated thermal capacity.
Saving of thermal capacity used
When the protection unit trips, the current thermal capacity used increased by 10 % (1)
is saved. The saved value is reset to 0 when the thermal capacity used has
decreased sufficiently for the start inhibit time delay to be zero. The saved value is
used again after a Sepam power outage, making it possible to start over with the
temperature buildup that caused the trip.
(1) The 10 % increase is used to take into account the average temperature buildup of motors
when starting.
Readout
The measurements may be accessed via:
b the display of a Sepam with advanced UMI by pressing the key
b the display of a PC with the SFT2841 software
b the communication link
b an analog converter with the MSA141 option.
Characteristics
Measurement range 0 to 800 %
Unit %
Display format 3 significant digits
Resolution 1 %
Refresh interval 1 second (typical)
2/11
2