sepam 20 user manual - Schneider Electric

DE80237
Machine operation
assistance functions
or Is
PCRED301005EN - 06/2008
Starting current and
starting / overload time
Operation
The starting time is defined as follows:
b If the locked rotor/excessive starting time protection (ANSI code 48/51LR) is
active, the starting time is the time separating the moment when one of the 3 phase
currents exceeds Is and the moment when the 3 currents drop back below Is, Is being
the value of the current set point for protection function 48/51LR.
b If the locked rotor/excessive starting time protection (ANSI code 48/51LR) is not
active, the starting time is the time separating the moment when one of the 3 phase
currents exceeds 1.2 Ib and the moment when the 3 currents drop back below 1.2 Ib.
The maximum phase current obtained during this time corresponds to the starting
current.
Both values are saved in the event of a power failure.
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
Starting / overload time
Measurement range 0 to 300 s
Unit s or ms
Display format 3 significant digits
Resolution 10 ms or 1 digit
Refresh interval
Starting / overload current
1 second (typical)
Measurement range 48/51LR active Is to 24 In (1)
48/51LR inactive 1.2 Ib to 24 In (1)
Unit A or kA
Display format 3 significant digits
Resolution 0.1 A or 1 digit
Refresh interval
(1) Or 65.5 kA.
1 second (typical)
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