sepam 20 user manual - Schneider Electric
sepam 20 user manual - Schneider Electric
sepam 20 user manual - Schneider Electric
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2<br />
Metering functions Frequency<br />
Temperature<br />
2/8<br />
Frequency<br />
Operation<br />
This function gives the frequency value.<br />
Frequency is measured via the following:<br />
b based on U21, if only one phase-to-phase voltage is connected to the Sepam<br />
b based on positive sequence voltage, if the Sepam includes U21 and U32<br />
measurements.<br />
Frequency is not measured if:<br />
b the voltage U21 or positive sequence voltage Vd is less than 40 % of Un<br />
b the frequency is outside the measurement range.<br />
Readout<br />
The measurement may be accessed via:<br />
b the display of a Sepam with advanced UMI by pressing the key<br />
b the display of a PC with the SFT2841 software<br />
b the communication link<br />
b an analog converter with the MSA141 option.<br />
Characteristics<br />
Rated frequency 50 Hz, 60 Hz<br />
Range 50 Hz 45 Hz to 55 Hz<br />
60 Hz 55 Hz to 65 Hz<br />
Accuracy (1) ±0.05 Hz<br />
Display format 3 significant digits<br />
Resolution 0.01 Hz or 1 digit<br />
Refresh interval 1 second (typical)<br />
(1) At Un in reference conditions (IEC 60255-6).<br />
Temperature<br />
Operation<br />
This function gives the temperature value measured by resistance temperature<br />
detectors (RTDs):<br />
b platinum Pt100 (100 Ω at 0 °C or 32 °F) in accordance with the IEC 60751 and<br />
DIN 43760 standards<br />
b nickel 100 Ω or 1<strong>20</strong> Ω (at 0 °C or 32 °F).<br />
Each RTD channel gives one measurement:<br />
b tx = RTD x temperature.<br />
The function also indicates RTD faults:<br />
b RTD disconnected (tx > <strong>20</strong>5 °C or 401 °F)<br />
b RTD shorted (tx < -35 °C or -31 °F).<br />
In the event of a fault, display of the value is inhibited.<br />
The associated monitoring function generates a maintenance alarm.<br />
Readout<br />
The measurement may be accessed via:<br />
b the display of a Sepam with advanced UMI by pressing the key<br />
b the display of a PC with the SFT2841 software<br />
b the communication link<br />
b an analog converter with the MSA141 option.<br />
Characteristics<br />
Range -30 °C to +<strong>20</strong>0 °C<br />
or -22 °F to +392 °F<br />
Accuracy ±2 °C<br />
±1 °C from +<strong>20</strong> to +140 °C<br />
Resolution 1 °C or 1 °F<br />
Refresh interval 5 seconds (typical)<br />
Accuracy derating according to wiring: see chapter "installation of MET148-2<br />
module" page 6/33.<br />
PCRED301005EN - 06/<strong>20</strong>08
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