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MPC2000+ Technical Manual
3.3. Earth Fault Current Inputs
Method:
Range:
Full Scale:
Accuracy:
3.4. Line Voltage Inputs
Method:
Without VT Transformer
Range:
Accuracy:
With VT Transformer
Range:
Accuracy:
3.5. Thermistor/RTD Inputs
Time Delay:
Thermistors Range:
Accuracy:
RTD's Range:
Accuracy:
Max. Wire Resistance:
3.6. Overload Alarm and Trip Curves
Fault Time Accuracy:
Threshold Current Level: Overload Setting +/- 1.5%
3.7. Current Unbalance Alarm and Trip
Method:
Alarm
Threshold Unbalance Level:
Fixed Time Delay Accuracy:
Trip Curves
Threshold Unbalance Level:
Trip Time Accuracy:
Page 4
True RMS, sample time 0.5mS
0.05 to 1.0 x E/F CT Primary
1.0 x E/F CT Primary Amps Setting
+/- 1.5% of Full Scale
True RMS, sample time 0.5mS
90 - 660V AC
+/- 1.0% of Full Scale
90 - 660V x (VT Primary/VT Secondary)
Limited to 25kV
+/- 1.0% of Full Scale
0.5 +/- 0.2 seconds
0.1 - 30 Kilo-Ohms
+/- 0.1 Kilo-Ohm up to 5 Kilo-Ohm
+/- 3% above 5 Kilo-Ohm
100 to 240 Ohms
+/- 3%
25 Ohms
+/- 1 second up to 10 seconds
+/- 1 second +/- 2% above 10 seconds
Unbalance = 100 x (Imax - Imin) / Ir %
Where Imax = max. of 3 phase currents
Imin = min. of 3 phase currents
Ir = Larger of Imax or Motor FLC
50% of Unbalance current +/- 2%
1.0 +/- 0.5 seconds
Unbalance Current Setting +/- 2%
+/- 1 second up to 10 seconds
+/- 1 second +/- 2% above 10 sec.
ISSUE 7 28/9/99
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