Thermistor/Rtd Inputs; Overload Alarm And Trip Curves; Current Unbalance Alarm And Trip; Fault Time Delays - P&B MPC2000D Manual

3.1.5. Thermistor/RTD Inputs

Time Delay:
Thermistors
Range:
Accuracy:
RTD's
Range:
Accuracy:
Max. Wire Resistance:

3.1.6. Overload Alarm and Trip Curves

Fault Time Accuracy:
Threshold Current Level: Overload Setting +/- 1.5%

3.1.7. Current Unbalance Alarm and Trip

Method:
Alarm
Threshold Unbalance Level:
Fixed Time Delay Accuracy:
Trip Curves
Threshold Unbalance Level:
Trip Time Accuracy:

3.1.8. Fault Time Delays

Accuracy:
Exceptions
High Set Over-current:
Earth Fault Trip:
Accuracy:
MPC2000D
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.
+/- 0.5 seconds or +/- 2% of time
-0.1 to +0.2 sec. up to 1 second
-0.1 to +0.2 sec. for less than
1 second delayTotal Run Time
+/- 2%
Issue 2 22/4/98 Page 5