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In the MPS3000, each one of the Discrete inputs A...D can be configured for an External Fault.
The MPS3000-C, has additional three inputs specifically designed for external faults 1...3.
Auto reset of External Fault x, when Enabled, occurs when the "External Fault x" input circuit opens.
Temperature 1.. 10 Level 1.. 2 (T1..T10 Level 1.. Level 2 )
High temperature condition is detected according to RTD measured resistance (RTD is a positive temperature
coefficient device). For
Tx level 1 (2) fault condition is detected when the measured resistance of any channel x exceeds its Tx Level
1 (2) setting. Fault occurs after a fixed time delay of 2 seconds.
Auto reset, when Enabled, occurs when RTD resistance decreases below RTD x level 1 (2).
Notes:
1. A different model of MPS3000 incorporates six RTD input circuits plus four Thermistor input circuits.
When this type of unit is used, PTC (Positive Temperature Coefficient) or NTC (Negative Temperature
Coefficient) types of thermistors can be selected. If PTC is selected, Fault occurs when resistance is
above the set value. If NTC is selected, fault occurs when resistance is below the set value.
2. If the RTD connector is suddenly disconnected, the MPS reads????. If Level 1 is set as Alarm and Level
2 is set as Trip the MPS3000 will cause Alarm only and will not Trip.
Table shows the resistances of the three commonly used types of RTDs.
Please note that Copper RTD requires different model of MPS3000 than the PT100 or Ni120.
Resistance/Temperature Conversion Table
TEMP
(°C)
Copper 10
Ohms
Pt.100
Ohms
(DIN 43760)
Ni 120
Ohms
0
9.04
100.00
120.00
10 9.42 103.90 127.17
20 9.81 107.79 134.52
30 10.19 111.67 142.06
40 10.58 115.54 149.80
50 10.97 119.40 157.75
60 11.35 123.24 165.90
70 11.74 127.07 174.27
80 12.12 130.89 182.85
90 12.51 134.70 191.64
100 12.90 138.50 200.64
110 13.28 142.29 209.85
120 13.67 146.06 219.29
130 14.06 149.82 228.95
140 14.44 153.58 238.84
150 14.83 157.32 248.95
160 15.22 161.04 259.30
170 15.61 164.76 269.89
180 16.00 168.46 280.77
190 16.39 172.16 291.95
200 16.78 175.84 303.46
Under Power Level 1
For a running motor, fault occurs when motor power decreases below "Under Power Level 1" setting for a
period of time longer than "U/P Level 1 Delay" setting.
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