MPS3000 TERMINALS
Page 10 of 67
MPS3000 TERMINALS
Auxiliary Power Supply
85…230VDC or AC (50/60) Hz With option (-S) for separate Aux. Power Supply and Control
Phase or DC (+) ...................................... 61 Voltage:
Neutral or DC (-) .................................... 62 Phase or DC (+) ...................................... 64
Ground .................................................... 63 Neutral or DC (-) .................................... 65
Current & Voltage & Temperature (RTD, Thermistor) inputs
The MPS3000 can measure: Three voltages analog inputs, four currents analog inputs and ten temperature
sensors. True RMS measurement is used both for voltages and currents. Frequency should be in the range of
45-66 Hz. All current and voltage analog inputs incorporate internal isolating transformers.
Line Voltages
Direct connection of line to line voltages up to 690 VAC. For higher voltages, up to 25 KV, V/Ts must be used.
Voltage terminals are:
Phase L1 .................................................78
Phase L2 .................................................79
Phase L3 .................................................80
Neutral (when used)….......................... 81
Notes:
1. Line voltages must be connected for frequency sensing. If voltage analog inputs are not available,
currents measurement is accurate only if frequency is 50Hz or 60Hz, as set.
2. For low voltage mains, all three phase voltages must be connected as shown in the wiring diagram.
3. For Medium and high voltage systems, when only a single V/T is used:
• Connect "V/T" primary to mains V12 (“live” to V1 and “return” to V2).
• Connect "V/T" secondary: “live” to phase voltage inputs (78, 79, 80) and “return” to neutral input
(81).
• Decrease primary voltage setting by a 1.73 factor. In this type of connection, Line to Line voltage
is connected to Line to Neutral input.
• MPS3000 cannot detect phase sequence. A positive phase sequence is assumed.
For Medium and high voltage systems, when system voltage VTs are not available and AC power supply is used, connect
auxiliary power supply (61) to phase voltage inputs (78,79, 80) and (62) to neutral input (81).
Line Currents
Currents measured through "C/T" secondary of 5 A or 1 A.
Phase L1 ... 1 a, 5 a, Comm. ................. 82, 83, 84
Phase L2 ... 1 a, 5 a, Comm. ................. 85, 86, 87
Phase L3 ... 1 a, 5 a, Comm. ................. 88, 89, 90
Note :
Power and Power Factor can be calculated only if three voltage inputs and three current inputs are applied to the
MPS3000
.
Ground Fault Current
Currents measured through a differential "C/T" with a secondary of 5 A or 1A.
All phases..1 A, 5 A, COMM.................. 91, 92, 93
Note: It is recommended to use Core Balance "C/T". If a Core Balance "C/T" is not available, Ground Fault can
be measured according to "C/T" Wiring Diagrams on Page 14.
Temperature Sensors
The MPS3000 can accept inputs from Up to 10 RTDs of the following types:
• Copper 10 Ohm
• Platinum 100 Ohm
• Nickel 120 Ohm
LCD display is in °C (see temperature table on page 40).
Notes:
1. All sensors must be of same type.
2. An optional unit with 6 RTDs and 4 thermistors (No. 7...No. 10) is available.
RTDs three wire measurement system is used to compensate for cable resistance. (max. cable resistance
allowed is 25% of sensor resistance at 0°C). Only two wires are used for thermistor.
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