CIRCUTOR, SA reserves the right to make modifications to the device or the unit specifications set out in this instruction manual without prior notice. CIRCUTOR, SA on its web site, supplies its customers with the latest versions of the device specifica- tions and the most updated manuals.
Changes in the following sections: 06/15 M013B01-03-15C 4.8 - 5 Changes in the following sections: 02/16 M013B01-03-16A 4.2 - 4.8.1. 11/21 M013B01-03-21A Circutor logo change Note: Device images are for illustrative purposes only and may differ from the actual device. Instruction Manual...
CIRCUTOR's after-sales service. 2.- PRODUCT DESCRIPTION The MDC-4 unit controls maximum power demand, both in single and three-phase installations with and without neutral. The unit is equipped with a power analyzer that measures electrical parameters at the connection point. The measurement is taken in RMS, via four AC voltage inputs and four current inputs.
The MDC-4 unit must be installed by authorised and qualified staff. The power supply plug must be disconnected and measuring systems switched off before handling, altering the connections or replacing the unit.
MDC-4 3�4�- CONNECTION DIAGRAM 3�4�1�- THREE-PHASE NETWORK MEASUREMENT WITH A 4-WIRE CONNECTION� LOAD OUT 4 MDC-4 OUT 3 OUT 2 OUT 1 Power Supply OUT 4 OUT 3 OUT 2 OUT 1 Figure 2: Three-phase network measurement with a 4-wire connection�...
MDC-4 3�4�2�- THREE-PHASE NETWORK MEASUREMENT WITH A 3-WIRE CONNECTION� LOAD OUT 4 MDC-4 OUT 3 OUT 2 OUT 1 Power Supply OUT 4 OUT 3 OUT 2 OUT 1 Figure 3: Three-phase network measurement with a 3-wire connection� The MC3 transformer secondary value is set to 0.250 A.
MDC-4 3�4�3�- SINGLE-PHASE NETWORK MEASUREMENT� LOAD OUT 4 MDC-4 OUT 3 OUT 2 OUT 1 Power Supply OUT 4 OUT 3 OUT 2 OUT 1 Figure 4: Single-phase network measurement� The MC1 transformer secondary value is set to 0.250 A.
MDC-4 4.- OPERATION 4�1�- OPERATING PRINCIPLE The MDC-4 has been designed to control the maximum demand of an installation. The unit is equipped with a power analyzer that measures electrical parameters at the connection point. The unit calculates the maximum demand by scrolling window, do not need a sync pulse.
MDC-4 The graph in shows the unit's response: Figure 6 Figure 6: Graph with the response of the MDC-4 4�2�- PARAMETERS The unit displays the electrical parameters shown in Table 3 Table 3: MDC-4 measuring parameters� Phases Total Measuring parameter...
MDC-4 4�3�- KEYS FUNCTIONS The MDC-4 has 4 keys that allow you to browse the various screens and program the unit. Key functions on the measuring screens ( Table 4 Table 4: Key functions on measuring screens� Long keystroke Short keystroke...
MDC-4 OUT 4 OUT 3 OUT 2 OUT 1 Figure 7: LED indicators� 4�6�- DISPLAY IMPROVEMENTS The unit has two types of screens for viewing: Maximum demand screens. Measuring screens. 4�6�1�- MAXIMUM DEMAND SCREENS� Use keys to browse the various screens.
MDC-4 4�6�2�- MEASURING SCREENS� Use keys to browse the various screens. The maximum demand screens are viewed by pressing the keys. Table 7: Measuring screens� Screen Parameters (units) : Phase-Phase Voltage L1-L2 (V). vL12 vL23 vL31 VL12 : Phase-Phase Voltage L2-L3 (V).
Configure the output relays. The MDC-4 does not record the programming changes until all parameters have been programmed. If the unit is RESET before programming all parameters or no key is pressed for 60 seconds, the configu- ration will not be stored in the memory and relays return to its resting state for a short time.
MDC-4 4�8�2� SELECTING THE MAXIMUM DEMAND VARIABLE In this step the variable for calculation the maximum demand is programmed. SET PD V Press the button to select between the possible P (W) options: W: Active power. VA: Apparent power. mA: Current III Press the key to access the next programming step.
MDC-4 Press key to access the next programming step. 4�8�6� DELETING THE ENERGY VALUE In this step you select whether or not to delete the energy value. Clea Energy Press the button to select between the two pos- sible options: No or Yes.
MDC-4 When the desired value is shown on the screen, move onto the next digit by pressing the key to modify the remaining values. Maximum value: 99 %. Minimum value: 0 %. Press key to access the next programming step.
4�9�- PROGRAMMING THE CURRENT DATE AND TIME The MDC-4 does not record the programming changes until all parameters have been programmed. If the unit is RESET before programming all parameters or no key is pressed for 60 seconds, the configu- ration will not be stored in the memory.
MDC-4 4�9�3� YEAR In this step the current year is programmed. SET YEA Press the button to increase the digit that is 2014 currently flashing. When the desired value is shown on the screen, move onto the next digit by pressing the key to modify the remaining values.
MDC-4 5.- TECHNICAL FEATURES AC power supply Rated voltage 110 ...240 V ~ Frequency 50 / 60Hz Consumption 4...6 VA Installation category CAT III 300 V Voltage measurement circuit Rated voltage (Un) 300 V P-N, 520 V P-P Voltage measurement margin 5 ...
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MDC-4 Figure 8: Dimensions of the MDC-4� Standards Safety requirements for electrical equipment for measurement, control UNE-EN 61010-1:2011 and laboratory use -- Part 1: General requirements Electromagnetic compatibility (EMC) -- Part 4-2: Testing and measurement UNE-EN 61000-4-2:2010 techniques - Electrostatic discharge immunity test...
MDC-4 6.- MAINTENANCE AND TECHNICAL SERVICE In the case of any query in relation to device operation or malfunction, please contact the CIRCUTOR, SA Technical Support Service. Technical Assistance Service Vial Sant Jordi, s/n, 08232 - Viladecavalls (Barcelona) Tel: 902 449 459 ( España) / +34 937 452 919 (outside of Spain) email: sat@circutor.com...
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