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CIRCUTOR S�A�U� reserves the right to make modifications to the device or the unit specifications set out in this instruction manual without prior notice. CIRCUTOR S�A�U� on its web site, supplies its customers with the latest versions of the device specifi- cations and the most updated manuals.
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CEM-C21c-MID REVISION LOG Table 1: Revision log� Date Revision Description 02/23 M384B01-03-23A Initial Version SYMBOLS Table 2: Symbols� Symbol Description In compliance with the relevant European directive. Device covered by European directive 2012/19/EC. At the end of its useful life, do not leave the unit in a household waste container.
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If any problem is noticed upon reception, immediately contact the transport com- pany and/or CIRCUTOR’s after-sales service. 2.- PRODUCT DESCRIPTION The CEM-C21c-MID is a three-phase static class-B (EN50470) / class-1 (IEC 62053-21) meter for meas- uring active energy, and a Class-1 meter (IEC 62053-23) for measuring reactive energy. The device features:...
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The CEM-C21c-MID device must be installed by authorised and qualified staff. The measuring systems switched off before handling, altering the connections or replacing the device.
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Terminals, opening covers or removing elements can expose parts that are hazardous to the touch while the device is powered. Do not use the device until it is fully installed. 3�3�- DEVICE TERMINALS Table 3: List of CEM-C21c-MID terminals� Device terminals 1: L1, L1 current (voltage) input...
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L1 L2 L3 N Figure 2: Connection diagram, CEM-C21c-MID� 3�5�- CONNECTION The CEM-C21c-MID has terminal covers that cover the top of the terminal box and the fixing screws Figure 3 Figure 3: CEM-C21c-MID terminal covers� Once the device is connected, the option exists to protect it using four connection ( Figure 4 Figure 4: Seal of the CEM-C21c-MID�...
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CEM-C21c-MID 4.- OPERATION The CEM-C21c-MID measures in all 4 quadrants (consumption and generation) using the IEC meas- urement convention. Operation in the 4 quadrants (Q1, Q2, Q3, Q4) cos φ values in the receiver operating mode (Q1,Q4) > cos φ...
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CEM-C21c-MID Table 4 (Continuation): CEM-C21c-MID Measurement parameters� RS-485 Parameter Display Instantaneous Maximum Combined Active Power Maximum Demand Direct Reactive Power Maximum Demand L1. L2, L3 Combined Direct Reactive Power Maximum Demand ...
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15 minutes. The result would be 60 values per hour. Integration period Integration period Sliding window Calculation time Integration period Figure 7:Sliding Window� The calculation method and the integration period of the CEM-C21c-MID are programmed in “ 6.7.- MAXIMUM DEMAND”. Instruction Manual...
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Energy values of L1 Energy values of L2 Energy values of L3 4�2�- KEYBOARD The CEM-C21c-MID has 2 keys to browse through the different screens and set up the device. Keys Figure 9: Keyboard of the CEM-C21c-MID� Instruction Manual...
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The device has two verification LEDs, which emit pulses proportional to the energy measured. LED A LED B Figure 10: LEDs of the CEM-C21c-MID� LED A, to verify active energy. LED B, to verify reactive energy. The weight of the LEDs is 1000 imp/kWh(kvarh).
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4�5�- DIGITAL INPUT The device has a digital input (terminals 17 and 18 in ), to monitor an external alarm, determine Table 3 the status of a switch, etc. 5 V DC COMM 470 Ω Figure 11: Digital input, CEM-C21c-MID� Instruction Manual...
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CEM-C21c-MID 5.- DISPLAY The CEM-C21c-MID has 2 display modes: Screen in standby mode. Screen in read mode. 5�1�- SCREEN IN STANDBY MODE With the screen in standby mode, all the information is displayed cyclically, without having to press any keys on the CEM-C21c-MID.
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CEM-C21c-MID Reactive energy quadrant 2 (kvarh) kvarh kvarh kvarh kvarh Reactive energy quadrant 3 (kvarh) kvarh kvarh kvarh kvarh Reactive energy quadrant 4 (kvarh) kvarh kvarh kvarh kvarh Total Resettable Active Energy (kWh) k W h k W h kW h...
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CEM-C21c-MID Reactive Power Maximum Demand (kvar) kvar Direct Reactive Power Maximum Demand (kvar) kvar Reverse Reactive Power Maximum Demand (kvar) kvar Phase-Neutral Voltage L1 (V) Phase-Neutral Voltage L2 (V) Phase-Neutral Voltage L3 (V) L1 - L2 Phase-Phase Voltage (V) L2 - L3 Phase-Phase Voltage (V)
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CEM-C21c-MID Total Active Power (kW) Note: The - sign indicates reverse power. Active Power L1 (kW) Note: The - sign indicates reverse power. Active Power L2 (kW) Note: The - sign indicates reverse power. Active Power L3 (kW) Note: The - sign indicates reverse power.
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CEM-C21c-MID Total Frequency (Hz) Frequency L1 (Hz) Frequency L2 (Hz) Frequency L3 (Hz) Total Power Factor Note: C indicates Capacitive Power Factor, L Inductive Power Factor, and the - sign indicates that the Active Power is reverse. Power factor L1 Note: C indicates Capacitive Power Factor, L Inductive Power Factor, and the - sign indicates that the Active Power is reverse.
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Energy values L3 > 5 s Manufacturer’s information Figure 12: Navigation diagram of CEM-C21c-MID in read mode� 5�3�- ENERGY VALUES PHASE L1 To access these display screens, do a long press of the , key from the screen in standby mode until...
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CEM-C21c-MID To move through the different screens, do short presses of the keys The display returns to standby mode if no keys are pressed for 60 seconds. The energy values for phase L1 are identified by the symbol on.
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CEM-C21c-MID Total Resettable Active Energy (kWh) k W h k W h kW h kW h Resettable Direct Active Energy (kWh) k W h k W h k W h k W h Resettable Reverse Active Energy (kWh) k W h...
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CEM-C21c-MID 5�4�- ENERGY VALUES PHASE L2 To access these display screens, do a long press of the , key from the screen in standby mode until the initial screen with the energy values for phase L2 is shown, Figure 14 Figure 14: Initial screen of the L2 energy values�...
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CEM-C21c-MID Partial serial number of the device The device’s serial number is: 12+Partial serial number shown on this screen. Modbus: Address of peripheral (ID) Note: Value programmable in section “6.1.- ADDRESS OF PERIPHER- AL (ID)”. Modbus: Baud rate Note: Value programmable in section “6.2.- BAUD RATE”.
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CEM-C21c-MID 6.- CONFIGURATION To access the configuration menu, long press the key from the screen in standby mode Once the home screen is on for a few seconds, the password screen is shown, Figure 17 Figure 17: Initial settings screen�...
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CEM-C21c-MID Use the keys to navigate through the different configuration screens. 6�2�- BAUD RATE This screen is used to select the Baud Rate in the Modbus communication protocol. Make a long press on the key to enter edit mode. Use the keys to change options.
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CEM-C21c-MID Configuration values Table 11: Configuration values: Parity� Parity odd, odd parity Possible values EUEn, even parity nonE, no parity Use the keys to navigate through the different configuration screens. 6�4�- STOP BITS This screen is used to select the number of stop bits in the Modbus communication protocol.
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CEM-C21c-MID To validate the value and exit edit mode, press the key > 3 s, after entering the last digit. Configuration values Table 13: Configuration values: Display time� Display time If the value 0 is set, the device will not shift screens automatically in standby mode.
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CEM-C21c-MID 6�7�- MAXIMUM DEMAND This screen is used to select how maximum demand works. Make a long press on the key to enter edit mode. The first parameter to set, , is the Calculation method of the maximum demand. Use the keys to change options.
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CEM-C21c-MID To validate the value and exit edit mode, press the key > 3 s, after entering the last digit. Configuration values Table 16: Configuration values: Weight of pulse output� Weight of pulse output Minimum value Maximum value 2400 Note: 96000 must be divisible by the value set.
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CEM-C21c-MID Figure 18: Return screen� Use the keys to navigate through the different configuration screens. 6�10�- RESET THE REACTIVE ENERGY This screen is used to delete the value of the resettable reactive energies. kvarh Make a long press on the key to enter edit mode.
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CEM-C21c-MID 6�11�- RESET THE MAXIMUM DEMAND FOR ACTIVE POWER This screen is used to delete the value of the Maximum Demand for Active Power. Make a long press on the key to enter edit mode. The different Active Power Maximum Demand screens are displayed, use the keys browse through the different screens.
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CEM-C21c-MID Make a long press on the key to enter edit mode. The different Reactive Power Maximum Demand screens are displayed, use the keys browse through the different screens. ●●● kvar kvar Table 20: Maximum Demand for reactive Power Reset Screens�...
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CEM-C21c-MID Configuration values Table 21: Configuration values: Access password� Access password Minimum value 0000 Maximum value 9999 Use the keys to navigate through the different configuration screens. 6�14�- EXITING THE MENU This screen is used to exit the setup menu. To save all changes, long press the key.
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7�2�- PROTOCOLO MODBUS The MODBUS protocol is a standard communication protocol in the industry that is used to network multiple devices, with one master and multiple slaves. In the MODBUS protocol, the CEM-C21c-MID uses RTU (Remote Terminal Unit) mode. In RTU mode, message start and end are detected with a 3.5 minimum character silence and the 16-bit CRC error detection method is used.
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Function 03 and 04: Reading registers. Function 10: Write multiple registers. 7�2�1�- READ COMMAND The CEM-C21c-MID supports the integer read functions 0x03 and 0x04. Example: Reading the device’s display code with peripheral number 01. We will send the following Modbus frame: Initial No�...
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CEM-C21c-MID 7�3�- MODBUS COMMANDS All MODBUS map addresses are in hexadecimal. 7�3�1�- INSTANTANEOUS PARAMETERS For these variables, the Read function is implemented. Table 22: Modbus variables: Instantaneous values (Table 1)� Units Description Address Size Phase-Neutral Voltage L1 0x0400, 0x0401 INT32...
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CEM-C21c-MID Table 23: Modbus variables: Instantaneous values (Table 2)� Units Description Instantaneous Maximum Size Direct Active Power Maximum Demand L1 0x043A, 0x043B 0x046A, 0x046B INT32 Direct Active Power Maximum Demand L2 0x043C, 0x043D 0x046C, 0x046D INT32 Direct Active Power Maximum Demand L3...
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CEM-C21c-MID Table 24 (Continued): Modbus variables: Energy parameters (Table 1)� Units Description Address Size Reverse Reactive Energy L1 0x0532, 0x0533 INT32 kvarh x 100 Total Reactive Energy L1 quadrant 1 0x053C, 0x053D INT32 kvarh x 100 Total Reactive Energy L1 quadrant 2...
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0x101D 0: Open, 1: Closed R: Read function implemented, R/W: Read and Write functions implemented. 7�3�4�- CONFIGURATION PARAMETERS The Read and Write functions are implemented for these variables. Table 26:Modbus configuration parameters CEM-C21c-MID� Default Description Address Size Valid data range...
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CEM-C21c-MID Table 26 (Continued): Modbus configuration parameters CEM-C21c-MID� Default Description Address Size Valid data range value Maximum demand integration 0x1011 16 bits 1 ... 30 minutes 15 min. period Login password 0x1016 16 bits 0000 ... 9999 0000 Weight of pulse output...
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CEM-C21c-MID 8.- TECHNICAL FEATURES Power supply Mode Self-powered 230 V ± 20 % ~ (400 V ± 20 % ~) Rated voltage Ph-Ph Frequency 50 Hz Consumption < 1 W, < 12 VA Voltage measurement Connection Three-phase Reference voltage 3 x 230/400 V ~...
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(classes 2 and 3) Electricity metering equipment - General requirements, tests and test conditions - IEC 62052-11 Part 11: Metering equipment EU Directive 2014/32/EU on Measuring Instruments Annex II, Module B 71.5 Figure 20: Dimensions of the CEM-C21c-MID� Instruction Manual...
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CEM-C21c-MID 9.- MAINTENANCE AND TECHNICAL SERVICE In the case of any query in relation to device operation or malfunction, please contact the CIRCUTOR S�A�U� Technical Support Service. Technical Assistance Service Vial Sant Jordi, s/n, 08232 - Viladecavalls (Barcelona) Tel: 902 449 459 (Spain) / +34 937 452 919 (outside of Spain) email: sat@circutor.com...
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CEM-C21c-MID 11.- EU DECLARATION OF CONFORMITY Instruction Manual...
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