Circutor MDC-4 User manual

INSTRUCTION MANUAL
(M013B01-03-21A)
Maximum demand control
MDC-4

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MDC-4
Instruction Manual

SAFETY PRECAUTIONS
DISCLAIMER
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.
www.circutor.com
CIRCUTOR, recommends using the original cables and accessories that are supplied
with the device.
DANGER
Warns of a risk, which could result in personal injury or material damage.
ATTENTION
Indicates that special attention should be paid to a specific point.
Follow the warnings described in this manual with the symbols shown below.
If you must handle the unit for its installation, start-up or maintenance, the following should be
taken into consideration:
Incorrect handling or installation of the unit may result in injury to personnel as well as damage to the
unit. In particular, handling with voltages applied may result in electric shock, which may cause death
or serious injury to personnel. Defective installation or maintenance may also lead to the risk of fire.
Read the manual carefully prior to connecting the unit. Follow all installation and maintenance in-
structions throughout the unit’s working life. Pay special attention to the installation standards of the
National Electrical Code.
Refer to the instruction manual before using the unit
In this manual, if the instructions marked with this symbol are not respected or carried out correctly, it can result
in injury or damage to the unit and/or installations.
CIRCUTOR, SA reserves the right to modify features or the product manual without prior notification.
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CONTENTS
SAFETY PRECAUTIONS .........................................................................................................................................................3
DISCLAIMER ..........................................................................................................................................................................3
CONTENTS.............................................................................................................................................................................4
REVISION LOG .......................................................................................................................................................................5
1. VERIFICATION UPON RECEPTION....................................................................................................................................6
2. PRODUCT DESCRIPTION .................................................................................................................................................6
3. UNIT INSTALLATION........................................................................................................................................................7
3.1.- PRIOR RECOMMENDATIONS ....................................................................................................................................7
3.2.- INSTALLATION .........................................................................................................................................................7
3.3.- UNIT TERMINALS.....................................................................................................................................................8
3.4.- CONNECTION DIAGRAM...........................................................................................................................................9
3.4.1.- THREEPHASE NETWORK MEASUREMENT WITH A 4WIRE CONNECTION. ...................................................9
3.4.2.- THREEPHASE NETWORK MEASUREMENT WITH A 3WIRE CONNECTION..................................................10
3.4.3.- SINGLEPHASE NETWORK MEASUREMENT. ..................................................................................................11
4. OPERATION ................................................................................................................................................................... 12
4.1.- OPERATING PRINCIPLE .......................................................................................................................................... 12
4.2.- PARAMETERS ........................................................................................................................................................ 13
4.3.- KEYS FUNCTIONS .................................................................................................................................................. 14
4.4.- DISPLAY................................................................................................................................................................. 14
4.5.- LED INDICATORS.................................................................................................................................................... 14
4.6.- DISPLAY IMPROVEMENTS ..................................................................................................................................... 15
4.6.1.- MAXIMUM DEMAND SCREENS........................................................................................................................ 15
4.6.2.- MEASURING SCREENS.................................................................................................................................... 16
4.7.- OUTPUT RELAYS .................................................................................................................................................... 17
4.8.- PROGRAMMING..................................................................................................................................................... 17
4.8.1. CURRENT PRIMARY.......................................................................................................................................... 17
4.8.2. SELECTING THE MAXIMUM DEMAND VARIABLE.............................................................................................18
4.8.3. PERIOD OF MAXIMUM DEMAND INTEGRATION...............................................................................................18
4.8.4. CONTRACTED POWER ...................................................................................................................................... 18
4.8.5. DELETING THE MAXIMUM DEMAND MAXIMUM VALUE. ................................................................................18
4.8.6. DELETING THE ENERGY VALUE ....................................................................................................................... 19
4.8.7. DELETING THE OUTPUT RELAY DISCONNECTION TIMES. ............................................................................... 19
4.8.8. LEVEL OF OUTPUT RELAY NO. 1 ...................................................................................................................... 19
4.8.9. HYSTERESIS OF OUTPUT RELAY NO. 1 ............................................................................................................ 19
4.8.10. DELAY IN CONNECTING OUTPUT RELAY NO. 1 ............................................................................................. 20
4.8.11. DELAY IN DISCONNECTING OUTPUT RELAY NO. 1......................................................................................... 20
4.8.12. STATUS OF THE CONTACTS FOR OUTPUT RELAY NO. 1 ................................................................................ 20
4.9.- PROGRAMMING THE CURRENT DATE AND TIME................................................................................................... 21
4.9.1. DAY .................................................................................................................................................................... 21
4.9.2. MONTH ............................................................................................................................................................. 21
4.9.3. YEAR .................................................................................................................................................................22
4.9.4. TIME..................................................................................................................................................................22
4.9.5. MINUTES ..........................................................................................................................................................22
5. TECHNICAL FEATURES..................................................................................................................................................23
6. MAINTENANCE AND TECHNICAL SERVICE ...................................................................................................................25
7. GUARANTEE...................................................................................................................................................................25
8. CE CERTIFICATE ............................................................................................................................................................26
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REVISION LOG
Table 1: Revision log.
Date Revision Description
09/14 M013B01-03-14A Initial Version
03/15 M013B01-03-15A Changes in the following sections:
3.4.- 4.1.- 4.8.7.
04/15 M013B01-03-15B Changes in the following sections:
4.2.- 4.6.1.- 4.6.2 - 4.8
06/15 M013B01-03-15C Changes in the following sections:
4.8 - 5
02/16 M013B01-03-16A Changes in the following sections:
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.
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1. VERIFICATION UPON RECEPTION
Check the following points upon receiving the unit:
a) The unit meets the specifications described in your order.
b) The unit has not suffered any damage during transport.
c) Perform an external visual inspection of the unit prior to switching it on.
d) Check that it has been delivered with the following:
- An installation guide.
If any problem is noticed upon reception, immediately contact the transport com-
pany and/or 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 current is measured indirectly with efficient transformers of the MC1 and MC3 series.
The unit features:
- 4 output relays, to disconnect and connect the loads.
- 4 keys, to browse through the different screens.
- 5 indicator LEDs, to show the status of the loads and the CPU.
- 1 Display, for viewing all the parameters.
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3. UNIT INSTALLATION
3.1.- PRIOR RECOMMENDATIONS
In order to use the unit safely, it is critical that individuals who handle it follow the
safety measures set out in the standards of the country where it is being used, use the
necessary personal protective equipment, and pay attention to the various warnings
indicated in this instruction manual.
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. It is dangerous to handle the unit while it is powered.
Also, it is critical to keep the cables in perfect condition in order to avoid accidents, personal injury and
damage to installations.
The manufacturer of the unit is not responsible for any damage resulting from failure by the user or
installer to observe the warnings and/or recommendations set out in this manual, nor for damage
resulting from the use of non-original products or accessories or those made by other manufacturers.
If an anomaly or malfunction is detected in the unit, do not use it to take any measurements.
Inspect the work area before taking any measurements. Do not take measurements in dangerous ar-
eas or where there is a risk of explosion.
Disconnect the unit from the power supply (unit and measuring system power supply)
before maintaining, repairing or handling the unit's connections.
Please contact the after-sales service if you suspect that there is an operational fault
in the unit.
3.2.- INSTALLATION
The unit is installed on a DIN rail.
The unit must be mounted inside an electric panel.
The unit must be connected to a power circuit that is protected with gL fuses (IEC 269) or M fuses, with
a rating of 1 to 2 A. It must be fitted with a circuit breaker or equivalent device for disconnecting the
unit from the power supply mains.
The power and voltage measuring circuit must be connected with cables that have a minimum cross-
section of 1mm2.
Terminals, opening covers or removing elements can expose parts that are hazardous
to the touch while the unit is powered. Do not use the unit until it is fully installed.
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3.3.- UNIT TERMINALS
Table 2:List of MDC-4 terminals
Unit terminals
1: VL1, Voltage input L1 13, 14: Relay output 2
3: VL2, Voltage input L2 15, 16: Relay output 1
5: VL3, Voltage input L3 17: Auxiliary Power Supply
6: N, Voltage input neutral 18: Auxiliary Power Supply
8: Relay output 4, NC 21: COM, Common current inputs
9: Relay output 4, C 22: S1, Current input L3
10: Relay output 4, NO 23: S1, Current input L2
11, 12: Relay output 3 24: S1, Current input L1
MDC-4
CPU
OUT 4
OUT 3
OUT 2
OUT 1
13 5 6 9 10 11 12 13 14 15 16 17 18
24 2123 22
8
Figure 1:MDC-4 terminals.
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3.4.- CONNECTION DIAGRAM
3.4.1.- THREEPHASE NETWORK MEASUREMENT WITH A 4WIRE CONNECTION.
MDC-4
CPU
OUT 4
OUT 3
OUT 2
OUT 1
Power
Supply
V L1
L1
L2
L3
3P1 2P1 1P1
3P2 2P2 1P2
N
V L2 V L3 N
LOAD
Brown / Green
Grey / Pink
Green / White Red / Blue
OUT 1OUT 2OUT 3OUT 4
Figure 2: Three-phase network measurement with a 4-wire connection.
The MC3 transformer secondary value is set to 0.250 A.
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3.4.2.- THREEPHASE NETWORK MEASUREMENT WITH A 3WIRE CONNECTION.
MDC-4
CPU
OUT 4
OUT 3
OUT 2
OUT 1
Power
Supply
V L1
L1
L2
L3
3P1 2P1 1P1
3P2 2P2 1P2
V L2 V L3
LOAD
Brown /Green
Grey / Pink
Green /White Red /cBlue
OUT 1OUT 2OUT 3OUT 4
Figure 3: Three-phase network measurement with a 3-wire connection.
The MC3 transformer secondary value is set to 0.250 A.
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3.4.3.- SINGLEPHASE NETWORK MEASUREMENT.
MDC-4
CPU
OUT 4
OUT 3
OUT 2
OUT 1
Power
Supply
VL1
L1
N
S1
S2
P1 P2
N
LOAD
OUT 1OUT 2OUT 3OUT 4
Figure 4: Single-phase network measurement.
The MC1 transformer secondary value is set to 0.250 A.
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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.
Depending on the unit's configuration and bearing in mind the calculated maximum demand, the unit
connects and disconnects the installation's electrical loads (which should not be priority loads) in order
to avoid exceeding the configured maximum power. Load connection or disconnection depends on the
instantaneous level of maximum demand. This system proceeds to disconnect the loads in accordance
with the % maximum demand value measured.
The load control by level ensures that the user does not exceed the contracted power, which generally
implies having to pay high penalties. At the same time, it enables adjusting the contract to the real
power each installation needs and managing the punctual disconnection of some non-priority loads,
which also results in important power savings in the electricity bill.
The unit is equipped with relay outputs for the management of up to 4 electrical loads or load groups.
Example: Let's take an installation such as that shown in Figure 5, in which the level of each of the
output relays has been programmed as follows:
OUT1: 70% of the contracted power.
OUT2: 80% of the contracted power.
OUT3: 90% of the contracted power.
OUT4: 95% of the contracted power.
Figure 5: MDC-4 installation.
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The graph in Figure 6 shows the unit's response:
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.
Measuring parameter Units Phases
L1-L2-L3
Total
III
Phase-neutral voltage V
Phase-phase voltage V
Current A  
Active power W  
Reactive power var  
Apparent power VA 
Cos φ- 
Active Energy kW·h 
Current Date and Time -
Maximum demand parameters Units
Contracted power W/VA/mA
Instantaneous maximum demand W/VA/mA
Status of the output relays -
Maximum demand maximum value W/VA/mA
The % of time that each output relay has been discon-
nected %
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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.
Key Short keystroke Long keystroke
(2 s)
Previous Measuring screen
Next Measuring screen
Previous Maximum demand screen Viewing the maximum demand maximum
value.
Next Maximum demand screen
Opens the programming menu
Opens the menu for programming the
current Date and Time.
Key functions in the programming menus (Table 5):
Table 5: Function of keys.
Key Keystroke
Moves an editable digit
Go to programming screen
Increases the digits (0-9) or rotates between the different options.
4.4.- DISPLAY
The unit has a display of two lines each containing 20 characters, on which all the measuring param-
eters are viewed, in addition to specific information for the control of the unit's relay outputs and the
operation time of each of the loads.
4.5.- LED INDICATORS
The MDC-4 unit features:
- A CPU LED, which indicates that the unit is working correctly when it flashes for 1 second.
- Four LEDs (OUT 1, OUT 2, OUT 3, OUT 4), which indicate whether the load is connected or
disconnected. If the LED is on, this indicates that the load is disconnected.
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CPU
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 and to browse the various screens.
The measuring screens are viewed by pressing the or keys.
Table 6: Maximum demand screens.
Screen Parameters (units)
:60000 :56687
: : : :
Pc: Power contracted by the user (W or VA or mA).
Pd: Instantaneous calculated maximum demand
(W or VA or mA).
o1 ...o4: Status of the output relays:
0 : Load connected
1 :Load disconnected
d max: 
// ::
Holding down the key (2 seconds).
Pd max: Maximum demand maximum value
Date and time when maximum value occurred.
It returns to the contracted power screen after 10 sec-
onds.
% % % %
   
The % of time that each output relay has been discon-
nected since it was connected to the unit or since the
last reset.
The % of time that each output relay has been disconnected and the maximum demand maximum
value that can be reset in the programming menu.
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4.6.2.- MEASURING SCREENS.
Use keys and to browse the various screens.
The maximum demand screens are viewed by pressing the or keys.
Table 7: Measuring screens.
Screen Parameters (units)
vL12 vL23 vL31
519.3 519.8 519.6
VL12: Phase-Phase Voltage L1-L2 (V).
VL23: Phase-Phase Voltage L2-L3 (V).
VL31: Phase-Phase Voltage L3-L1 (V).
vL1 vL2 vL3
299.9 300.0 300.0
VL1: Phase-Neutral Voltage L1 (V).
VL2: Phase-Neutral Voltage L2 (V).
VL3: Phase-Neutral Voltage L3 (V).
a1 A2 a3
62.82 62.99 63.05
A1: Current L1 (A).
A2: Current L2 (A).
A3: Current L3 (A).
W1 W2 W3
18868 18893 18912
W1: Active power L1 (W).
W2: Active power L2 (W).
W3: Active power L3 (W).
va1 va2 va3
-25 -81 -207
VAr1: Reactive power L1 (Var).
VAr2: Reactive power L2 (Var).
VAr3: Reactive power L3 (Var).
COs1 COS2 COS3
-0.99 -0.99 -0.99
COS 1: Cos φL1
COS 2: Cos φ L2
COS 3: Cos φL3
COs III VAIII
-0.99 -5
COS III: Cos φ III
VArIII: Reactive power III (Var).
W III KW
56624 00000122.637
W III: Active power III (W).
kWh: Active energy III (kWh).
VA Iii AIII
0 0.00
VA III: Apparent power III (VA).
AIII: Current III (A).
DATE TIME
28/04/2014 14:08:54 Current date and time.
The active energy III value can be reset in the programming menu.
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4.7.- OUTPUT RELAYS
The unit has four relays (terminals 8, 9, 10, 11, 12, 13, 14, 15 and 16 in Figure 1) for connecting and dis-
connecting the installation's loads, to ensure that the programmed maximum power is not exceeded.
4.8.- PROGRAMMING
From the programming menu you can:
Program the current primary.
Program the maximum demand period.
Program the contracted power.
Delete the value for energy, the load disconnection times and the maximum demand maxi-
mum value.
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.
To enter the programming menu, hold the and keys for two seconds; the main program-
ming screen will be displayed.
SETUP
Press the key to enter the first programming screen.
4.8.1. CURRENT PRIMARY
Set P. A
063
In this step the current primary value is pro-
grammed.
Press the button to increase the digit that is
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.
Maximum value: 950 A.
Minimum value: 1 A.
Press the key to access the next programming step.
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4.8.2. SELECTING THE MAXIMUM DEMAND VARIABLE
SET PD V
P (W)
In this step the variable for calculation the maximum
demand is programmed.
Press the button to select between the possible
options:
W: Active power.
VA: Apparent power.
mA: Current III
Press the key to access the next programming step.
4.8.3. PERIOD OF MAXIMUM DEMAND INTEGRATION
Set PD 
015
In this step the maximum demand integration period
is programmed.
Press the button to increase the digit that is
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.
Maximum value: 60 minutes.
Minimum value: 1 minute.
Press the key to access the next programming step.
4.8.4. CONTRACTED POWER
Set  (W/v/m
)
_05000
In this step the contracted power for the installation
is programmed.
Press the button to increase the digit that is
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.
Maximum value: 500,000 (W/VA/mA)
Minimum value: 0 (W/VA/mA)
Press key to access the next programming step.
4.8.5. DELETING THE MAXIMUM DEMAND MAXIMUM VALUE.
Clea PD mAX
NO
In this step you select whether or not to delete the
maximum demand maximum value.
Press the button to select between the two pos-
sible options: No or Yes.
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Press key to access the next programming step.
4.8.6. DELETING THE ENERGY VALUE
Clea Energy
NO
In this step you select whether or not to delete the
energy value.
Press the button to select between the two pos-
sible options: No or Yes.
Press key to access the next programming step.
4.8.7. DELETING THE OUTPUT RELAY DISCONNECTION TIMES.
Clea
out % Time
NO
In this step you select whether or not to delete the
% of time that each output relay has been discon-
nected.
Press the button to select between the two pos-
sible options: No or Yes.
Press key to access the next programming step.
4.8.8. LEVEL OF OUTPUT RELAY NO. 1
out1 Level (%)
75
In this step you program the value (%) of contracted
power from which the output relay is disconnected.
Example: If OUT1 is programmed to 75%, when the maximum demand value reaches 75% of the
contracted power in the installation, output relay no.1 will be disconnected, thus disconnecting all the
corresponding loads.
Press the key to increase the digit that is 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.
Maximum value: 99%.
Minimum value: 0 %.
Default: OUT1 : 75% , OUT2 : 80%, OUT3 : 90%, OUT4 : 95%
Press key to access the next programming step.
4.8.9. HYSTERESIS OF OUTPUT RELAY NO. 1
out1 Hyst (%)
05
The hysteresis value, i.e., difference between the
relay connection and disconnection point, in %, is
programmed in this step.
Press the button to increase the digit that is
currently flashing.
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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.
4.8.10. DELAY IN CONNECTING OUTPUT RELAY NO. 1
out1 Delay ON (s)
05
In this step the delay in connecting the output relay
is programmed.
Press the button to increase the digit that is
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.
Maximum value: 99 seconds.
Minimum value: 0 seconds.
Press key to access the next programming step.
4.8.11. DELAY IN DISCONNECTING OUTPUT RELAY NO. 1
out1 Delay OFF (s
)
05
In this step the delay in disconnecting the output
relay is programmed.
Press the button to increase the digit that is
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.
Maximum value: 99 seconds.
Minimum value: 0 seconds.
Press key to access the next programming step.
4.8.12. STATUS OF THE CONTACTS FOR OUTPUT RELAY NO. 1
out1 Contact
N.C.
In this step the status of the output relay contact is
selected.
Press the button to select between the two pos-
sible options:
N.C. normally closed.
N.O. normally open.
Press key to access the next programming step.
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