Follow the warnings described in this manual with the symbols shown below.
DANGER
Warns of a risk, which could result in personal injury or material damage.
ATTENTION
Indicates that special attention should be paid to a speci c point.
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 re.
Read the manual carefully prior to connecting the unit. Follow all installation and maintenance
instructions 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 noti cation.
DISCLAIMER
CIRCUTOR, SA reserves the right to make modi cations to the device or the unit speci ca-
tions 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
speci cations and the most updated manuals.
www.circutor.com
CIRCUTOR, recommends using the original cables and accessories that are
supplied with the device.
3�3�1� MODEL CEM-C31-T1 �������������������������������������������������������������������������������������������������������������������������8
3�3�2� MODEL CEM-C31-485-T1 ������������������������������������������������������������������������������������������������������������������ 9
6�1�1� VOLTAGE PRIMARY TRANSFORMATION RATIO ������������������������������������������������������������������������� 29
6�1�2� VOLTAGE SECONDARY TRANSFORMATION RATIO ������������������������������������������������������������������� 30
6�1�3� CURRENT PRIMARY TRANSFORMATION RATIO ������������������������������������������������������������������������30
6�1�4� CURRENT SECONDARY TRANSFORMATION RATIO ������������������������������������������������������������������ 31
6�1�5� EXITING THE SETUP MENU �����������������������������������������������������������������������������������������������������������31
6�2�-GENERAL CONFIGURATION MENU ����������������������������������������������������������������������������������������������������� 32
8�- TECHNICAL FEATURES �������������������������������������������������������������������������������������������������������������������������������� 48
9�- MAINTENANCE AND TECHNICAL SERVICE ������������������������������������������������������������������������������������������������ 51
10�- GUARANTEE �������������������������������������������������������������������������������������������������������������������������������������������������51
11�- CE CERTIFICATE ������������������������������������������������������������������������������������������������������������������������������������������ 52
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. Follow local regulations on electronic equipment recycling.
DC current
~
AC current
Note: The images of the devices are solely for the purpose of illustration and may differ from
the original device.
Instruction Manual
5
1�- VERIFICATION UPON RECEPTION
Check the following points upon receiving the device:
a) The device meets the specications described in your order.
b) The device has not suffered any damage during transport.
c) Perform an external visual inspection of the device prior to switching it on.
d) Check that it has been delivered with the following:
- An installation guide.
- Safety label (terminal cover).
If any problem is noticed upon reception, immediately contact the transport
company and/or CIRCUTOR's after-sales service.
2�- PRODUCT DESCRIPTION
CEM-C31
The CEM-C31 static three-phase energy meter measures class B active energy (EN50470) /
class 1(IEC 62053-21) and (optional) class 2 reactive energy (IEC 62053-23).
The current is measured with the transformer.
The device features:
- 2 buttons that allow you to browse the different screens and program the device.
- 2 Verication LEDs.
- LCD display, displays all parameters,
- 2 connection seals,
- 2 terminal covers, to cover the top of the terminal box and the xing screws.
- RS-485 communications (CEM-C31-485-xx models).
- Optical communications port for communications with other modules installed on a
DIN rail with a service port (CEM-C31-T1 model).
- Impulse output (models CEM-C31-T1 and CEM-C31-485-T1).
- Digital input (model CEM-C31-485-DS).
6
Instruction Manual
CEM-C31
3�- DEVICE INSTALLATION
3.1.- PRELIMINARY RECOMMENDATIONS
In order to use the device 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 CEM-C31 device must be installed by authorised and qualied staff.
The power supply plug must be disconnected and measuring systems switched off before
handling, altering the connections or replacing the device. It is dangerous to handle the device
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 device 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 device, do not use the device to take any measurements.
Inspect the work area before taking any measurements. Do not take measurements in dangerous areas or where there is a risk of explosion.
Disconnect the device from the power supply (device and measuring system
power supply) before maintaining, repairing or handling the device's connections.
Please contact the after-sales service if you suspect that there is an operational fault in the device.
Instruction Manual
7
CEM-C31
3.2.- INSTALLATION
On the side of the device are all of the indications adjusted to the CEI 62052-11 standard.
The device is installed on a DIN rail. All electrical con nections must be covered by the plastic
covers, and only the display and keypad should remain exposed.
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
3�3�1� MODEL CEM-C31-T1
Table 3:List of CEM-C31-T1 terminals�
Device terminals
1 : S1, Current input L18 : L3, Voltage input L3
2 : L1, Voltage input L19 : S2, Current output L3
3 : S2, Current output L111 : N, Neutral connection
4 : S1, Current input L213 : Auxiliary Power Supply
5 : L2, Voltage input L214 : Auxiliary Power Supply
6 : S2, Current output L221 : Impulse output (Collector)
7 : S1, Current input L322 : Impulse output (Emitter)
Figure 1:Terminals of the CEM-C31-T1�
8
Instruction Manual
CEM-C31
3�3�2� MODEL CEM-C31-485-T1
Table 4:List of CEM-C31-485-T1 terminals�
1 : S1, Current input L19 : S2, Current output L3
2 : L1, Voltage input L111 : N, Neutral connection
3 : S2, Current output L113 : Auxiliary Power Supply
4 : S1, Current input L214 : Auxiliary Power Supply
5 : L2, Voltage input L221 : Impulse output (Collector)
6 : S2, Current output L222 : Impulse output (Emitter)
7 : S1, Current input L323: B(-), RS-485
8 : L3, Voltage input L324: A(+), RS-485
Device terminals
Figure 2:Terminals of the CEM-C31-485-T1 and CEM-C31-485-DS�
3�3�3� MODEL CEM-C31-485-DS
Table 5:List of CEM-C31-485-DS terminals�
1 : S1, Current input L19 : S2, Current output L3
2 : L1, Voltage input L111 : N, Neutral connection
3 : S2, Current output L113 : Auxiliary Power Supply
4 : S1, Current input L214 : Auxiliary Power Supply
5 : L2, Voltage input L221: Digital input
6 : S2, Current output L222: Digital input (common)
7 : S1, Current input L323: B(-), RS-485
8 : L3, Voltage input L324: A(+), RS-485
Device terminals
Instruction Manual
9
3.4.- CONNECTION DIAGRAM
CEM-C31
Power
Supply
LOAD
S2S1
P1
P2
P1
S2S1
P2
S2S1
P2
P1
Figure 3: Connection diagram, CEM-C31�
L1
L2
L3
N
10
Instruction Manual
CEM-C31
3.5.- CONNECTIONS
The CEM-C31 has terminal covers to cover the top of the terminal box and the xing screws
(Figure 4).
Figure 4: Terminal covers of the CEM-C31�
The xing screws are of the mixed type, allowing the use of PZ2 and at head screwdrivers.
Maximum cable cross-section16 mm2 ( 10 mm2 with end sleeve ) ≤ 1.2 Nm
Screwdrivers headPZ2
Impulse output terminals / Digital input (21, 22), Power supply (13, 14) and RS-485 (23, 24)
Maximum cable cross-section1.5 mm2 ( 1.5 mm2 with end sleeve ) ≤ 0.6 Nm
Screwdrivers headat head (3 x 0.5 mm)
Once connected, the device can be protected with two connection seals (Figure 5).
Instruction Manual
Figure 5: Seal of the CEM-C31�
11
CEM-C31
Once the device is powered, attach the safety label (Figure 6) to terminals 13
and 14 to seal the device.
13 14
13 14
Figure 6: Attaching the safety label�
12
Instruction Manual
CEM-C31
4�- OPERATION
The CEM-C31 is an energy meter capable of measuring:
Imported and exported active energy and reactive energy in the four quadrants.
(according to version).
Active, reactive and apparent power (according to version). RMS voltage and current. Power factor, PF
4.1.- BUTTON FUNCTIONS
The CEM-C31 has 2 buttons that allow you to browse the different screens and program the
device.
The button can be sealed to prevent access to the programming of the most relevant parameters.
To seal the button, insert the seal through the slot found under the button, Figure 7.
Figure 7: Sealing the button�
Button functions on the measuring screens (Table 7):
Table 7: Button functions on measuring screens�
ButtonShort pressLong press (> 2 s)
For the cyclic movement.
Next screen.
Enters reading mode.
Instruction Manual
Enter the programming menu-
13
CEM-C31
4.2.- DISPLAY
The device has an LCD where all parameters are displayed. The display is divided into three
areas (Figure 8):
COM MAX DEM
HOURS kgC0
2 COST PAR
T1 T2
Data line
Indicator
kWh
kVArh
Figure 8: CEM-C31 Display areas
Dataline, displaying the values measured by the device.
Units, where the unit of the magnitude being viewed is shown.
Indicators, which shows other parameters:
COM, indicates that there is a communications module connected. It ashes when the
communications are established.
HOURS, displays the time in hours.
kgCO2, displays the quantity of kgCO2 released into the atmosphere according to the
energy consumed.
%
L
PF
C
Units
COST, indicates that the variable displayed in the data line is a cost.
PAR, indicates that the variable displayed in the data line is a partial meter.
T1 and T2, indicate the tariff corresponding to the on-screen information.
L1 - L2 - L3 - Indicates the presence of voltage in each phase, with its corresponding
current direction:
“ - “ is used to show the power yielded to the network.
“ “ is used to show the power absorbed by the network.
Indicates that the energy being viewed is generated.
Indicates that the energy being viewed is consumed.
Indicates that the energy is inductive.
Indicates that the energy is capacitive.
14
Instruction Manual
Reactive LED
CEM-C31
4.3.- LED INDICATORS
The device has two verication LEDs:
To verify the active energy� To verify the reactive energy (according to version).
The weight of the LEDs is 20,000 imp/kWh (kvarh).
The LEDs will remain lit when the current is lower than the energy meter start-up current. Once
the start-up current is exceeded (due to active or reactive power consumption) the LEDs are
turned off and emit impulses that are proportional to the measured energy.
Active LED
Figure 9:LED Indicators of the CEM-C31�
4.4.- IMPULSE OUTPUT (CEM-C31-T1 and CEM-C31-485-T1 models)
The energy meter has optocoupler type outputs capable of generating impulses at a previously programmed rate. (See “6.2.1. IMPULSE OUTPUT WEIGHT” and ”6.2.2. IMPULSE OUTPUT
TYPE” )
Instruction Manual
15
21
CEM-C31
4.5.- DIGITAL INPUT (CEM-C31-485-DS)
The CEM-C31-485-DS model features a impulse input (terminals 21 and 22 in Table 5), to
calculate other supplies or select tariffs.
5 V DC
COMM
470 Ω
Active Tariff selection:
21
Figure 10: Digital input, CEM-C31-485-DS�
Table 8: Tariff selection�
TariffTariff selection
Tariff 1
21
22
22
22
Tariff 2
16
Instruction Manual
CEM-C31
5�- DISPLAY
The CEM-C31 has 2 display modes:
Display in standby mode Display in reading mode
5.1.- DISPLAY IN STANDBY MODE
With the display in standby mode, all of the information is presented in cyclic form without any
need to perform any action on the CEM-C31 buttons.
This mode displays different parameters, see Table 9and Table 10, that alternate every 6
seconds.
The device is in this mode by default when none of the buttons are pressed.
Short press the button to stop the cyclic movement of the parameter being shown at the
time.
From then on, short press the button to browse all the parameters dened in Table 9 and