Mkd-itf – CIRCUTOR MKD Series User Manual
Page 2
MKD-ITF
M98223701-03-10A
5.2.- Communication protocol
The
MKD-ITF
meter
uses
the
MODBUS
RTU©
communication protocol and the RS485 network protocol.
The formulated as follows:
COMMAND: NPFTAAAANNNN CRC
PN:
1 Byte
Peripheral number
FT:
1 Byte
Function 04 Reading of n Words
AAAA:
2 Byte
Address of the 1st record
NNNN:
2 Byte
Number of records to request
CRC:
1 Byte
Cyclic Redundancy Checking
In the Modbus records, the energy is accumulated in
kW·h x 100 (to 2 decimal places) with a length of 2
Words.
To read the status of the inputs, make the following Modbus
request:
Rx: NP0100140002CRC
Tx: NP0101XXCRC
XX is the response byte.
Inputs activated
Response byte (XX)
None
03
Input 1
02
Input 2
01
All
00
5.3.- Map of MODBUS RTU© memory
VALUE
REC.
Active energy +
00-01
Active energy -
02-03
Inductive reactive energy +
04-05
Capacitive reactive energy -
06-07
Inductive reactive energy -
08-09
Capacitive reactive energy +
0A-0B
Tariff 1
Active energy +
0C-0D
Active energy -
0E-0F
Inductive reactive energy +
10-11
Capacitive reactive energy -
12-13
Inductive reactive energy -
14-15
Capacitive reactive energy +
16-17
Tariff 2
Active energy +
18-19
Active energy -
1A-1B
Inductive reactive energy +
1C-1D
Capacitive reactive energy -
1E-1F
Inductive reactive energy -
20-21
Capacitive reactive energy +
22-23
Tariff 3
Active energy +
24-25
Active energy -
26-27
Inductive reactive energy +
28-29
Capacitive reactive energy -
2A-2B
Inductive reactive energy -
2C-2D
Capacitive reactive energy +
2E-2F
Partial
Partial active energy +
30-31
Partial active energy -
32-33
Partial inductive reactive energy +
34-35
Partial inductive capacitive energy -
36-37
Partial inductive reactive energy -
38-39
Partial inductive capacitive energy +
3A-3B
Inputs
Meter IN1
3C-3D
Meter IN2
3E-3F
5.4.- Description of communications
One or more MKD-ITF meters can be connected to a
computer or PLC. This system makes it possible to
centralise the data in one single record point, in addition
to the normal running of each of them.
The
MKD-ITF
has
an
RS-485
type
serial
communication output. When you connect more than
one analyser to an RS-485 communication bus, you
need to assign a peripheral address (from 01
to 255) to each of them, so that the master
(computer or PLC) can send the requests of
the different records measured or calculated
to these addresses.
The RS-485 connection is made with twisted
pair communication cable with mesh shield, a
minimum of three wires and a maximum
distance between the master and the last unit
of 1,200 metres. Up to 32 units can be
connected in this RS485 series bus.
5.5.- Connections with network converters
Description of how to connect the RS485 bus,
for
communication
through
Intelligent
Converter
(RS485-RS232)
or
through
Ethernet
Converter
(Transparent/Modbus/TCP).
MKD-ITF-RS485-
I2-C2
M33011
Intelligent
Converter
M54020
Ethernet
Converter
M54031 / M54032
TERMINALS
RS485
TERMINALS
RS485
TERMINALS
RS485/RS232
Terminal 6 A (+)
1 / A
A
Terminal 4 B (-)
2 / B
B
Terminal 5 (GND)
5 / GND
S
6.-
DISPLAY
The display of the MKD-ITF energy meter is
divided into two display areas: the first (in the
upper part) shows the value of the active
energy meters and the second (in the lower
part) shows the inductive or capacitive
reactive energy measurement. These meters
show the partial energy of each of the
energies when the code (part) appears on
the display.
7.-
DESCRIPTION OF DISPLAY ICONS
- L1-L2-L3
shows that the unit has rated voltage in each of the phases; if in one of them there is no rated voltage, the identification corresponding to
this phase disappears.
- T1 T2 T3
identification only available in the type MKD-ITF-RS485-I2-C2:; this shows the tariff selected at that exact moment, independently of the
tariff displayed in the upper part.
- The symbol
indicates that the nature of the load is inductive; the symbol
indicates that the nature of the load is capacitive.
- The symbol
indicates that the meter is in the first and fourth quadrant (consumption); the symbol
indicates that the meter is in the second
and third quadrant (generation).
8.-
TECHNICAL SPECIFICATIONS
Power circuit:
- Biphase (L1-L2):
- Frequency:
- Maximum consumption:
Voltage V
f-f
<300V
Voltage V
f-f
≥300V
- Working temperature:
- Humidity (non-condensing):
Type AC
110V – 500Vac (through the measurement
itself)
45…65 Hz
2W – 3VA
2W – 20VA
-20ºC ….+ 60ºC
5% .. 95%
Specifications of pulse outputs transistors:
- Type: Transistor opto-insulated (collector open):
- Maximum switching voltage:
- Maximum switching current:
- Maximum frequency:
- Pulse duration:
Connections
NPN
24 Vdc,
50 mA
5 pulses/second
100 ms
Terminal 1: output 1
Terminal 2: Common
Terminal 3: output 2
Inputs specifications (type of input):
Voltage-free
Metering circuit:
- Nominal voltage:
- Frequency:
- Nominal current:
- Permanent overload:
- Minimum current:
Energy meter upper limit
289Vac
f-n
/ 500Vac
f-f
45…65 Hz
40 A
120 A
160 mA
9,999,999 kWh
Mechanical characteristics:
Box material:
- Fitted unit protection (frontal):
- Non-fitted unit protection (sides and rear cover):
- Dimensions (mm) / weight (g):
- Maximum diameter of cable entrance (mm):
V0 self-extinguishing plastic
IP 51
IP 31
105x90x73 mm / 410 g
11
Class/Accuracy:
- Active energy:
- Reactive energy:
Class 1 – 62053-21
Class 2 – 62053-22
Standards: EN62052-11, EN62053-21, EN62053-23, EN61010-1
Safety:Class II / EN61010-1 Double-insulated electric shock protection class II
9.-
TECHNICAL SERVICE
If you have any doubts about the running of the unit or any faults, contact our service staff at CIRCUTOR S.A.
CIRCUTOR S.A. – AFTER-SALES SERVICE
Teléfono: +34 937452900
Vial Sant Jordi, s/n
web:
www.circutor.com
08232 - Viladecavalls (Barcelona)
e-mail: