MDT-2000
Dok.nr: Mi-229gb / 2006-02-09
APPLICATION
MDT-2000 is a temperature controller (digital ther
mostat), which is intended for controlling stage
burners in combustion plants. The controller is also
suitable for controlling heating pumps, electric ele
ments in ventilation plants etc.
FUNCTION
MDT-2000 measures the outgoing water temperature from a heating boiler with a temperature sensor. The controller has two set limits for disconnection of power stages with associated temperature
hysteresis.
If there is no 230 VAC signal connected to terminal
3, the controller is blocked. Terminal 5 and 6 respective terminal 8 and 9 are connected to each other via
relay contacts.
If permission to operate is given, i.e. a 230 VAC sig
nal on terminal 3, and the temperature is below set
value for "Stage 1 OFF" minus the temperature hys
teresis for stage 1, the first relay switches, breaks
connection between terminal 5 and 6 and connects
terminal 4 with 5. When the temperature exceeds
"Stage 1 OFF", the first relay switches back, breaks
connection between terminal 4 and 5 and connects
terminal5with6.
During permission to operate, if the temperature
falls below value for "Stage 2 OFF" minus the tem
perature hysteresis for stage 2, the second relay
switches, breaks connection between terminal 8
and 9 and connects terminal 7 with 8. When the
temperature exceeds "Stage 2 OFF", the second re
lay switches back, breaks connection between ter
minal 7 and 8 and connects terminal 8 with 9.
MDT-2000 can also be operated manually using the
hand operation.
SELF-SUPERVISION
MDT-2000 monitors the measuring signal from the
temperature sensor to be within the measuring
range of 0...150 °C.
If the measuring signal is outside the measuring
range the operation is blocked and the display start
toflash"----",relaysswitch-overandterminal5
and 6 with terminal 8 and 9 closes.
The run-time self-supervision stops the operation
under the following circumstances:
q
No temperature sensor is connected
q
Faulty connected temperature sensor
q
Short-circuit in the temperature sensor
q
Break inside the temperature sensor
q
Malfunctioning wiring between the temperature
sensor and MDT-2000
MDT-2000 returns to normal operation as soon as
the measuring signal is within the measuring range
again.
DESIGN
MDT-2000 is equipped with three connected printed
circuit boards, I/O-board, sensor-board and display-board. The display-board consists of a 4-digit
indicator, 6 LED’s for indication and 4 keys for programming. The enclosure is of ABS plastic and provided with four threaded holes for cable fittings. For
fitting on DIN-rail a mounting kit is used. MDT-2000
can be programmed without opening the enclosure.
INSTALLATION
MDT-2000 is mounted via 4 screws, max Æ4 mm.
The location of the holes is shown back of the enclo
sure. Do not place the unit on a warm surface.
Connect power supply according to the electrical
connection. Check that the controller is marked with
the correct power supply voltage. If using cable
glands without a nut on the inside, glands with
grommet must be used to avoid damage to the
threads on the enclosure. Remember to remove the
transparent protective cover from the front panel af
ter finished installation.
INSTALLING THE TEMPERATUR SENSOR
The temperature sensor can be connected with two
or four wires. The best result is received with a
4-wire connection. A 2-wire connection is easier to
install but results in a risk for measurement error in
connections with long wires.
Ex. a 10m 2x0,25 mm
2
Cu-cable gives an error in
measurement with approximately 3,5 °C. Shielded
cable is recommended.
© AB MICATRONE 2006-02-09 [H:\ Apps \ Typeset \ Mima \ mi-229gb_060209.vp]
Temperature Controller with
comprehensive run-time self-supervision
c
a
t
ron
e
®
Operating and installation manual
PGM
ESC
Prog. mode
Stage 1
Stage 2
Blocked
Hand
°C
0083
Hand
TEMPERATURE SENSOR
The choice of sensor, measuring place and
installation are very important to achieve an accu
rate and representative temperature measurement.
The factors to consider are:
q
Good circulation.
q
Good thermal contact between sensor and me
-
dium.
q
The time constant (the response time for tem
-
perature changes) should be as short as possi
-
ble.
q
The sensor should not be exposed to heat radi
-
ation.
q
The sensor should not be exposed to vibra
-
tions.
q
The water flow should not be to high for the
sensor
Micatrone delivers the sensors MG-3000-DV-120,
MG-3000-DRT-125 and MG-3000-DRT-225 for
temperature measuring in liquid.
MG-3000-DV-120
This sensor shall be installed without a pocket, but
with a compression fitting. This means that it is possible to disconnect the sensor with water in the system. It can also be used for tubes with different kind
of lengths.
With this construction a very good thermal contact
with the media is achieved and the time constant
(the response time for temperature change) becomes short.
The sensor pipe has a small diameter why the radiation is small. The sensor application is limited due
to the water velocity, may not exceed 2 m/s, and that
the system pressure not exceeds 10 bar (1 MPa).
The sensor is also sensitive against vibrations. If
these restrictions not are applicable the use of
MG-3000-DV-120 is recommended.
MG-3000-DRT-125 / -225
These sensors are provided with pockets and are
used when MG-3000-DV-120 can't be used. The
sensors, with a pocket, has a restricted thermal
contact with the media and this gives a longer time
constant. To reduce this the sensors shall always be
installed upright so the pocket can be filled with
glycerine. With glycerine in the pocket the time con
stant will be reduced to less than half.
Installation of sensors on water pipes
In order the get a quick response, the sensor should
be placed close to the outlet from the boiler. If water
is supplied from different directions the sensor
should be placed a least 0.2 meters from the mixing
point so a blend of the water can occur.
In pipes with small diameters there is a problem with
placement of sensors. The sensors pipe or pocket
must be installed in the waterpipe with minimum
twice the lenght of the mesurement element.
For MG-3000-DV-120: 2 x 20 mm = min. 40 mm
For MG-3000-DRT-xxx: 2 x 35 mm = min. 70 mm
Following figures shows a suitable installation in
water pipes with small diameters, either in a pipe
curve or in an angle against the flow.
Notice! MG-3000-DRT-xxx must be installed from
above so the pocket can be filled with glycerine.
MG-3000-DV-120 do not require an installation from
above, due to that it does not have a pocket which
needs to be filled with glycerine.
2
© AB MICATRONE 2006-02-09 [H:\ Apps \ Typeset \ Mima \ mi-229gb_060209.vp]
figure 1
Installation of MG-3000-DRT-xxx.
figure 2
Alternative installation of MG-3000-DRT-xxx.
figure 3
Installation of MG-3000-DV-120
figure 4
Alternative installation of MG-3000-DV-120
Pipes with larger diametres (Ø 150 and bigger) the
sensors can be installed according to figure 5.
Notice! Never install a temperature sensor with only
the tip in the water or the sensor in the flange.
3
© AB MICATRONE 2006-02-09 [H:\ Apps \ Typeset \ Mima \ mi-229gb_060209.vp]
Pt-100 = 100 W at 0 °C. All values in W.
°C -9 -8 -7 -6 -5 -4 -3 -2 -1 0
-40
80,65 81,04 81,44 81,83 82,23 82,63 83,02 83,42 83,81 84,21
-30
84,61 85,00 85,40 85,79 86,19 86,59 86,98 87,38 87,77 88,17
-20
88,57 88,96 89,36 89,75 90,15 90,55 90,94 91,34 91,73 92,13
-10
92,52 92,92 93,31 93,71 94,10 94,49 94,89 95,28 95,68 96,07
0
96,46 96,86 97,25 97,64 98,04 98,43 98,82 99,21 99,61 100,00
°C +0 +1 +2 +3 +4 +5 +6 +7 +8 +9
0
100,00 100,39 100,78 101,17 101,56 101,95 102,34 102,73 103,12 103,51
10
103,90 104,29 104,68 105,07 105,46 105,85 106,24 106,63 107,02 107,40
20
107,79 108,18 108,57 108,96 109,35 109,73 110,12 110,51 110,90 111,28
30
111,67 112,06 112,45 112,83 113,22 113,61 113,99 114,38 114,77 115,15
40
115,54 115,93 116,31 116,70 117,08 117,47 117,85 118,24 118,62 119,01
50
119,40 119,78 120,16 120,55 120,93 121,32 121,70 122,09 122,47 122,86
60
123,24 123,62 124,01 123,39 124,77 125,16 125,54 125,92 126,31 126,69
70
127,07 127,45 127,84 128,22 128,60 128,98 129,37 129,75 130,13 130,51
80
130,89 131,27 131,66 132,04 132,42 132,80 133,18 133,56 133,94 134,32
90
134,70 135,08 135,46 135,84 136,22 136,60 136,98 137,36 137,74 138,12
°C +0 +1 +2 +3 +4 +5 +6 +7 +8 +9
100
138,50 138,88 139,26 139,64 140,02 140,39 140,77 141,15 141,53 141,91
110
142,29 142,66 143,04 143,42 143,80 144,17 144,55 144,93 145,31 145,68
120
146,06 146,44 146,81 147,19 147,57 147,94 148,32 148,70 149,07 149,45
130
149,82 150,20 150,57 150,95 151,33 151,70 152,08 152,45 152,83 153,20
140
153,58 153,95 154,32 154,70 155,07 155,45 155,82 156,29 156,57 156,94
150
157,31 157,69 158,06 158,43 158,81 159,18 159,55 159,93 160,30 160,67
160
161,04 161,42 161,79 162,16 162,53 162,90 163,27 163,65 164,02 164,39
170
164,76 165,13 165,50 165,87 166,24 166,61 166,98 167,35 167,72 168,09
180
168,46 168,83 169,20 169,57 169,94 170,31 170,68 171,05 171,42 171,79
190
172,16 172,53 172,90 173,26 173,63 174,00 174,37 174,74 175,10 175,47
table 1
Table for the resistance in Pt-100 temperature sensor (acc. DIN 43760)
figure 6
Incorrect installation
Incorrect !
figure 5
PROGRAMMING
Press the PGM-key for, at least, 3 seconds and the
display will change from actual value to the parame
ter list’s first parameter P00. The parameter list
comprises five parameters. It's not possible to
change the first one.
Press the
¹¸
-keys to show P00, P01, P02, P03
and P04.
By pressing the PGM-key, the set value is displayed
for the present parameter.
To change the set value, press the PGM-key once
and the left digit starts to flash. To change the digit,
use the
¹¸
-keys and press the PGM-key to store
the selected digit. Now the next digit to the right
starts to flash and can be programmed. Repeat with
the remaining digits for the entire row and press a fi
nal time on the PGM-key. The display will flash three
times with the programmed value as a receipt of ac
complished programming.
Present programming can be interrupted before the
last digit through pressing the ESC-key.
When a value has been programmed a return to the
parameter list occurs automatic.
Par.
nr:
Parameter list Range Factory
default
P00 Software version XXX
P01 Stage 1 OFF 0...150 90 °C
P02 Hysteresis stage 1 1...99 10 °C
P03 Stage 2 OFF 0...150 82 °C
P04 Hysteresis stage 2 1...99 5 °C
During programming, the LED ”Prog. mode” is lit.
Return to indication of actual value occurs by press
ing the ESC-key, at which the LED “Prog. mode” is
put out and the LED “°C” is lit. If MDT-2000 is left in
position “Prog.mode” and no keys has been
pressed during 5 minutes, MDT-2000 will auto
maticly return to showing the actual value.
RUN IN HAND OPERATION
Press both PGM- and ESC-key for, at least, 3 sec
-
onds. The LED ”Hand” is lit and the controller is dis
-
abled. By pressing
¹¸
-keys, wanted power stage
can be chosen, se table below.:
Power stage Relay 1 Relay 2
Stopped Terminal 5 and 6
connected
Terminal 8 and 9
connected
Stage 1 Terminal 4 and 5
connected
Terminal 8 and 9
connected
Stage 2 Terminal 4 and 5
connected
Terminal 7 and 8
connected
SUPERVISION DURING HAND OPERATION
If the temperature exceeds the set value in parame
-
ter P01, "Stage 1 OFF", MDT-2000 switches to
Stopped immediately. Another power stage can be
selected, by pressing the
¸
-key when the tempera
-
ture is below set value in parameter P01.
Notice! Position hand operation do not consider set
temperature hysteresis.
STOP HAND OPERATION
Hand operation can be stopped in two ways:
•
Pressing the ESC-key.
•
If no keys has been pressed during the past 30
minutes.
The LED ”Hand” is put out and the MDT-2000 reverts to normal operation.
4
© AB MICATRONE 2006-02-09 [H:\ Apps \ Typeset \ Mima \ mi-229gb_060209.vp]
100
90
99
80
82
70
77
Protection temperature limiter
P01, Stage 1 OFF
P03, Stage 2 OFF
P02, Hysteresis stage 1 (stage 1 ON)
P04, stage 2 (stage 2 ON)Hysteresis
°C
Example for 2-stage burners (factory default):
figure 7
TECHNICAL DATA
Power supply voltage:
230 VAC ±10% 50Hz
Power consumption: 7.5 VA
Ambient temperature: 0...55 °C
Indication: 4 7-segments LED's and
6 function LED’s.
Programming: 4 keys
Temperature sensor: Pt-100
Connection to the tem
-
perature sensor:
4-wire or 2-wire
Measuring range: 0..150° C (calibrated at
50 and 100 °C)
Measurement error:
± 1° C
Number of set limits: 2, one for each stage,
0..150 °C
Temperature hysteresis: 2, one for each set limit,
1..99 °C
Output relays: 2 pcs, one for each
stage.
Max. load, relays:
230 VAC 2A cosj =1
Signal for operation
conditions:
230 VAC Notice! The
same line as terminal 1
Electrical connections:
- power supply voltage:
- relays:
- sensor:
2x1,5 mm
2
/terminal
2x1,5 mm
2
/terminal
2x0,75 mm
2
/terminal
Cable lead-through: 4 threaded holes,
(2 pcs M16 + 2 pcs M20)
Degree of protection: IP65
Dimensions: [WxHxD]: 120 x 200 x 57 mm
Weight: 0,75 kg
CONNECTING SHIELDED CABLE TO SENSOR
If a shielded cable is used (recommended), the
shield should be connected to ground in MDT-2000.
This is easiest done by connecting incoming ground
wire with the shield to the terminal on the circuit
board marked with ground symbol.
This terminal is not connected anywhere else on the
circuit board or in MDT-2000. For safety reasons
the terminal is not to be used for anything else other
then to connect the ground wire to the cable shield
for the temperature sensor.
5
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Terminals
MDT-1000
Terminals
MDT-2000
C
onvertingfrom to MDT-2000MDT-1000
12
3
4
56
7
89
11 12 13 14
12
3
4
56
7
89
10 11
Stage 1
Power
supply
230 VAC
Stage 2
Neutral
Line
{
{
{
Protectional earth
for functional grounding
230 VAC
figure 8
Converting from MDT-1000 to MDT-2000
ELECTRICAL CONNECTION
6
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AB Micatrone Telephone: +46 8-470 25 00
Åldermansvägen 3 Fax: +46 8-470 25 99
SE-171 48 SOLNA Internet: www.micatrone.se
SWEDEN E-mail: info@micatrone.se
12
3
4
56
7
89
11 12 13 14 15
Stage 1
Start
In
Stop
Start
In
Stop
Terminals in burner
(EUROSTECKER)
MDT-2000
Stage 2
Operation
230 VAC
Pt-100 4-wire
Pt-100
2-wire
{
Power
supply
230 VAC
Neutral
Line
{
{
+
Relay contacts for MDT-2000 are drawn as:
No power on terminal 1
No power on terminal 3
Temperature higher than
Stage 1 OFF and Stage 2 OFF
1.
2.
3.
F
Flow
monitor
*)
°C
P
L
Protection
temperature
limiter
Protection
pressure
limiter
Protection
waterlevel
limiter
**)
L
N
T2 T1
T6
T8
T7
*) Sequence controller, for instance MVP-300 or MVP-3000
**) Limit switch at burner flange
figure 9
Electrical connection
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