COMEM DTI User manual

Temperature monitoring unit
DTI and eDTI
Instruction manual
TRANSFORMER COMPONENTS

TEMPERATURE MONITORING UNIT DTI AND EDTI
2
Content index
Safety .................................................4
DTI and eDTI .......................................5
Electrical diagram...............................7
Front panel description.......................8
Programming of the device ................9
Modality of tripping and restore .......15
Diagnostic ........................................16
Visualization of the maximum
measured temperature .....................17
Visualization of the channels with
the higher temperature.....................17
Test of the light signaling .................17
Exclusion of the input probes
not used............................................17
Technical features............................18
Movement, transport and storage ....18
Appendix A: MODBUS address.........19
Dimensions.......................................20

3
Safety
Safety instructions
Make sure that any person installing, taking into operation and operating the
“temperature monitoring unit DTI/eDTI”:
• is technically qualied and competent.
• fully comply with these assembling instructions.
Improper operations or misuse could cause danger to:
• life and limb
• to the equipment and other assets of the operator
• to the equipment proper function
Opening of the device will void your warranty.
Safety instructions in this manual are shown in three different forms to emphasi-
ze important information.
This information indicates particular
danger to life and health. Disregarding such
a warning can lead to serious or fatal injury.
This information indicates particular
danger to equipment or other property of
the user. Serious or fatal injury cannot be
excluded.
The temperature control unit DTI/eDTI
must not be installed near sources of
electromagnetic interference.
Installation, electrical connection and
fitting the device may only be carried out by
qualified personnel and only in accordance
to this instruction manual.
It is responsibility of the user to make
sure that the device is used for specified
application only.
For safety matters, please avoid any
unauthorized and improperly works.
All relevant fire protection regulation must
be strictly observed.
These notes give important or specific
information concerning the equipment or
as to work with the equipment.
WARNING CAUTION
CAUTION
CAUTION
WARNING
NOTE

TEMPERATURE MONITORING UNIT DTI AND EDTI
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DTI and eDTI
Product description
The Temperature monitoring device DTI/eDTI is used in resin or dry type transfor-
mers and can also be easily adapted for use in oil transformers.
The DTI/eDTI uses PT100 temperature probes for a constant monitoring of tran-
sformer temperatures. The device generates two intervention levels of electric
signals (alarm and trip).
Safety notes on the equipment operation
The electrical installation must conform to the national safety regulations.
The Temperature monitoring device DTI/eDTI has double insulation. Earthing is
not required.
The DTI family are devices which use PT100 temperature probes for constant
monitoring of transformer temperatures in 4 points: three on the transformer
winding columns and one on the machine’s magnetic circuit.
If the transformer malfunctions, causing its temperature to rise, DTI unit genera-
tes an alarm signal. If the temperature reaches danger levels the unit generates a
second intervention level. Moreover, a switch can manage the fan.
Installation
The device must be installed and used by personal opportunely learned.
Before to proceed at the installation it’s necessary to verify if the device is intact
and it hasn’t damages due to transportation or handling. The power supply must
be compatible with the device range. The instrument installation must be done in
total absence of voltage and observing the security norm in force.
All operation of maintenance and reparation executed by not authorized persons
are forbidden.
If during the functioning the device becomes unsafe, it’s necessary to put it out of
action and to be sure that this device won’t be used unintentionally.
The use shall be considered unsafe when the instrument:
• doesn’t work regularly
• has damage clearly visible
• has damage caused of transport or handling
• is stored in bad condition
The wires must be fixed properly
CAUTION

5
DTI and eDTI
Connection of the temperature sensors
For the connection of the sensor RTD PT100 it’s necessary to follow the indica-
tion of the wiring diagram of this manual: pay attention to not invert the position
between the conductors with red insulator and the conductor with white insulator.
The probes type PT100 with three wires use the third wire to compensate the
resistance of the conductors (max 20 Ω).
If the sensor has two wires (normally white and red) it’s necessary to short-circuit
the terminals with the red wire (1-2, 4-5, 7-8, 10-11).
To reduce the external noises, it’s necessary to use the following indication for
the wires:
• use probes with shielded wire connected at earth and wires twisted
• separate the wires of the probes from wires of power supply
• use wires with section at least of 0,5 mm2
• use wires with conductor with tin or silver-plated
Output relays
For the connection of the output contacts it’s necessary to follow the indication
in the diagram.
The ALARM and TRIP relays commute when the threshold set value gets over.
The FAULT relay is normally energized, and it commutes in presence of a PT100
anomaly or of the device.
During the normal functioning of the device the contact 38-39 is open, while the
39-40 is closed.
The FAN relay is used to control the cooler fan, according to the on/off thresholds
set.

TEMPERATURE MONITORING UNIT DTI AND EDTI
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Electrical diagram
View rear panel of the instrument with terminals for the connections

7
°C
T3 T4
123 4
FAULT
HOLD
FAN
SET
ALARM
TRIP
T1 T2
HOT
T.
MAX ENTER
RESET
°C
eDTI
Modbus RTU / 4-20mA
°C
T3 T4
123 4
FAULT
HOLD
FAN
SET
ALARM
TRIP
T1 T2
HOT
T.
MAX ENTER
RESET
°C
DTI
°C
T3 T4
123 4
FAULT
HOLD
FAN
SET
ALARM
TRIP
T1 T2
HOT
T.
MAX ENTER
RESET
°C
DTI
033048
°C
T3 T4
123 4
FAULT
HOLD
FAN
SET
ALARM
TRIP
T1 T2
HOT
T.
MAX ENTER
RESET
°C
eDTI
Modbus RTU / 4-20mA
033048
Front panel description
1
2
3
4
8
9 10 10
11
7
6
5
Legend:
1. LEDs T1-T2-T3-T4 for the on-measuring channel displayed
2. T1-T2 and T3-T4 displays for the channel temperature visualization and
settings
3. LEDs ALARM for the Alarm status in the related channels (1 to 4)
4. LEDs TRIP for the Trip status in the related channels (1 to 4)
5. LED FAULT: failure indication (device or PT100 probes)
6. LED HOLD: the manual reset is active
7. LED FAN: the ventilation output is active
8. Push - button HOT / T. MAX to display the measured channel with higher
temperature (LED indication activated) and to display maximum
temperatures achieved
9. Push - button ENTER / RESET to conrm programming set and the manual
alarm reset intervention
10. Push - buttons →+ / ←-for selecting the displayed channel and for changing
parameter of programming
11. Push - button SET for the settings

TEMPERATURE MONITORING UNIT DTI AND EDTI
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Programming of the device
When the device is switched on, on the display will ash the index of the internal
software: later the device starts to display the temperature read on the measured
input.
To enter in the programming mode, press the button SET for some second up to
light the relative SET LED.
The settings appear in the sequence showed after. To go out of the programming
mode without changing the preset values, it’s necessary to press SET without
conrming with the ENTER key the modied data.
To modify the values or the status, it’s necessary to use →and ←keys and the
ENTER key to store the modication.
The pressure of the ENTER key move automatically the programming at the
successive function or value.
Selection of the HOLD function
This is the rst function in the set menu. In this programming phase the HOLD
LED switches on.
The Hold function allows to store the alarm condition that can be rearmed only
manually with the RESET button when the temperature is lower than the threshold
set.
If this function is disabled it’s possible to rearm the ALARM with the RESET
button even if the temperature is higher than the threshold set, while the value of
temperature come back under the threshold set the alarm will be automatically
deleted.
To set the Hold function it’s necessary to use the ←and →keys:
ON function enabled
OFF function disabled
Press the ENTER key to conrm the operation.
HOLD mode T1-T2 display T3-T4 display
HOLD mode deactivated HLD Off

9
Selection of the number of active inputs
It is possible to select the number of activated inputs. It’s possible to choose
between 3 and 4 inputs enabled; if there are 3 inputs enabled the T4 display
remain off.
Select 3 or 4 inputs with ←and → keys.
Conrm with ENTER.
Control ventilation
The FAN led will switch on indicating the programming of the ventilation control.
If 3 inputs are selected the following setting are available:
• ventilation control inhibited
• fan control active on 3 inputs
Select the conguration with ←and → keys.
Conrm with ENTER.
If 4 inputs are selected the following setting are available:
• ventilation control inhibited
• fan control active on 3 inputs
• control active only on fourth input
Select the conguration with ←and → keys.
Conrm with ENTER.
Programming of the device
Active inputs mode T1-T2 display T3-T4 display
HOLD mode deactivated Ch 123
All inputs activated Ch ALL
Fan mode (3 inputs) T1-T2 display T3-T4 display
Fan control inhibited FAN Off
Fan control on 3 inputs FAN ON
Fan mode (3 inputs) T1-T2 display T3-T4 display
Fan control inhibited FAN Off
Fan control on 3 inputs FAN ON
Fan control on 4 inputs FAN 4

TEMPERATURE MONITORING UNIT DTI AND EDTI
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Programming of the device
Selection of the threshold of switch-on and switch-off ventilation
It is possible to program the threshold for enabling and disabling the ventilation.
• Selection the threshold for disabling ventilation
The FAN LED is on, with xed light indicates this phase of programming.
With ←and → keys select the value of temperature indicated on display.
Interval of programming: from -25°C up to (enabling threshold -1°C)
Conrm with ENTER.
• Selection the threshold for enabling ventilation
The FAN LED is on, with ashing light indicates this phase of programming.
With ←and → keys select the value of temperature indicated on display.
Interval of programming: from (disabling threshold +1°C) up to 200°C
Conrm with ENTER.
Selection of the alarm and trip threshold
The FAN This setting starts to program from the channel number 1.
The ALARM LED ON indicates the programming of the alarm:
With ←and →keys select the value of temperature
Interval of programming: from -25°C up to (trip threshold -1°C)
Conrm with ENTER.
The TRIP LED ON indicates the programming phase of the tripping threshold.
With ←and →keys select the value of temperature
Interval of programming: from (alarm threshold +1°C) up to 200°C.
Conrm with ENTER.
Repeat the same operation for the successive channels.
Selection of address network identication for the communication of the serial
port (MODBUS-RTU protocol)
This setting is indicated on displays with:
• value to set on T1-T2 display
• ID on T3-T4 display.
With ←and →keys select the number choice
The range for accepted value is from 1 to 247.
Conrm with ENTER.
This setting is significant only for eDTI model.
NOTE
Modbus setting T1-T2 display T3-T4 display
Setting address MODBUS network 001 ID