ABB Comem DTI User manual

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TRANSFORMER COMPONENTS

Temperature monitoring device

Comem DTI and Comem eDTI

Instruction manual

Content

1. Safety

1.1 Safety instructions 3

1.2 Specified applications 4

1.3 Safety notes on the equipment operation 4

2. Comem DTI and eDTI 5

2.1 Operating principle 5

2.2 Installation 6

2.3 Connection of the temperature sensors 7

2.4 Output relays 7

3. Electrical diagram 8

4. Wiring connection 9

5. Front panel description 10

2TEMPERATURE MONITORING DEVICE COMEM DTI AND COMEM EDTI - INSTRUCTION MANUAL

6. Programming of the device 11

6.1 Selection of the HOLD function 11

6.2 Selection of the number of active inputs 12

6.3 Control ventilation 12

6.4 Selection of the threshold of switch on and switch off

ventilation 13

6.5 Selection of the alarm and trip threshold 13

6.6 Selection of address network identification for the

communication of the serial port (MODBUS-RTU protocol) 14

6.7 Selection of the baud rate 14

6.8 Selection data bit and stop bit 15

6.9 Selection of the linked channel with the analogue output 16

6.10 Configuration output signal 17

6.11 Configuration diagnostic probes 18

6.12 Exit from the programming phase 18

7. Modality of tripping and restore 19

7.1 Alarm 19

7.2 Trip 19

7.3 To silence alarm 19

8. Diagnostic 20

9. Visualization of the maximum measured temperature 21

10. Visualization of the channels with the higher temperature 22

11. Test of the light signaling 22

12. Exclusion of the input probes not used 22

13. Technical features 23

14. Dimensions 24

15. Movement, transport and storage 25

16. Appendix A: MODBUS address. 26

TRANSFORMER COMPONENTS

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1. Safety

1.1 Safety instructions

Make sure that any persons installing, taking into operation and

operating the “temperature monitoring device Comem DTI/eDTI”:

• Are technically qualified 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 emphasize important information.

THIS INFORMATION INDICATES PARTICU-

LAR DANGER TO LIFE AND HEALTH. DISRE-

GARDING SUCH A WARNING CAN LEAD TO

SERIOUS OR FATAL INJURY.

ALL RELEVANT FIRE PROTECTION REGULA-

TION MUST BE STRICTLY OBSERVED.

THIS INFORMATION INDICATES PARTICU-

LAR DANGER TO EQUIPMENT OR OTHER

PROPERTY OF THE USER. SERIOUS OR FA-

TAL INJURY CANNOT BE EXCLUDED.

THE TEMPERATURE CONTROL UNIT

COMEM 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 IN-

STRUCTION 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.

THESE NOTES GIVE IMPORTANT OR

SPECIFIC INFORMATION CONCERNING THE

EQUIPMENT OR AS TO WORK WITH THE

EQUIPMENT.

WARNING

CAUTION

NOTE

4TEMPERATURE MONITORING DEVICE COMEM DTI AND COMEM EDTI - INSTRUCTION MANUAL

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1. Safety

1.2 Specified applications

The Temperature monitoring device Comem DTI/eDTI is used in

resin or dry type transformers and can also be easily adapted for

use in oil transformers. The Comem DTI/eDTI uses PT100

temperature probes for a constant monitoring of transformer

temperatures. The device generates two intervention levels of

electric signals (alarm and trip).

1.3 Safety notes on the equipment operation

The electrical installation must conform to the national safety

regulations.

The Temperature monitoring device Comem DTI/eDTI has double

insulation. Earthing is not required.

THE WIRES MUST BE FIXED PROPERLY

CAUTION

TRANSFORMER COMPONENTS

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2. Comem DTI and eDTI

2.1 Operating principle

The Comem 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,

Comem DTI unit generates an alarm signal. If the temperature

reaches danger levels the unit generates a second intervention

level. Moreover, a switch can manage the fan.

Comem eDTI version has one port of serial communication RS485

which allows the connection of the measurement data, control

and programming of the device to acquisition system (PC, PLC,

SCADA, etc.). Modbus RTU is the protocol used (see specific

manual for instruction).

A Windows software is available for a management of the device

with complete function of control, storing data and recording

alarm. In addition, it is available an analogue settable output 0-20

mA or 4-20 mA with scale FROM -30°C to +200°C.

The devices type Comem DTI and Comem eDTI allow the control

and the visualization of temperature read with probe type RTD

PT100.

For each channel of measure are available two levels (alarm and

trip) that actives the commutation of the relative output relay for

signaling at distance or for disabling the machine under control.

In the front panel there are a double three-digit display that

shows the temperatures, the status of the alarm of the

measurement channels and five buttons for the programming.

The instrument can control the ventilation, storing maximum

values and trip alarms.

6TEMPERATURE MONITORING DEVICE COMEM DTI AND COMEM EDTI - INSTRUCTION MANUAL

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2. Comem DTI and eDTI

2.2 Installation

The Comem DTI family are devices which use PT100 temperature

probes for constant monitoring of transformer temperatures.

Read carefully the present manual before to install and to use the

device. 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

TRANSFORMER COMPONENTS

2.3 Connection of the temperature sensors

For the connection of the sensor RTD PT100 it’s necessary to

follow the indication 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



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

2.4 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.

8TEMPERATURE MONITORING DEVICE COMEM DTI AND COMEM EDTI - INSTRUCTION MANUAL

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3. Electrical diagram

TRANSFORMER COMPONENTS

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4. Wiring connection

View rear panel of the instrument with terminals for the connections

10 TEMPERATURE MONITORING DEVICE COMEM DTI AND COMEM EDTI - INSTRUCTION MANUAL

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5. Front panel description

910 10

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 confirm 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

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