TSX1

Thermal protection device for electric units

4 analog input channels, 4 output relays

USER’S MANUAL

TESAR srl

52030 Chiassa Superiore (AR) - Italy

Tel +39 0575 3171 fax +39 0575 317201 [email protected]

www.trafo.it

Technical specifications

Power supply

! nominal line voltage and frequency: 24 ÷ 250 Vcc and Vac at 40 ÷ 60 Hz

! Maximum line voltage from 20 to 260 Vcc and Vac

! Vcc with reversible polarity

! Maximum power absorption 7 VA

! Protection against electrical and magnetic noises

Inputs

! 4 analog input channels for three wires Pt100 probes compliance with requirement DIN 43760. The operator can de-activate the 4th channel from programming

! connection with removable terminals for wires of 1,5 mm section

! cables length compensation up to 500 m (1 mm section)

! detection for broken or not connected probes

! input channels protected against electromagnetic noises and spikes

Outputs

! 4 output relays with contacts capacity of 5A with 250Vac

one relay for the 1st setpoint level (for fan control)

one ralay for the 2nd setpoint level (pre-alarm)

one relay for the 3rd setpoint level (unhook of the electrical unit)

one relay for probe fault or working anomaly signaling (general alarm)

! output connection with removable terminals for wire of 1,5 mm section and capacity of 8A/250 Vac

Device dimensions

! frontal dimension 96 mm x 96 mm compliance with DIN 43700 requirements.

Device length of 105 mm with rear terminals

! assembling on the front of the electric panel

! panel cut-out 92 mm x 92 mm

! ABS self-extinguishing container

! Frontal panel in anti-scratch polyestere with keyboard and signal leds

Performances

! Temperature monitoring from 20°C to 200°C

! Temperature measurements accuracy ±0,5% full scale, ±1 digit

! Digital linearity of probe signal compliance with DIN 43760 requirements

! Self-diagnostics

! Operating temperature range from 5°C to 50°C

! Humidity lower then 95% no-condensing

! Compliance with CE requirement

! User data storage for 10 years without power supply

! Device functionality self-diagnostic

! Alarm signal for working anomalies or wrong user data definition

Device and accessories description

The Figure represents the scheme of the device.

Frontal panel

1.

Backlighted LCD display 16 characters per 2 lines. It allows the simultaneous visualization of the measured temperatures. It is possible to visualize and modify the alarm sets using the keys.

2.

Leds A1, A2, A3 point out the corresponding alarm activation due to the exceeding of the alarm sets by one of the measured temperatures.

3.

General Alarm led points out anomalies. This led lights up in these cases:

-

The self-diagnostics program pointed out an anomaly

-

There is a damaged or not connected probe

-

The system is in no-active control (data programming modality)

4.

Second function v key. Pressed with the confirming key (7) it allows to enter the programming modality; in this modality it allows the shift on number to be modified.

5.

Decrease u key. Out of the programming modality it allows the navigation in the data visualization pages. In the programming modality it allows to decrease the value of the programming datum.

6.

Increase t key. Out of the programming modality it allows the navigation in the data visualization pages. In the programming modality it allows to increase the value of the programming datum.

7.

Confirming

å key. In the programming modality it confirms the set datum.

NEX

1

3

2

A1 A2 A3

4

5

6

front view

7

3

Back panel and accessories

1.

Connector for probes connection

2.

Connector for the relay outputs

3.

Power supply connector

4.

Removable terminals for the wiring harness

5.

Clips for the device clamping.

1

2

A

3

8

9

10

4

5

B

6

7

C

11

12

D

7

8

5

6

1

2

3

4

9

10

11

12

16

17

18

19

20

13

14

15

21

22

23

24

13

14

A1

15

16

17

A2

18

19

20

A3

21

22

25

23

24

26

27

25

26

27

4

5

3

1

2

Rear view and accessories

Mechanical installation

The device provides a black self-extinguishing ABS container. The device dimensions are compliance to the standard of DIN 43700: 96 mm x 96 mm section and a maximum depth of 105 mm.

The dimensions of the panel perforation are 92 mm x 92 mm. The fixing is carried out using the clamps provided with the device.

NEX

A1 A2 A3

Electrical connections

All the connections are carried out with the removable terminals provided with the device for a simplified wiring harness. For the wiring harness you can refer to the figure 5 and to the terminals numeration.

4

Power Supply

The power supply connection is performed connecting the power voltage to the terminals 25 and 27 without any respect of polarity for Vcc.

The nominal allowed voltages are in the 24 Vcc 240 Vcc range for the direct voltage, or in the 24 Vca 240 Vca range with 50 Hz frequency for the alternate voltage.

Terminal 26 has to be connected to the ground reference.

The device power supply is protected from momentary input over-voltages.

The damage due to a wrong power supply is not covered by guarantee.

The device does not provide internal fuses, so that you must provide an external adequate protection.

Relays outputs connection

Figure 5 shows the position of the relays not excited (turned off device).

The alarm relays are excited when one of the probes exceeds the set limit. The

General Alarm relay operates in intrinsic security, so that it is excited at the device switching on, and it is de-excited when conditions that compromise the device functionality take place. In this way when the device is switched off you have the noactive control signal.

Probes connection

The analog inputs are compatible with three wires Pt100 resistive probes.

For the sensors connection we suggest you the following expedients:

! use a shielded cable to connect the probe with the device and with the shield fixed to the ground reference inside the electric panel

! the connection cables r o u t e h a s t o b e separated from the

1 2 3 probe A

4 5 7 8 9 10 11 12 probe B probe C probe D

input probes Pt100

high-tension cables a n d f r o m c a b l e s driving inductive elements as remotecontrol switch

! the 3 wires of each probe will have the same length and

13 14 15 16 17 18 19 20 21 22 23 24

A1

A2

A3

output relays

General allarm section so that they have all the same line resistance. The line resistance will be red red white

probe Pt100

25 26 27

power supply

lower than 10

W

, corresponding to a wire of 500 meters

2 length and 1 mm section. It is also possible to use 2

5

! section. It is also possible to use 2 wires Pt100 probes making a link on the terminals for the line resistance measure, as shown in figure. In that case the temperature's measure will be affected by an error as large as longer is the probe connection cable.

1 2 3

3 wires probe jumper

1 2 3

2 wires probe

Instructions for use

Visualization and keyboard use

On the NEX device the measured temperatures and the set data visualization is done by the navigation on pages by keyboard. Besides this kind of visualization has a very intuitive use, it allows the simultaneous visualization of data related to the same ambit.

Navigation on pages

Navigation on visualization pages takes place using the increase and decrease keys referred to with t and u symbols.

Pages are cyclically placed: when you arrive to the last page you directly go to the first one. Referring to the scheme, with the key u you run the pages clockwise, whereas with the key t you run the pages anticlockwise.

The usually visualized page is page 1, which is the principle one. It shows the temperatures measured by the probes. The device visualizes this page at the

1

A 888° B 888°

C 888° D 888°

7

2

LIGHT ALWAYS ON?

YES/NO

MAX A 888°B 888°

C 888°D 888°

6

DEFAULT DATA ?

YES/NO

HYS 88° DEL 88s

IMP 88s AUT 0

5

set ABC A1 888°

A2 888° A3 888° set D A1 888°

A2 888° A3 888°

4

ENABLE

PROBE D ? YES/NO

4b

3

6

switching on and every time it is standing for a time greater than 30 seconds (no key pushed).

Page 2 visualizes the maximum values of temperatures measured by each probe.

Page 3 visualizes the three alarm levels setpoints programmed for probes A, B and C.

Page 4 visualizes the three alarm levels setpoints programmed for probe D. If lines appear instead of numbers, it means that the D probe has been de-activated by programming. Entering the programming modality from this page, you go to page

4b that allows the activation or de-activation of the D probe.

Page 5 visualizes the hysteresis, delay, alarm memory and impulsive release data.

Page 6 provides the loading of the data set usually fornished with the device.

In page 7 you can choose the operation of the display backlighting: always or limited-time alight.

Programming

The programmable data can be modified following a procedure, later on described, that allows to intuitively set data in little groups.

Data are visualized collected in pages as described in the previous paragraph. To modify one of these groups you must follow the next procedure:

! using t and u keys (as indicated in the previous paragraph) you can choose the visualization page containing the data to be programmed

! simultaneously pushing v and å keys you can enter the programming modality.

In the programming modality, according to the data group, either a guided page with specific questions or the same page with a flashing cursor standing on a cipher of the first datum to be modified, appears. The programming modality entry is easily recognizable, because also the General Alarm led lights up to signal that the device is no more in the active-control modality.

Once you entered the programming modality, a flashing cursor appears on one of the visualized data. Using t and u keys it is possible to increase, decrease or anyway modify. For numerical data it is possible to shift the cursor to the next cipher pushing the v key. The shift is cyclical: keeping on pushing the v key you pass through all the datum ciphers and after the last one you return to the initial one. This is usefull to correct erroneous sets. When the datum definition is completed, you must confirm it pushing the

å key and the cursor will shift on a cipher of the next datum. If you don't want to modify the datum it's sufficient to confirm it pushing the

å key.

Once you have confirmed the last programmable data of the visualized page, the device carries out a conformity test of the set data: if the test is positive, the set data are storaged and the device leaves the programming modality and returns to the usual visualization modality.

If the data test is negative an error signal appears and the device doesn't leave the programming modality showing the same page to correct data.

7

The exit from the programming modality can occur also for inactivity, if nobody pushes a key for at least 30 seconds. In that case the device ignores the data modifications eventually done and restores data set before entering the programming modality.

You have to program even not numerical data using the t and u keys and confirm them by the

å key.

A brief description of each page programming follows:

! in page 2 of in the programming modality, simultaneously pushing the v and the

å keys, you can modify the maximum temperatures reached by each acquisition channel. You can only put these data at zero. Entering the programming modality the four maximum values will be simultaneously put at zero. Anyway you won't see zeros because the device, once you have finished the zero setting, will do a comparison with the measured temperatures that will surely be greater so that the maximum values will immediately be updated.

! in page 3 of in the programming modality, simultaneously pushing the v and the

å keys, you can modify the temperature levels relative to the three A, B and

C probes alarms. The data modification modality is the general one described above. The A1 threshold is the first alarm level, the A2 threshold is the second one and the A3 one is the last level (transformer's uncoupling).

! in page 4 of in the programming modality, simultaneously pushing the v and the

å keys, you can go the 4b page that allows the D probe activation or deactivation. This probe is usually joined to the transformer's core, but sometimes it's not installed. In that case you have to de-activate the probe from programming to avoid the system's signal of an alarm for the disconnected probe. You can decide to activate or de-activate the D probe using the t and the u keys. If you activate the probe, you go to the temperature's thresholds programming page for the alarms: as for A, B and C probes the A1 threshold is the first alarm level, the A2 threshold is the second one and the A3 one is the last level (transformer's uncoupling).

! in page 5 of in the programming modality, simultaneously pushing the v and the

å keys, you can set a series of data whose meaning is specified in the

Description of programmable data paragraph.

! in page 6 of in the programming modality, simultaneously pushing the v and the

å keys, you can restore the standard data. In the programming modality it's necessary to answer 'sì' or 'no' using the t and u keys.

! in page 7 of in the programming modality, simultaneously pushing the v and the

å keys, you can choose two different options for the backlighting of the display. In the programming modality it's necessary to answer YES or NO using the t and u keys. If you answer YES the display will be always lighted. If you choose the second operation modality the backlighting will be usually turned off and will be turned on for a short time when the user pushes any key.

8

Entering the programming modality, if you simultaneously push the v and the å

keys in the page 1, you can cancel the alarms in case the alarm memory has been programmed (see the Description of programmable data paragraph).

When the programming data modality is activated the system is in no-active control modality, so that the relays are de-excited and the “No-active control/General alarm” led lights up.

Description of programmable data

The programmable data are the following ones:

! 3 temperatures setpoint for the ABC probes: the exceedings of those levels excites the alarms A1, A2 and A3. On these data a condition is present: the value of A1 has to be lower than the value of A2 and this one has to be lower than that of A3. If you don't respect this condition, the system signals an error and doesn't permit the exit from the programming modality.

! 3 temperatures setpoint for the D probe: the exceding of the set levels excites the alarms A1, A2 and A3. There is a condition on this data: the value of A1 has to be lower than that of A2, whose value has to be lower than that of A3. If you don't respect this condition, the system signals an error doesn't permit the exit from the programming modality.

! A unique hysteresis datum for all the programmable temperature thresholds. It avoids the alarms to switch on and off closely in time because of temperature oscillation around the temperature setpoint. This data appears as HYS in page 5.

! A delay datum to excite each alarm when a temperature threshold is exceeded: it represents the minimum time the temperature has to spend over the setpoint for the alarm activation. It avoids the alarms to be activated for temporary exceedings of the temperature setpoint. This data appears as DEL in page 5.

! Alarm memory for the alarms also when the temperature returns under the corresponding threshold value. You can select this option when you want to verify the alarm causes: in fact, in this case the alarm has to be de-activated by hand using the keys on the frontal panel. This data appears as AUT in page 5.

! Impulse length. It is activated only on the A3 alarm and you have to use it only if you have a throw coil isolator for the electric unit's unhooking. The relay corresponding to the A3 alarm (unhooking) will be closed for a number of seconds equal to the impulse length. If you don't want the relay to close you have to set this datum equal to zero. This data appears as IMP in page 5.

Figure in the next page shows the significance of the programmable data above described.

In the figure, on the horizontal axis is represented time and on the vertical one temperature.

The horizontal lines correspond to the programmable temperature setpoint and this datum minus the hysteresis (the dashed line). In the bottom of the figure is represented the alarm situation, which means the corresponding relay's shut down.

9

doesn't activate because temperature returns under the setpoint before the set delay you have very fast transients.

At time T the curve representing temperature exceeds again the setpoint and after

3 the set delay, at time T , the output channel is activated.

4

At time T the curve representing temperature goes under the setpoint, but the alarm

5 setpoint delay delay hysteresis

Time on off hysteresis.

alarm status

10