TECSYSTEM T154 Series User manual

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T-154
0-240°C
INSTRUCTION MANUAL
TECSYSTEM S.r.l.
Via Cristoforo Colombo, 5
20094 Corsico (MI) Italy
Tel. +39 - 02 – 4581861
Fax: +39 - 02 – 48600783
T-154 0-240°C protection relays
TECSYSTEM S.r.l ®
R.1 15/01/02

2T-154 0-240°C protection relays
TECSYSTEM S.r.l ®
T-154
T-154
PT-73
BT MT
220VAC-24VAC
FIG.2
1 2 3 4 5 6 7 8 9 10 11
possible configuration of ALARM and FAULT re-
lays parallel connection
Fig.3

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T-154 0-240°C protection relays
TECSYSTEM S.r.l ®
AUXILIARY POWER SUPPLY
•Rated voltage 24-240 Vac-dc
•Maximum ratings 20-270 Vac-dc
INPUTS
•3 or 4 inputs RTD Pt100 sensors-3
wires
•removable rear terminals
•input channels protected against elec-
tromagnetic noises and spikes
•sensors length cables compensation up
OUTPUTS
•2 alarm relays (ALARM-TRIP)
•1 alarm relay for fan control (FAN)
•1 alarm relay for sensor fault or working
anomaly (FAULT)
•output contacts capacity: 5A-250 Vac
res.
TEST AND PERFORMANCES
•Assembling in accordance with CE
rules
•Protection against electrical and mag-
netic noises: CEI-EN50081-2/50082-2
•Dielectric strength: 2500 Vac for 1 min.
from relays to sensors, relays to power
supply, power supply to sensors
•Accuracy: ± 1% full scale, ±1 digit
•Ambient operating temperature: -20°C
to 60°C
•Humidity: 90% non-condensing
•ABS self-extinguishing housing-NORYL
94VO
•Opt. Frontal plastic protection
•Opt. Protection treatment of electronic
part
•Frontal polycarbonate-IP65
•Burden: 3VA
•Data storage: 10 years minimum
•Digital linearity of sensors signal
•Self-diagnostic circuit
DISPLAYING AND DATA MANAGEMENT
•1 display 13 mm high with 3 digits for
displaying temperatures
•LED for displaying reference channel
•LED indicating alarm or trip channel
•LED indicating fault
•Temperature monitoring from 0-240°C
•2 alarm thresholds
•2 alarm ON-OFF thresholds for fan con-
trol
•Sensors diagnostic (Fcc-Foc-Fcd)
•Entering the programming by frontal
push button
•Automatic output from programming cy-
cle after 1 minute of no operation
•wrong programming automatic display
•Programmed data call out
•Possibility of setting automatic channel
scanning, hottest channel, manual scan-
ning
•Maximum temperatures and alarms stor-
age
DIMENSIONS
•96x96 mm-DIN43700 – depth 140mm
(with rear terminals)
•panel cutout 92x92 mm
1) TECHNICAL SPECIFICATIONS

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2) MOUNTING
Make a hole with the dimensions of 92x92 mm in the panel plate.
Fasten firmly the unit by the fixing blocks included with each unit.
3) POWER SUPPLY
The T-154 unit has a universal power supply. It can be supplied with 24 to 240 Vac or dc
without respect to polarities.
The ground cable must be fixed to terminal # 41.
ATTENTION: the unit may be damaged by overvoltage when power is supplied directly
from the secondary of the transformer it is monitoring. This may occur when the 220V is
obtained directly from the secondary winding and there are fixed capacitors online.
4) ALARMS AND FAN CONTROL ELECTRICAL CONNECTIONS
Take the removable terminal board off the unit before wiring.
ALARM and TRIP relays energize only when the prefixed temperature limits are reached
(NO Fail Safe) or reset when the prefixed temperature limits are reached (Fail Safe).
The FAULT relay always energizes when the apparatus is powered and it resets when the
Pt100’s are damaged or when there is no power voltage.
The FAN relay can be used for fan control or else it can be included in the conditioning cir-
cuit of the transformer box.
5) THERMOMETRIC SENSORS CONNECTION
Each Pt100 sensor has three conductors : one white and two red (CEI 75.8)
Fig.1 shows the disposition in the terminal board of the connection cables to the unit.
Channel 2 must be always referred to the central column of the transformer.
Channel 4 must be always referred to the core of the transformer or else to the ambient
Pt100 sensor, if you want to monitor the temperature of the transformer box through the
T-154 unit.
In order to protect the electronic apparatus, we suggest the application of the electronic
dischargers of the series PT-73 mono or double phase.
Alternatively, we suggest the application of a 24 Vac or better 24 Vdc power supply.

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TECSYSTEM S.r.l ®
6) MEASURE SIGNALS TRANSPORT
All transport cables of the Pt100 measure signals must absolutely:
•be divided from the power ones
•be realized with shielded cable with twisted conductors
•have a section of min 0.5 mm²
•be twisted if you have no shield
•be firmly fixed in the terminal board
•have tinned or silvered conductors
All units of the “T” series have the sensors linearization with a max error of 1% v.f.s..
7) THERMOMETRIC SENSORS DIAGNOSTIC
In the event one of the thermometric sensors installed on the machine to protect is dam-
aged, the FAULT relay energizes immediately, the ALARM and TRIP LED of the damaged
channel (Chn) lighten and the FAULT LED is lightening.
The screen will automatically display a message showing the fault condition:
•Fcc sensor is short circuited
•Foc sensor is open
During the unit normal operation, if the Fcd/YES function has been selected the display will
show Fcd indicating that a sensor is damaged and the LED corresponding to the affected
channel will lighten (Chn).
The FAULT relay energizes giving a signal to the operator.
After the replacement of the damaged sensor, you can RESET the alarm pushing RESET
until the display shows the message RST.
8) TEMPERATURES DIAGNOSTIC
When one of the thermometric sensors surveys a temperature exceeding by 1°C the alarm
limit, after 4 seconds the ALARM relay will energize and the ALARM LED of the affected
channel (Chn) will switch on.
The same occurs when the TRIP temperature limit is detected: the TRIP relay energizes
and the TRIP LED corresponding to the affected channel is lightening.
When the surveyed temperature declines of 1°C below the prefixed limit for the ALARM
and TRIP switching, the relays de-energize and the respective LED’s switch off.
TECSYSTEM has realised a special cable for the measure signal transport with all
the protection requirements in accordance with CEI Norms: mod. CT-ES

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TECSYSTEM S.r.l ®
9) COOLING-FAN CONTROL
The T-154 unit, if suitably programmed, can control the ON-OFF of the transformer fans
according to the set temperature values.
The fans of the machine can be controlled in two different ways:
•using the temperatures surveyed by the sensors on the three columns
Channel 1.2.3
ALARM and TRIP LED CH 1.2.3 illuminated
(e.g. ON at 80°C - OFF at 70°C)
•by an additional sensor (CH4/YES) for the ambient temperature inside the transformer
box.
Channel 4
ALARM e TRIP LED Ch4 illuminated
(e.g. ON at 40°C - OFF at 30°C)
Press UP or DOWN key to select this function.
10) FAN TEST
By programming (hxx) you can establish to have the fans set for 5 minutes every “xx”
hours, independently on columns or ambient temperature values.
This function has the purpose to verify periodically the fans working, when they are not in
use.
By setting h00 this functions is disabled.
11) DISPLAY MODE
By pressing DISPLAY MODE you can select one of the three display modes:
•AUTO : the display shows automatically the temperature of the hottest channel
•MAN : each channel may be viewed manually by pressing the UP or DOWN key
•T.MAX : the unit shows the max. temperature recorded by the sensors and any alarms
recorded after the last reset.
12) WORKING PROGRAM CONTROL
To review the entered values momentarily press PRG key and continue to do so advanc-
ing to each programmed value. Press ENT to return to normal operating mode.

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13) LAMP TEST
It is advisable to carry out this test on a regular basis to ensure all lamps are functioning
normally. Pressing the TEST key at any time allows the user to test all lamps
14) ALARM RELAYS TEST
All relays may be tested using the following procedure.
Press and hold the TEST key for 5 seconds. Initially all LED’s illuminate, changing to the
main screen display flashing TST.
Release the test key when the yellow relay test LED illuminates.
The screen display will show the relay selected for testing and the respective LED will be
illuminated.
The relays to test will be indicated on the display by:
•“Fan” :cooling relay
•“Flt” :Pt100 fault relay
•“Alr” :alarm relay
•“trP” :trip relay
Use the Scroll UP or DOWN keys to make the selection. Press the SET key to perform the
test on the selected relay. To reset press the RESET key.
To discontinue operation and revert to normal operation, press the TEST key.
At the start of the test, a timer is automatically initiated which reverts the unit to normal op-
eration if no inputs are detected for a period of five minutes.
15) ALARM RELAY EXCLUSION
The alarm relay will change contact state when the alarm set point temperature value is
reached. An illuminated alarm LED provides indication of the affected channel. To reset
the relay contact, press the RESET key. The alarm LED corresponding to the affected
channel will start flashing to indicate that an alarm temperature value has been reached. If
the set point alarm value is exceeded up to a value of 5 °C below the set trip threshold, the
alarm relay will change contact state again and the alarm LED will illuminate. Once again
press the RESET key to reset the relay contact. When the trip set point temperature value
is reached, the trip relay will change contact state and both the yellow alarm and the red
trip LED’s illuminate.
16) IMPORTANT NOTICE
Before conducting the insulation test, disconnect the power supply to the unit to
avoid damage.
If any lamp is not functioning the unit must be returned for repair.

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TECSYSTEM S.r.l ®
17) PROGRAMMING
N° KEY DISPLAY NOTES
1PRG/SET To begin programming press and hold PRG/SET.
PRG will flash for 7 sec. When PRG stops flash-
ing, default alarm setpoint will appear on display. Program LED will light
2Enter the desired Limit setpoint for Ch 1-2-3
3PRG/SET TRIP set T° appears
4Enter the desired Trip setpoint for Ch 1-2-3
5 PRG/SET CH4 appears on the display
6 Enter CH4 YES or NO YES: Ch4 enabled
NO: CH4 disabled
7 PRG/SET ALARM set T° appears only if YES was chosen at step 6.
8 Enter the desired Trip setpoint for Ch 4
9 PRG/SET TRIP set T° appears only if YES was chosen at step 6.
10 Enter the desired Trip setpoint for Ch 4
11 PRG/SET “FAN” appears on display
12 Enter FAN YES or NO YES: FAN contacts enabled
NO: FAN contacts disabled
13 PRG/SET Status of FAN control will appear
on the display as CHF only if YES was chosen at steps 6 and 12.
14 set up CH 1,2,3, or CH4 respective LED alight
15 PRG/SET ON appears on display
16 PRG/SET The ON T° appears
17 Enter desired setpoint for fan to turn off only if YES was chosen at step 12.
18 PRG/SET OFF appears on display
19 PRG/SET The OFF T° appears
20 Enter the desired temperature for fan to turn on only if YES was chosen at step 12.
21 PRG/SET Status of FAN control TEST will appear
on the display as h00
22 set up the number of hours only if at step 12 you chose YES
h00 = function disabled
23 PRG/SET Fcd appears on display
24 Enter Fcd YES or NO Fcd YES = unit will indicate dam-
aged sensor.
Fcd NO = indicator off.
25 PRG/SET PRG appears on display
26 set up Prg YES or no Prg NO = program cannot be
changed
27 ENT
Programming is completed. The unit will perform the light test.
28 PRG/SET Press ENT to return to normal operating mode.

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TECSYSTEM S.r.l ®
18) PROGRAMMING REHABILITATION IN CASE OF BLOCK (Prg no)
In the event program access is blocked the display will show SET and then display “noP”.
To gain access, press the ENT key and return to normal operation. Touch the PRG key
and then, press and hold the TEST key for approximately 7 seconds until the flashing
PRG screen display ends, and the message nCH is displayed.
NOTE: this procedure removes the lockout feature. To block access again, this feature
must be reprogrammed.
19) WARRANTY
The “T” series units are warranted for a period of 12 months from the delivery date
marked on the unit.
Warranty is limited to repair or replacement of the defective products and no contingent
liabilities will be accepted.
Warranty will be voided if the unit is found to be tampered with or when it has been dam-
aged as a result of incorrect input or power supply connections (out of the max working
limits 20+270 Vac-dc). Warranty will be voided if the unit is damaged as a result of transi-
tory overvoltages. Freight expense is not covered under warranty.
In case of dispute, the qualified FORUM is the one in Milan.
20) PT100 EXTENSION CABLE: TECHNICAL SPECIFICATIONS
Cable 20xAWG 20/19 cu/stg
Section 0.55 mm²
Antiflame Insulation PVC105
In accordance with CEI 20.35 IEC 332.1
Max. working temperature: 105°C
Conformation : 4 terns of the numbered conductors (1-1-1.........4-4-4)
RRW twisted and coloured conductors
Shield cu/stg
PVC Antiflame protecting covering
External diameter 9.0 mm
Skeins of 100 m

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TECSYSTEM S.r.l ®
TROUBLESHOOTING
PROBLEMS CAUSES / SOLUTIONS
The unit will not switch on, with control
power energized Check the terminal block for correct installa-
tion. Check for voltage at the terminal block
Channel 4 is indicating fault and display-
ing FOC (only three Pt100 sensors are
connected) Wrong programming of the unit.
Repeat programming.
One of the 3/4 channels is indicating fault
and displaying FOC/FCC Check the sensors connection.
Look for damaged sensors.
Replace damaged sensor
When switching the unit on-off, the alarm
and trip relays energize Strong electrical noise is being picked up on the power line.
Install a transient suppressor (PT-73.)
Check to ensure the shield of the sensor
cable is connected to the panel ground.
Install shielded cable (Mod. CT-ES) or twist
the sensor conductors.
All the sensors are displaying FCC. Wrong wiring connections. The terminal
block is upside-down.
The temperature indicated by one or
more channels is wrong.
The sensors are defective.
Check the sensor resistance with an Ohme-
tre.
The unit is calibrated incorrectly.
Return for repair.
With a control power source of 24 VDC
the unit switches off and will not switch
back on. Check the input voltage is between 20-24
VDC.
Reconnect to a stable source of power.
Return if unit does not respond
Sudden activation of the trip relay with
normal operating temperature.
One channel caused the occurrence.
Sensor defective (Fcd).
Replace the sensor.

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T-154 0-240°C protection relays
TECSYSTEM S.r.l ®
T-154 ELECTRICAL CONNECTION
13 14 15 16 17 18 19 20 21 22 23 24
CH 1 CH 2 CH 3 CH 4
1 2 3 4 5 6 7 8 9 10 11
Pt100 SENSORS CONNECTION
RELAYS CONNECTION
40
41
42 POWER SUPPLY
24-240 VAC-VDC
WHITE
RED
RED
Pt100
FIG.1
ALARM TRIP FAULT FAN

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TECSYSTEM S.r.l ®
T154 0-240°C TEST DESCRIPTION
Date of shipment:
N° Description
1 PC board test
2 Input test
3 Test of relay contacts and outputs
4 Key test
5 Lamp test
6 Calibration at 100 and 200°C (for temperature monitoring units)
7 Software test
8 Burn-in minimum 24h
The unit was submitted to the following tests during production: