TECSYSTEM NT935, NT538 BASIC, NT538 AD Instruction Manual
1MN0102 REV. 0
operates with ISO9001 certified quality system
R. 1.6 15/03/17
“Translations of the original instructions”
ENGLISH
NT935
INSTRUCTION MANUAL
2
NT935
PAGE
1) SAFETY REQUIREMENTS
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4
2) ACCESSORIES
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5
3) TECHNICAL SPECIFICATIONS
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6
4) FRONT PANEL
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8
DISPLAY
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9
OPERATING PROGRAM CONTROL
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—
NOTES ON SCAN AND MAN FUNCTIONS
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—
LED TEST
…………………………………..
—
ALARM RELAY TEST
…………………………………..
—
ALARM RELAY SILENCING
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5) MOUNTING
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10
6) ELECTRICAL CONNECTIONS NT935 BASIC
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11
NT935 AD BACK
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12
POWER SUPPLY
…………………………………..
13
ALARMS AND VENTILATION
…………………………………..
—
FAULT AND RESET MESSAGE SEQUENCE
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7) PROGRAMMING
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14
NT935
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—
PROGRAMMING NOTES
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16
TEMPERATURE SENSORS
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—
MEASUREMENT SIGNAL TRANSFER
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TEMPERATURE SENSOR DIAGNOSTICS
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17
VOTING FUNCTION
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PROGRAMMED DATA DIAGNOSTICS
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TEMPERATURE DIAGNOSTICS
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COOLING FAN CONTROL
…………………………………..
18
FAN TEST
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INTELLIFAN FUNCTION
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CONTENTS
First of all we wish to thank you for choosing to use a TECSYSTEM product and recommend you read this instruction
manual carefully: You will understand the use of the equipment and therefore be able to take advantage of all its
functions.
ATTENTION! THIS MANUAL IS VALID AND COMPLETE FOR THE NT935 BASIC AND NT935 AD CONTROL
UNITS
3
NT935
PAGE
8) RS485 MODBUS
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19
INTRODUCTION TO THE MODBUS INSIDE
MODULE
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OPERATING NOTES
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DATA TRANSMISSION ON MODBUS NETWORK
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RS485 ELECTRICAL CONNECTIONS
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DATA FRAME
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DATA PACKET
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FUNCTION CODE
…………………………………..
20
CODE 3(10).
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CODE 16(10).
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NOTES FOR REMOTE PROGRAMMING
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ERROR CODES
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21
UNACCEPTABLE DATA
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ILLEGAL DATA
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POLLING FREQUENCY
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MODBUS MAPPING TABLE
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22
9) FAIL SAFE FUNCTION
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27
10) OUTPUT 4.20mA
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—
11) TECHNICAL SPECIFICATIONS OF THE EXTENSION
CABLE FOR Pt100
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12) FCD FUNCTION
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28
13) WARRANTY CONDITIONS
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14) TROUBLESHOOTING
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29
15) EQUIPMENT DISPOSAL
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16) USEFUL CONTACTS
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17) UL SPECIFICATION AND RATINGS
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30
4
NT935
SAFETY REQUIREMENTS
ATTENTION :
Carefully read the manual before starting using the control unit. Keep the instructions for future reference.
Do not open the device, touching any internal component can result in electric shock as voltages over 50 volts
can be lethal. In order to reduce the risk of electric shock, do not disassemble the back of the device. Warranty shall be
void if device is opened.
Before connecting the device to the power supply, ensure that all the connections are correct. Always disconnect
the unit from the supply before making any modification on the wiring.
Any operation on the equipment must be operated by a qualified technician.
Failure to comply with these instructions can cause damages, fires or electric shock, and possible serious
injuries!
POWER SUPPLY
The NT935 series control unit has UNIVERSAL power supply, i.e. it can be supplied at 24 to 240 Vac-Vdc, irrespectively
of polarity in Vdc. Before use, ensure that the power cable is not damaged, knotted or pinched. Do not tamper with the
power cable. Never disconnect the unit by pulling the cable, avoid touching the clamps. Do not carry out any
connecting/disconnecting operation with wet hands. To disconnect the device, do not use objects such as levers.
Immediately disconnect the device if you smell burning or see any smoke: contact technical service.
LIQUIDS
Do not expose the equipment to liquid spurts or drops, do not position it in places where humidity exceeds 90% and
never touch it with wet or humid hands during storms. If any liquid penetrates the control unit, disconnect immediately
and contact technical service.
CLEANING
Disconnect the power cable before cleaning the control unit, using a dry cloth without any solvent or detergent, and
compressed air.
OBJECTS
Never insert objects into the openings of the control unit. If this happens, disconnect the control unit and contact technical
service.
USE RESERVED TO QUALIFIED PERSONNEL
The purchased good is an advanced electronic device that should not be used by non-qualified personnel. Any operation
must be carried out by a qualified technician.
ACCESSORIES
The use of non-original accessories or spare parts may damage the unit and endanger users' safety. In event of fault,
contact technical service.
LOCATION
Install the control unit indoor, in a place protected from water splashes and sun rays. Do not place near heat sources if
exceeding the parameters stated in this manual. Position on a stable surface, far from any possible vibrations. Position
the unit as far as possible from intense magnetic fields..
REPAIRS
Do not open the control unit. In case of fault, always contact qualified personnel. The opening of the control unit and/or
the removal of the series identifying label automatically make the warranty void. The warranty seal is applied to all
devices, any attempt to open the unit would cause the seal to break the consequent automatic cancellation of the
warranty.
FUNCTION
To control the transformer correctly from a temperature point of view, enabling the VOTING function is allowed
where the load distributed between the phases of the transformer is adequately balanced.
5
NT935
Tthe following object are present inside the box :
Control unit
Start guide and QR code
2 blocks for panel mounting
1 supply terminal 3 poles pitch 5
Code: 2PL0367 - Screws tightening torque 0.5Nm
1 relay terminal 12 poles pitch 5
Code: 2PL0361- Screws tightening torque 0.5Nm
1 Pt100 sensor terminal 12 poles pitch 3.81
Code: 2PL0420 - Screws tightening torque 0.25Nm
1 terminal 2 poles pitch 5 for 4.20mA output (*)
Code: 2PL0364 or 2PL0363
Screws tightening torque 0.5Nm
1 RS485 terminal 3 poles pitch 3.81 (*)
Code: 2PL0366 - Screws tightening torque 0.25Nm
(*) only for NT935 AD version
ACCESSORIES
ATTENTION: always install the device using the terminals included in the pack.
The use of terminals other than those included with the control unit might cause malfunctions.
6
NT935
TECHNICAL SPECIFICATIONS
NT935 BASIC NT935 AD
POWER SUPPLY
Supply rated values
24-240 Vac-Vdc
50/60HZ
24-240 Vac-Vdc
50/60HZ
Maximum and minimum supply values
20-270 Vac-Vdc
50/60HZ
20-270 Vac-Vdc
50/60HZ
Vdc with reversible polarities
●
●
INPUTS
4 inputs for RTD sensors, Pt100 type with 3 wires (max section 1.5mm²)
●
●
Connections on removable terminal strips
●
●
Input channels protected
against electromagnetic
interference
●
●
Cable compensation for thermistors
500 m (1 mm²)
500 m (1 mm²)
OUTPUTS
2 alarm
relays
(ALARM AND TRIP) SPDT
●
●
1 sensor or operating failure (FAULT) relay SPST
●
●
Output relays with 10A-250Vac-res COSФ=1 contacts.
●
●
2 ventilation management relays SPST FAN 1 AND FAN 2
●
●
Modbus RTU RS485 output
NO
●
Optically
isolated 4.20 mA output
NO
●
DIMENSIONS
100x100 mm– din43700-depth 131mm (terminal block included)
Hole 92 x 92 mm
Hole 92 x 92 mm
TESTS AND PERFORMANCE
Construction in compliance with CE regulations
●
●
Protection from electrical interference EN 61000-4-4
● ●
Dielectric strength 1500 Vac for a min. between output relays and
sensors, relays and power supply, power supply and sensors
●
●
Accuracy ±1% vfs, ±1 digit
●
●
Ambient
operating
temperature from –20°C to +60°C
●
●
Humidity
90% non-
condensing
●
●
Front polycarbonate IP65
●
●
7
NT935
(*)On demand, available version from -40°C to 200°C with alarm temperature management range from 0°C to 200°C
TECHNICAL SPECIFICATIONS
NT935 BASIC NT935 AD
Housing
NORYL 94 _V0
● ●
Absorption 7,5VA
● ●
Data memory 10 years minimum
● ●
Digital linearity
of sensor
signal
● ●
Self-diagnostic circuit
● ●
Protection treatment of the electronic part
Option
Option
DISPLAY AND DATA MANAGEMENT
2x13mm displays with 3 digits to display temperatures, messages and
channels
● ●
3 LEDs to display the state of the alarms of the selected channel
(ALARM-TRIP-FAULT)
● ●
4 leds selection of display mode (SCAN-AUTO-MAN-T-MAX)
● ●
2 LEDs to display the state of FAN1 and FAN2
● ●
Temperature control from 0°C to 240°C (*)
● ●
2 alarm thresholds for channels 1-2-3
● ●
2 alarm thresholds for channel 4
● ●
2 ON-OFF thresholds for FAN 1 and FAN 2
● ●
Sensor
diagnostics
(Fcc-Foc-Fcd)
● ●
Data memory diagnostics (Ech)
● ●
Access to
programming through
front
keyboard
● ●
Automatic exit from relay programming, display and test after 1
minute's inactivity
● ●
Incorrect
programming warning
● ●
Selection between channel automatic scanning, hottest channel or
manual scanning
● ●
Storage of maximum temperatures reached by channels and alarm
status
● ●
Front key to reset the alarms
● ●
Voting
function
● ●
Intellifan function
● ●
Failsafe function
● ●
8
NT935
1) 3-digit temperature display 12) Enter/Reset button
2) Control unit series 13) Programming / Setting key
3) TRIP (red) LED 14) LED/relay test key
4) ALARM (yellow) LED 15) Modbus RS communication (green) LED (only AD)
5) FAULT (red) LED 16) 3-digit channel display
6) FAN 1 (yellow) LED 17) T-max mode selection (red) LED
7) FAN 2 (yellow) LED 18) Man mode selection (yellow) LED
8) Display mode selection key 19) Auto mode selection (green) LED
9) Fixing block 20) Scan mode selection (yellow) LED
10) UP key 21) Fixing block
11) DOWN key
FRONT PANEL
1
2 3 4 5 6 7 8
9
10
11
12
14
13
15
16
17
18
19
20
1MN0102 REV. 0
21
9
NT935
DISPLAY
The first display is dedicated to temperatures
The second display to the monitored channel.
When switching the device ON or following a reset, the display shows the NT935 control unit model : BAS (no option) or
AD, VER "00" (firmware version) and temperature range.
Pressing the MODE key, the display modes can be set:
SCAN: the monitoring unit displays all the activated (°C) and deactivated (NO) channels scanning every 2 seconds.
AUTO: the monitoring unit displays the hottest channel automatically.
MAN: manual reading of the channel temperature using the up/down .
T.MAX: the monitoring unit displays the highest temperature reached by the sensors and any situation of: alarm or fault
occurred after the last reset. Select channels with cursors , reset values with RESET.
OPERATING PROGRAM CONTROL
To control the protection levels programmed, press the PRG key twice to access the VIS display mode. By repeatedly
pressing the PRG key, you can scroll through all the previously loaded values in sequence.
After 1 minute's keyboard inactivity, the programming display procedure is automatically abandoned.
To stop the display, press the ENT key.
NOTES ON SCAN AND MAN FUNCTIONS
During the SCAN and MAN modes, the operation of the NT935 can be displayed.
1) RUN cPU:
This message appears when the unit operates regularly without any system error.
2) Ech Err:
This message appears when a damage in the EEPROM memory is detected.
Pressing Reset will cancel the message and restore the original default parameters, listed in the programming
paragraph on pages 14-15. Return the control unit to TECSYSTEM for repair.
3) CAL Err:
This message appears when damage is found in the measurement circuit.
The temperature values displayed might be incorrect. Return the control unit to TECSYSTEM for repair.
4) Pt Err :
This message appears when it is detected that one or more PT100 sensors are not working correctly, FOC, FCC
and FCD indications in the temperature sensor diagnostics paragraph on page 17. In case of Err the FAULT relay
will be de-energised.
The above messages will be displayed following the 1-2-3-4 priority stated.
NOTE: regardless of the display mode, in case of a sensor fault (fcc, foc or fcd), the control unit will automatically switch to
SCAN (PRIVILEGED SCAN) mode, immediately allowing you to see the fault on the relative channel CH. (Mode key is
disabled).
LED TEST
We suggest carrying out the control unit LED test regularly.
For this operation, press the TEST key briefly; all the displays turn on for 2 seconds.
If one of the LEDs does not work, please return the control unit to TECSYSTEM for repair.
ALARM RELAY TEST
This function allows you to carry out a test of the relay operation without having to use further devices. To start the test
procedure, keep the TEST button pressed for about 5 seconds: TST appears for 2 seconds, confirming you have entered the
Relay Test mode.
Press the SET and RESET keys to energise and de-energise the relay to be tested; the display will show ON-OFF.
After 1 minute's keyboard inactivity, the RELAY TEST procedure will be automatically abandoned.
To stop the RELAY TEST procedure, press the TEST key.
Alternatively, you can use the PT100 simulator model: SIM PT100.
ALARM RELAY SILENCING
If you want to silence the ALARM signal press the RESET key: the relay de-energises and the ALARM LED, which was
fixed, will start flashing. Silencing is automatically disabled when the temperature goes below the ALARM threshold.
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