Sentera Controls DSTHG-2 Service manual

Mounting and operating instructions
DSTHX-2 COMBINED TEMPERATURE
AND RELATIVE HUMIDITY DUCT
TRANSMITTER

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Table of contents
SAFETY AND PRECAUTIONS 3
PRODUCT DESCRIPTION 4
ARTICLE CODES 4
INTENDED AREA OF USE 4
TECHNICAL DATA 4
STANDARDS 4
OPERATIONAL DIAGRAMS 5
WIRING AND CONNECTIONS 5
MOUNTING & OPERATING INSTRUCTIONS IN STEPS 5
OPERATING INSTRUCTIONS 8
MODBUS REGISTER MAPS 9
VERIFICATION OF INSTALLATION INSTRUCTIONS 10
TRANSPORT AND STORAGE 10
WARRANTY AND RESTRICTIONS 10
MAINTENANCE 10
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SAFETY AND PRECAUTIONS
Read all the information, the datasheet, mounting and operating instructions and
study the wiring and connection diagram before working with the product. For
personal and equipment safety, and for optimum product performance, make sure you
entirely understand the contents before installing, using, or maintaining this product.
For safety and licensing (CE) reasons, unauthorised conversion and/ or modifications
of the product are inadmissible.
e product should not be exposed to abnormal conditions, such as: extreme
temperatures, direct sunlight or vibrations. Long-term exposure to chemical
vapours in high concentration can affect the product performance. Make sure the
work environment is as dry as possible; avoid condensation.
All installations shall comply with local health and safety regulations and local
electrical standards and approved codes. is product can only be installed by an
engineer or a technician who has expert knowledge of the product and safety
precautions.
Avoid contacts with energised electrical parts; always treat the product as if it is
live. Always disconnect the power supply before connecting, servicing or repairing
the product.
Always verify that you apply appropriate power supply to the product and use
appropriate wire size and characteristics. Make sure that all the screws and nuts
are well tightened and fuses (if any) are fitted well.
Recycling of equipment and packaging should be taken into consideration and these
should be disposed of in accordance with local and national legislation/regulations.
In case there are any questions that are not answered, please contact your
technical support or consult a professional.
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PRODUCT DESCRIPTION
e DSTHX-2 series are dual duct transmitters which measure temperature and
relative humidity. ey feature a wide range of low voltage power supply and two
analogue / modulating outputs. All parameters are accessible via Modbus RTU.
ARTICLE CODES
Article code Supply Maximum power
consumption
Nominal power
consumption Imax
DSTHG-2 18—34 VDC 1,68 W 1,26 W 70 mA
15—24 VAC ±10% 1,8 W 1,35 W 75 mA
DSTHF-2 18—34 VDC 1,68 W 1,26 W 70 mA
INTENDED AREA OF USE
Monitoring duct temperature and relative humidity in HVAC applications
TECHNICAL DATA
■Selectable temperature range: -30—70 °C
■Selectable relative humidity range: 0—100 %
■Accuracy: ±0,4 °C (0—50 °C); ±3 % rH (5—85 % rH), depending on the selected parameter
■Modbus RTU communication
■Bootloader for updating the firmware via Modbus RTU communication
■Minimum airflow velocity required: 1 m/s
■Enclosure and probe material:
►ASA, grey (RAL9002)
■Protection standard: Enclosure: IP54, probe: IP20
■Operating ambient conditions:
►temperature: 0—50 °C
►rel. humidity: 5—85 % rH, (non-condensing)
■Storage temperature: -10—60 °C
STANDARDS
■EMC Directive 2014/30/EC:
►EN 61326-1:2013 Electrical equipment for measurement, control and laboratory
use - EMC requirements - Part 1: General requirements
►EN 61326-2-3:2013 Electrical equipment for measurement, control and
laboratory use - EMC requirements - Part 2-3: Particular requirements - Test
configuration, operational conditions and performance criteria for transducers
with integrated or remote signal conditioning
■WEEE Direc tive 2012/19/EC
■RoHs Directive 2011/65/EC
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OPERATIONAL DIAGRAMS
Analogue
output 1 [%]
100
-30 Min
range
Max
range
70 T [°C]
Analogue
output 2 [%]
100
0 Min
range
Max
range
100 rH [%]
WIRING AND CONNECTIONS
Article type DSTHF-2 DSTHG-2
VIN 18—34 VDC 18—34 VDC 15—24 VAC ±10%
GND Ground Common ground AC ~
AModbus RTU (RS485), signal A Modbus RTU (RS485), signal A
/B Modbus RTU (RS485), signal /B Modbus RTU (RS485), signal /B
AO1
Analogue / modulating output 1 for
temperature measurement (0—10 VDC /
0—20 mA / PWM)
Analogue / modulating output 1 for temperature
measurement (0—10 VDC / 0—20 mA / PWM)
GND Ground AO1 Common ground
AO2
Analogue / modulating output 2 for relative
humidity measurement (0—10 VDC /
0—20 mA / PWM)
Analogue / modulating output 2 for relative humidity
measurement (0—10 VDC / 0—20 mA / PWM)
GND Ground AO2 Common ground
Connections Spring contact terminal blocks, cable cross section: 1,5 mm2
CAUTION e -F version of the product is not suited for 3-wire connection. It has separate
grounds for power supply and analogue output. Connecting both grounds
together might result in incorrect measurements. Minimum 4 wires are required
to connect -F type sensors.
e -G version is intended for 3-wire connection and features a ‘common ground’.
is means that the ground of the analogue output is internally connected with
the ground of the power supply. For this reason, -G and -F types cannot be
used together on the same network. Never connect the common ground of -G
type articles to other devices powered by a DC voltage. Doing so might cause
permanent damage to the connected devices.
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MOUNTING & OPERATING INSTRUCTIONS IN STEPS
Before you start mounting the DSTHX-2 duct transmitter, read carefully “Safety
and Precautions”.
Follow these steps:
1. When preparing to mount the DSTHX-2, bear in mind that the unit itself must be
installed onto the outer surface of the duct both via fixing the flexible flange or
directly the unit enclosure, while the probe must be inserted inside the duct, see
Fig. 1 and Fig. 2 below.
Fig. 1 Mounting dimensions
With flange Without flange
60
Ø 12
2x Ø 5
86,8
18,5
42,3
50
285
34,5
4x Ø 4,
4
70
66
100
105
80
Fig. 2 Mounting position
Correct Incorrect
AIR FLOW AIR FLOW
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2. Having selected the appropriate mounting location, proceed with the following steps:
2.1 Drill a Ø 13 mm hole into the duct and insert the probe. Apply an air-tight
sealing between probe and duct.
2.2 Fix the flange onto the duct outer surface using the self-drilling screws
delivered with the unit. If you do not intend to use the flange, insert the
tube and fix the enclosure onto the duct. Mind the airflow direction (see
Fig. 2 and Fig. 3).
Fig. 3 Mounting requirements
7,5*D(1)3,5*D
(1)D = Duct diameter
ATTENTION Installation requirements: e DSTHX-2 must not be installed in turbulent air zones.
Ensure sufficiently long settling zones upstream and downstream of the tapping point.
A settling zone consists of a straight section of pipe or duct with no obstructions. Avoid
installation near filters, cooling coils, fans, etc. e sensor will achieve the optimal
result when the measurement is taken at least 7,5 duct diameters downstream and
at least 3 duct diameters upstream from any turns or flow obstructions.
ATTENTION Installation of the unit near high EMI-emitting devices may lead to faulty
measurements. Use shielded wiring in areas with high EMI.
ATTENTION Keep at least 15 cm distance between the sensor lines and the 230 VAC power lines.
2.3 Install the tube at the desired depth and, in case you use the flange, fix it via
the plastic white screw in the flexible flange.
2.4 Unscrew the cover of the unit to remove it and insert the connecting cables
through the cable gland of theunit.
2.5 Do the wiring according to the information in section “Wiring and
connections” adhering to Fig. 4 below.
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Fig. 4 Wiring and connections
Analogue / modulating 1 - T
(0—10 VDC/0—20 mA / PWM)
Modbus
RTU
A
/B
Supply voltage
DSTHF-2: 18—34 VDC
DSTHG -2: 18—34 VDC /
15—24 VAC ±10 %
Analogue / modulating output 2 - rH
(0—10 VDC/0—20 mA / PWM)
3. Close the enclosure and fix the cover.
4. Switch on the power supply.
5. Customise the factory settings to the desired ones via the 3SModbus software
or Sensistant (if necessary). For the default factory setting see Table Modbus
register maps.
Optional settings
To assure correct communication, the NBT needs to be activated in only two devices
on the Modbus RTU network. If necessary, enable the NBT resistor via 3SModbus or
Sensistant (Holding register 9).
Example 1 Example 2
RX
ТX
NBT
NBT
NBT
Slave 2
Master
Slave n
Slave 1
Slave 2
Slave 1
RX
ТX
NBT
NBT
Master
Slave n
NOTE On a Modbus RTU network, two bus terminators (NBTs) need to be activated.
CAUTION Do not expose to direct sunlight!
OPERATING INSTRUCTIONS
Calibration procedure:
Both the relative humidity and temperature sensor elements are factory calibrated.
Recalibration is not necessary.
Bootloader
anks to the bootloader functionality, the sensor firmware can be updated via
Modbus RTU communication. To enter “Boot mode”, put a jumper onto pins 3 and
4 of the P1 header and restart the power supply (see Fig. 5). Once ‘Boot mode’ is
activated, the firmware can be updated via SM Boot application (part of 3SModbus
software suite) or Sensistant.
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Fig. 5 P1 header
12345
Put a jumper onto pins 1 and 2 and wait
for at least 5 seconds to reset the Modbus
communication parameters
12345
Put a jumper onto pins 3 and 4 and restart
the supply to enter bootloader mode
MODBUS REGISTER MAPS
MODBUS REGISTERMAP
INPUT REGISTERS
Input Registers Data type Description Data Values
1Temperature reading signed int Actual temperature level -300—700 500 = 50,0°C
2Output value 1 (T) unsigned int Output value 1 (T) 0—1.000 0 = 0 %
1.000 = 100 %
3Temperature alert ag unsigned int
Flag indicates that measured Temperature is outside set alert values. Set to
'1' when the measured value is outside the Temperature alert values dened
by holding registers 13 and 14
0—1
0 = Temperature measurement OK
1 = Temperature measurement too low/
high
4Temperature range limit ag unsigned int
Flag indicates that measured temperature is outside set range limit
values. Set to '1' when the measured temperature is outside limit range
values dened by holding registers 11 and 12
0—1 0 = Temperature range OK
1 = Temperature range too low/high
5Humidity, temperature sensor fault unsigned int Flag that shows if the communication with temperature & humidity sensor
is lost 0—1 0 = No 1 = Yes
6—9 Reserved, return 0
10 Relative humidity level unsigned int Actual relative humidity level 0—1.000 1.000 = 100,0 % rH
11 Output value 2 (rH) unsigned int Output value 2 (rH) 0—1.000 0 = 0 %
1.000 = 100 %
12 Relative humidity alert ag unsigned int
Flag indicates that measured Relative humidity is outside set alert
values. Set to '1' when the measured value is outside the Relative
humidity alert values dened by holding registers 21 and 22
0—1
0 = Relative humidity measurement OK
1 = Relative humidity measurement too
low/high
13 Relative humidity range limit ag unsigned int
Flag indicates that measured Relative humidity is outside set range limit
values. Set to '1' when the measured Relative humidity is outside limit
range values dened by holding registers 19 and 20
0—1 0 = Relative humidity range OK
1 = Relative humidity range too low/high
14 Humidity, temperature sensor fault unsigned int Flag that shows if the communication with temperature & humidity
sensor is lost 0—1 0 = No 1 = Yes
15 Dew point level signed int Calculated dew point -700—700 200 = 20,0°C
16—50 Reserved, return 0
HOLDING REGISTERS
Holding Registers Data type Description Data Values
1 Device slave address unsigned int Modbus device address 1—247
default: 1
2Modbus baud rate unsigned int Modbus communication baud rate 0—6
default: 2
0 = 4.800
1 = 9.600
2 = 19.200
3 = 38.400
4 = 57.600
5 = 115.200
6 = 230.400
3Modbus parity unsigned int Parity check mode 0— 2
default: 1
0 = 8N1
1 = 8E1
2 = 8O1
4Device type unsigned int Device type. Read only DSTHG-2 = 1.632
DSTHF-2 = 1.633
5 HW version unsigned int Hardware version of the device. Read only XXXX 0x0100 = HW version 1.0
6 FW version unsigned int Firmware version of the device. Read only XXXX 0x0200 = FW version 2.2
7 Reserved, returns 0
8 Modbus safety timeout unsigned int After time with no Modbus communication,
outputs are set to 0.
0—60
default: 0 60 = 60 minutes
9Modbus network resistor
termination (NBT) unsigned int Set device as end device of the line / or not by connecting NBT
0—1
default: 0
0 = NBT disconnected
1 = NBT connected
10 Modbus registers reset unsigned int
Resets Modbus Holding registers to default
values. When finished this register is
automatically reset to '0'
0—1
default: 0
0 = Idle
1 = Reset Modbus Registers
11 Minimum temperature range unsigned int
Minimum value of temperature range, cannot
be set higher than maximum temperature
range minus 5°C
-300 - (Max-50)
default: 0 100 = 10,0°C
12 Maximum temperature range unsigned int
Maximum value of temperature range, cannot
be set less than minimum temperature range
plus 5°C
(Min+50)—700
default: 500 500 = 50,0°C
13 Minimum temperature alert unsigned int Minimum temperature alarm value
Min. temperature range —Max.
temperature alarm
default: 0
500 = 50,0°C
14 Maximum temperature alert unsigned int Maximum temperature alarm value
Min. temperature alarm —Max.
temperature range
default: 500
500 = 50,0°C
15—18 Reserved, return 0
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HOLDING REGISTERS
Holding Registers Data type Description Data Values
19 Minimum relative humidity
range unsigned int
Minimum value of relative humidity range,
cannot be set higher than maximum relative
humidity range minus 5%
0—(Max-50)
default: 0 200 = 20,0 % rH
20 Maximum relative humidity
range unsigned int
Maximum value of relative humidity range,
cannot be set less than minimum relative
humidity range plus 5%
(Min+50)—1.000
default: 1.000 850 = 85 % rH
21 Minimum relative humidity
alert unsigned int Minimum relative humidity alarm value
Min. relative humidity range—Max.
relative humidity alarm
default: 0
200 = 20,0 % rH
22 Maximum relative humidity
alert unsigned int Maximum relative humidity alarm value
Min. relative humidity alarm —Max.
relative humidity range
default: 1.000
850 = 85 % rH
23—40 Reserved, return 0
41 Output 1 type (T) unsigned int Select analogue / modulating output 1 type 1—3
default: 1
1 = 0—10 VDC
2 = 0—20 mA
3 = PWM
42 Output 1 overwrite (T) unsigned int Enables the direct control over the temperature
output.
0—1
default: 0
0 = Disabled
1 = Enabled
43 Output 1 overwrite value (T) unsigned int Overwrite value for output 1. Active only if
Holding register 42 is set to 1.
0—1.000
default: 0
0 = 0 %
1.000 = 100 %
44 Internal voltage source
selection Output 1 (T) unsigned int Selection of internal voltage source for PWM output 1.
0—1
default: 0
0 = 3,3 VDC
1 = 12 VDC
45—50 Reserved, return 0
51 Output 2 type (rH) unsigned int Select analogue / modulating output 2 type. 1—3
default: 1
1 = 0—10 VDC
2 = 0—20 mA
3 = PWM
52 Output 2 overwrite (rH) unsigned int Enables the direct control over the relative
humidity output.
0—1
default: 0
0 = Disabled
1 = Enabled
53 Output 2 overwrite value
(rH) unsigned int Overwrite value for output 2. Active only if Holding register 52 is set to 1.
0—1.000
default: 0
0 = 0 %
1.000 = 100 %
54 Internal voltage source
selection Output 2 (rH) unsigned int Selection of internal voltage source for PWM output 2.
0—1
default: 0
0 = 3,3 VDC
1 = 12 VDC
55—80 Reserved, return 0
If you want to nd out more about Modbus over serial line, please visit: http://www.modbus.org/docs/Modbus_over_serial_line_V1_02.pdf
VERIFICATION OF INSTALLATION INSTRUCTIONS
If your unit does not function as expected, please check the connections.
TRANSPORT AND STORAGE
Avoid shocks and extreme conditions; store in original packing.
WARRANTY AND RESTRICTIONS
Two years from the delivery date against defects in manufacturing. Any modifications
or alterations to the product after the date of publication relieve the manufacturer
of any responsibilities. e manufacturer bears no responsibility for any misprints or
mistakes in this data.
MAINTENANCE
In normal conditions this product is maintenance-free. If soiled, clean with a dry or
damp cloth. In case of heavy pollution, clean with a non-aggressive product. In these
circumstances the unit should be disconnected from the supply. Pay attention that
no fluids enter the unit. Only reconnect it to the supply when it is completelydry.
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