Sentera Controls DPD-F-1K0 Service manual

Mounting and operating instructions
DPD DUAL DIFFERENTIAL
PRESSURE TRANSMITTER
WITH DISPLAY

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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 5
OPERATIONAL DIAGRAM 5
WIRING AND CONNECTIONS 6
MOUNTING INSTRUCTIONS IN STEPS 6
OPERATING INSTRUCTIONS 9
VERIFICATION OF INSTALLATION 13
TRANSPORT AND STORAGE 13
WARRANTY AND RESTRICTIONS 13
MAINTENANCE 13
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SAFETY AND PRECAUTIONS
Read all the information, the datasheet, the Modbus register map, the 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 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 DPD series are compact high resolution double differential pressure transmitters,
which are equipped with two fully digital pressure transducers designed for a wide
range of applications. Air velocity readout is available by connecting an external
Pitot tube connection set. All parameters are accessible via Modbus RTU (3SModbus
software or Sensistant). ey also feature integrated K-factor and 2 analogue /
modulating outputs (0—10 VDC / 0—20 mA / 0—100 % PWM).
ARTICLE CODES
Codes Power supply Maximum power
consumption
Nominal power
consumption Imax Operating range
DPD-F-1K0
18—34 VDC 1,85 W 1,35 W 100 mA
0—1.000 Pa
DPD-F-2K0 0—2.000 Pa
DPD-F-4K0 0—4.000 Pa
DPD-F-10K 0—10.000 Pa
DPD-G-1K0
18—34 VDC / 1,85 W 1,35 W 105 mA
0—1.000 Pa
DPD-G-2K0 0—2.000 Pa
DPD-G-4K0
15—24 VAC ±10 % 3,4 W 2,5 W 230 mA
0—4.000 Pa
DPD-G-10K 0—10.000 Pa
INTENDED AREA OF USE
■Differential pressure measurement in HVAC applications
■Volume flow measurement in HVAC applications
■Air velocity measurement (by using an external PSET-PTX-200 Pitot tube
connection set) in HVAC applications
■Differential pressure/volume flow monitoring in clean rooms
■Clean air and non-aggressive, non-combustible gases
TECHNICAL DATA
■4-digit 7-segment LED display for indicating differential pressure or air volume
flow
■2 built-in digital high resolution differential pressure sensors
■Air velocity can be measured via Modbus RTU (by using an external PSET-PTX-200
Pitot tube connection set)
■2 selectable analogue / digital outputs: 0—10 VDC / 0—20 mA / PWM (open
collector type):
►0—10 VDC mode: RL≥ 50 kΩ
►0—20 mA mode: RL≤ 500 Ω
►PWM mode: PWM Frequency: 1 kHz, RL≥ 50 kΩ
■Minimum differential pressure range span: 5 Pa
■Minimum volume flow range span: 10 m3/h
■Minimum air velocity range span: 1 m/s
■Selectable response time: 0,1—10 s
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■Implemented K-factor
■Selectable internal voltage source for PWM output: 3,3 or 12 VDC
■Differential pressure, air volume or air velocity readout via Modbus RTU
■Selectable minimum and maximum operating ranges
■Modbus registers reset function (to factory pre-set values)
■Modbus RTU communication
■Sensor calibration procedure via tact switch
■Aluminium pressure connection nozzles
■Accuracy: ±2 % of the operating range
■Operating ambient conditions:
►Temperature: -5—65 °C
►Rel. humidity: < 95 % rH (non-condensing)
■Storage temperature: -20—70 °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
OPERATIONAL DIAGRAM
0102030405060708090100
10
20
30
40
50
60
70
80
90
100
VDC,
mA,
PWM
Output [%]
Dierential Pressure Range [%], Pa
Control range
Minimum
Control range
Maximum
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WIRING AND CONNECTIONS
Article type DPD-F DPD-G
Vin 18—34 VDC 18—34 VDC 13—26 VAC
Ground Common ground AC ~
GND Ground / AC ~
AModbus RTU (RS485), signal A
/B Modbus RTU (RS485), signal /B
AO1 Analogue / modulating output 1 (0—10 VDC / 0—20 mA / PWM)
GND Ground AO1 Common ground
AO2 Analogue / modulating output 2 (0—10 VDC / 0—20 mA / PWM)
GND Ground AO2 Common ground
Connections
Cable cross section 1,5 mm2
Cable gland clamping range 3—6 mm
Connecting tube diameter 6 mm
ATTENTION 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.
MOUNTING INSTRUCTIONS IN STEPS
Before you start mounting the unit, read carefully “Safety and Precautions”.
Choose a smooth surface for installation (awall, panel, etc.) and follow these steps:
1. Unscrew the front cover of the enclosure to remove it.
2. Fix the enclosure onto the surface by means of suitable fasteners while adhering
to the mounting dimensions shown in Fig. 1 and the correct mounting position
shown in Fig. 2 below.
Fig. 1 Mounting dimensions Fig. 2 Mounting position
2x Ø 3,
4
49
52
Correct Incorrect
DPD
+_
DPD
+_
DPD
+_
3. Insert the cable into the cable gland.
4. Connect as shown in Fig.3 Connections adhering to the information in section
“Wiring and connections”.
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Fig. 3 Wiring and connections
GND GND GND
/B
Vin AAO1
AO2
5. Switch on the power and perform a calibration procedure (refer to section
“OPERATING INSTRUCTIONS”) .
6. Connect the nozzles to the duct (see Fig. 4). Depending the application you must
use a specific connection set to connect the nozzles of the unit to the duct:
6.1 To measure differential pressure, use PSET-QF or PSET-PVC set (pressure
measurement is the unit default setting);
6.2 To measure volume flow, use PSET-PT Pitot tube connection set, PSET-QF
or PSET-PVC connection set. If you use PSET-PT, you should enter the duct
cross sectional area [cm²] in Modbus holding register 63 for sensor module
1 or in holding register 83 for sensor module 2. If you use PSET-QF or PSET-
PVC, enter the K-factor of the fan (provided by the fan /motor manufacturer)
in Modbus holding register 62 for sensor module 1 or in holding register 82 for
sensor module 2.
In case the K-factor is not known, volume flow is calculated from a duct cross
sectional area (holding register 63 for sensor module 1 or in holding register
83 for sensor module 2) multiplied by air velocity (Pitot air velocity (holding
register 64) should be enabled and Pitot tube connected).
6.3 To measure air velocity, use PSET-PT set and enable Pitot tube air velocity via
holding register 64 for sensor module 1 or in holding register 84 for sensor
module 2. In this case the K-factor of the fan has to be 0.
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Fig. 4 Connecting with accessories
Application 1: Measuring differential pressure [Pa] or
volume flow [m³/h] using PSET-PVC
Application 2: Measuring volume flow [m³/h] or air velocity [m/s]
using PSET-PT
DPD
+_
DPD
+_
Sensor module 1
+ -
Sensor module 2
7. Connect the nozzles with the tubing.
8. Switch on the power supply.
For sensor calibration and Modbus registers reset procedures, refer to section
“Operating instructions”.
NOTE
PWM voltage selection:
■When the internal pull-up resistors (JP1 for sensor module 1 and JP2 for sensor
module 2) are connected , the voltage source is set via Modbus holding register 54
for sensor module 1 and holding register 74 for sensor module 2, i.e. 3,3 VDC or
12 VDC. See Fig. 5 Pull -up resistor jumpers.
Fig. 5 Pull-up resistor jumpers
JP2 JP1
■When JP1 and JP2 are disconnected, the output type is Open collector. See Fig. 6
PWM (Open collector) connection example.
■Only when JP1 and JP2 are not connected and the analogue outputs (AO1 and
AO2) are assigned as PWM output (via holding registers 54 and 74 - see the
Modbus Map), external pull-up resistors are used.
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Fig. 6 PWM (Open collector) connection example
PWM GND
External voltage
source (5—30 VDC)
External pull-up
resistor
50—100 kΩ
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
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.
9. Put back the front cover and secure it with the screws.
10.Customise the factory settings to the desired ones via the 3SModbus software
or the Sensistant configurator. For the default factory settings, see Modbus
register map.
For the complete Modbus register data, refer to the product Modbus Register
Map, which is a separate document attached to the article code on the website
and contains the registers list. Products with earlier firmware versions may not be
compatible with this list.
NOTE
OPERATING INSTRUCTIONS
NOTE For detailed information and settings, refer to the product Modbus register map,
which is attached to the article code on our website.
Calibration procedure (Fig. 7):
1. Sensor module 1:
1.1 Disconnect the nozzles and make sure they are not clogged.
1.2 ere are two options for starting the calibration process:
■Either write “1” in holding register 70 or press tact switch SW1 for about 5
seconds until the blue LED3 on the printed circuit board blinks twice and release
it. During the calibration procedure the display will indicate C 1 - C (Fig. 7 a).
1.3 After the calibration is done, the blue LED3 will blink twice once again to
indicate that the calibration procedure has finished.
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2. Sensor module 2:
2.1 Disconnect the nozzles and make sure they are not clogged.
2.2 ere are two options for starting the calibration process:
■Either write “1” in holding register 90 or press tact switch SW2 for about 5
seconds until the blue LED4 on the printed circuit board blinks twice and release
it. During the calibration procedure the display will indicate C 2 - C (Fig. 7 b).
2.3 After the calibration is done, the blue LED4 will blink twice once again to
indicate that the calibration procedure has finished.
Fig. 7 Calibration indication
7 a Calibration indication sensor module 1 7 b Calibration indication sensor module 2
.
ATTENTION Make sure that the nozzles are disconnected and unobstructed.
Reset of Modbus holding registers procedure:
1. ere are two options for starting the Modbus reset process:
■Write ‘1’ in holding register 10 or press tact SW1 until the blue LED3 on the
printed circuit board blinks two times and do not release the switch until LED3
blinks again three times.
2. All Modbus registers, except the communication related registers 1—9, are reset
to their default values (factory pre-set). During the Modbus reset procedure the
display will indicate “H” (see Fig. 8).
Fig. 8 Sensor calibration and Modbus holding register reset tact switches and
indication
SW2
SW1
ATTENTION Press and hold the tact switch until both LEDs on the PCB blink twice and hold
it until both LEDs blink again three times. If the tact switch is released before
the LED blinks again three times, the sensor will have carried out a calibration
procedure instead of Modbus registers reset procedure.
Display settings
e display is enabled via writing “1” in holding register 91 (Measurement readout).
Writing “0” will disable the display.
When the display is enabled, its mode depends on the value in holding register 61
(Operating mode). ere are three display modes activated via writing the relevant
figure in holding register 61 (Operating mode sensor 1) and 81 (Operating mode
sensor 2). See the table below:
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Measurement readout enabled
Value of holding register 61 / 81: Display mode:
1 Differential pressure
2Volume flow rate
3Air velocity
Фи
1. Differential pressure display mode (see Fig. 9):
1.1 e LED display shows the differential pressure with a resolution of 1 Pa. An
example of displaying 1.000 Pa is given in Fig. 9 below.
Fig. 9 Differential pressure display
2. Air volume flow display mode:
2.1 Air volume flow rate within the range 0—9999 m3/h is displayed with a
resolution of 1 m3/h. An example of displaying 100 m3/h is given in Fig. 10
a below.
2.2 Air volume flow rate above 10.000 m3/h is displayed divided by 1.000. An
example of displaying 10.000 m3/h is given in Fig. 10 b below.
Fig. 10 Air volume flow and air velocity mode indications
10 a Air volume flow mode (0—9999 m3/h) 10 b Air volume flow mode (10.000 m3/h)
3. Air velocity display mode:
3.1 Air velocity is displayed with a resolution of 0,1 m/s. An example of displaying 1,0
m/s is given in Fig. 11 below.
Fig. 11 Air velocity mode
NOTE Correct reading of air velocity is possible only if it is enabled by holding register
64 (for sensor 1) and 84 (for sensor 2) and the transmitter is connected to the
appropriate Pitot tube connection set (PSET-PTX-200).
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Display indications
e table below shows the display indications according to the measured parameter:
Table 1 Display indications
Parameter Differential pressure Volume flow Air velocity
Under the minimum
range
Sensor 1
Sensor 2
Above the maximum
range
Sensor 1
Sensor 2
Within the range
Sensor 1
Sensor 2
The display changes its indication as follows:
1. Channel 1 indication (3 seconds)
2. Channel 1 measured pressure/volume flow/air velocity (6 seconds)
3. Channel 2 indication (3 seconds)
4. Channel 2 measured pressure/volume flow/air velocity (6 seconds)
5. Return to indication 1
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VERIFICATION OF INSTALLATION
After switching on the power supply, the green ON/OFF LED on the printed circuit
board must be on solid indicating that the unit is powered (Fig. 12 Operating
indication). If the LED is OFF, check the connections.
Blinking green RX and TX LEDs indicate that the unit has detected a Modbus
network (Fig. 13). If they do not blink, check the connections.
Fig.12 Operating indication Fig. 13 Modbus communication
indication
ON/OFF LED
TX - transmitting
RX - receiving
e status of the LEDs can be checked only when the unit is powered. Take the
relevant safety measures!
ATTENTION
TRANSPORT AND STORAGE
Avoid shocks and extreme conditions; stock 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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DPD