Sentera Controls HPS-X-LP Service manual

HPS-X--LP DIFFERENTIAL PRESSURE
TRANSMITTER
Mounting and operating instructions

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HPS-X--LP DIFFERENTIAL PRESSURE
TRANSMITTER
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 5
MOUNTING INSTRUCTIONS IN STEPS 6
VERIFICATION OF THE INSTALLATION INSTRUCTIONS 8
OPERATING INSTRUCTIONS 9
TRANSPORT AND STORAGE 11
WARRANTY AND RESTRICTIONS 11
MAINTENANCE 11

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HPS-X--LP DIFFERENTIAL PRESSURE
TRANSMITTER
SAFETY AND PRECAUTIONS
Read all the information, the datasheet, Modbus map, 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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HPS-X--LP DIFFERENTIAL PRESSURE
TRANSMITTER
PRODUCT DESCRIPTION
e HPS-X--LP series are differential pressure transmitters (-125—125 Pa), which
are equipped with a fully digital pressure transducer 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 an analogue / modulating
output (0—10 VDC / 0—20 mA / 0—100 % PWM).
ARTICLE CODES
Codes Power supply Maximum power
consumption
Nominal power
consumption Imax Operating range
HPS-F--LP 18—34 VDC 1,3 W 1,26 W 71 mA
-125—125 Pa
HPS-G--LP 18—34 VDC 1,3 W 1,26 W 70 mA
15—24 VAC ±10 % 1 W 1 W
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
■Built-in digital high resolution differential pressure sensor
■Air velocity can be measured via Modbus RTU (by using an external PSET-PTX-200
Pitot tube connection set)
■Selectable analogue / digital output: 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: 10 Pa
■Minimum volume flow range span: 10 m3/h
■Minimum air velocity range span: 1 m/s
■Selectable response time: 0,1—10 s
■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)
■Four LED indicators for the status of the transmitter and the controlled 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

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HPS-X--LP DIFFERENTIAL PRESSURE
TRANSMITTER
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 Directive 2012/19/EC
■RoHs Directive 2011/65/EC
OPERATIONAL DIAGRAM
10
20
30
40
50
60
70
80
90
100
Min. pressure
limit
VDC
mA
PWM
Output [%]
Measured value (pressure, volume ow or air velocity) vs. output
Control
range min. Control
range max. Max. pressure limit
Dierential pressure
Volume Flow
Air velocity
Out of range LED4 ON
Within range LED2 ON
Alert LED3 ON
Alert LED3 ON
Out of range LED4 ON
WIRING AND CONNECTIONS
Article type HPS-F--LP HPS-G--LP
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 (0—10 VDC / 0—20 mA / PWM)
GND Ground AO1 Common ground
Connections Cable cross section 1,5 mm2

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HPS-X--LP DIFFERENTIAL PRESSURE
TRANSMITTER
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
HPS
+_
HPS
+_
HPS
+_
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”.
Fig. 3 Connections
Power supply
G: 15—24 VAC ±10%/
18—34 VDC
F: 18—34 VDC
Modbus RTU
A /B
Analogue / digital output
0—10 VDC/0—20 mA/PWM
5. 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:

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HPS-X--LP DIFFERENTIAL PRESSURE
TRANSMITTER
5.1 To measure differential pressure, use PSET-QF or PSET-PVC set (pressure
measurement is the unit default setting);
5.2 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 register 63. 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.
In case the K-factor is not known, volume flow is calculated from a duct
cross sectional area (holding register 63) multiplied by air velocity (Pitot air
velocity (holding register 64) should be enabled and Pitot tube connected).
5.3 To measure air velocity, use PSET-PT set and enable Pitot tube air velocity
via holding register 64. In this case the K-factor of the fan has to be 0.
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
HPS
+_
+D -S
HPS
+_
6. Connect the nozzles with the tubing.
7. Switch on the power supply.
For sensor calibration and Modbus registers reset procedures, refer to section
“Operating instructions”. Always calibrate the sensor before initial use.
NOTE
PWM voltage selection:
■When the internal pull-up resistor (JP1) is connected , the voltage source
is set via Modbus holding register 54, i.e. 3,3 VDC or 12 VDC. See Fig. 5
Pull -up resistor jumper 1.
Fig. 5 Pull-up resistor jumper 1
■When JP1 is disconnected, the output type is Open collector. See Fig. 6 PWM
(Open collector) connection.
■Only when JP1 is not connected and the analogue output (AO1) is assigned as
PWM output (via holding register 54 - see the Modbus Map), an external pull-up
resistor is used.

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HPS-X--LP DIFFERENTIAL PRESSURE
TRANSMITTER
Fig. 6 PWM (Open collector) connection
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
On a Modbus RTU network, two bus terminators (NBTs) need to be activated.
NOTE
8. Put back the front cover and secure it with the screws.
9. 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
VERIFICATION OF THE INSTALLATION INSTRUCTIONS
Continuous green LED1 indication as shown in Fig. 7 Power / Modbus communication
indication means the unit is supplied. If LED1 is not on, check the connections again.
Blinking green LED1 indication as shown in Fig. 7 Power / Modbus communication
indication means the unit has detected a Modbus network. If LED1 does not blink,
check the connections again.
For more information, refer to the product datasheet - Settings.
NOTE

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HPS-X--LP DIFFERENTIAL PRESSURE
TRANSMITTER
Fig. 7 Power / Modbus communication indication
e status of the LEDs can be checked only when the unit is energised. Take the
relevant safety measures!
ATTENTION
ATTENTION Green LED intensity can be adjusted between 0 and 100 % with a step of 10 %
according to the value set in Holding register 80.
OPERATING INSTRUCTIONS
For detailed information and settings, refer to the product Modbus register map,
which is attached to the article code on our website.
NOTE
Calibration procedure:
1. Disconnect the nozzles and make sure they are not clogged.
2. ere are two options for starting the calibration process:
Either write “1” in holding register 70 or press button SW1 for 4 seconds until the
green LED2 and yellow LED3 on the printed circuit board blink twice and release it
(see Fig.8Sensor calibration and Modbus register reset tact switch and indication).
3. After 2 seconds the green LED2 and yellow LED3 will blink twice once again
to indicate that the calibration procedure has finished (see Fig. 9 Calibration
Indication).
Make sure that the nozzles are disconnected and unobstructed.
ATTENTION
Reset of Modbus registers procedure:
1. Press tact switch SW1 for 4 seconds until the green LED2 and yellow LED3 on the
printed circuit board blink twice and hold the switch until both LEDs blink again
three times (see Fig. 8 Sensor calibration and Modbus register reset tact switch and
indication).
2. e Modbus registers are reset to their default values (factory pre-set).
Fig. 8 Sensor calibration and Modbus register
reset tact switch and indications
Fig. 9 Calibration & Modbus
reset indication
HPS

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HPS-X--LP DIFFERENTIAL PRESSURE
TRANSMITTER
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
both LEDs blink again three times, the sensor will have carried out a calibration
procedure instead of Modbus registers reset procedure.
NOTE
Communication holding registers reset procedure:
1. Put the jumper onto pins 1 and 2 of the P4 connector for more than 20 s while
the device is powered (see Fig. 10 ).
Fig. 10 Modbus holding register reset jumper
1
2
3
4
5
2. Modbus communication holding registers from 1 to 3 will be reset to the default
values.
3. Remove the jumper.
Correct reading of air velocity is possible only if it is enabled by holding register
64 (Pitot air velocity) and a transmitter is connected to the appropriate Pitot tube
connection set (PSET-PTX-200).
ATTENTION
Make sure that the nozzles are free and not connected.
ATTENTION
LED indications (See Fig. 11):
1. When the green LED1 is on, the power supply is adequate and Modbus RTU
communication is active.
2. When the green LED2 is on, the measured value (pressure, volume or air velocity)
is between the minimum and maximum alert range.
3. When the yellow LED3 is on, the measured value (pressure, volume or air velocity)
is below the minimum alert range or above the maximum alert range.
4. When the red LED4 is on, the measured value (pressure, volume or air velocity) is
below the minimum measurement range or above the maximum.
Fig. 11 LED indications
5. Sensor element failure indication:
In case of failure of sensor element or loss of communication with it, the red
LED4 blinks. See Fig. 12.

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HPS-X--LP DIFFERENTIAL PRESSURE
TRANSMITTER
Fig. 12 Sensor element error
HPS
HPS
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.