Sentera Controls DPS-M-LP Manuel de service

DPS-M--LP DIFFERENTIAL PRESSURE

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Mounting and operating instructions

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DPS-M--LP DIFFERENTIAL PRESSURE

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Table of contents

SAFETY AND PRECAUTIONS 3

PRODUCT DESCRIPTION 4

ARTICLE CODE 4

INTENDED AREA OF USE 4

TECHNICAL DATA 4

STANDARDS 4

OPERATIONAL DIAGRAMS 5

WIRING AND CONNECTIONS 5

MOUNTING INSTRUCTIONS IN STEPS 5

VERIFICATION OF INSTALLATION 7

OPERATING INSTRUCTIONS 8

TRANSPORT AND STORAGE 11

WARRANTY AND RESTRICTIONS 11

MAINTENANCE 11

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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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DPS-M--LP DIFFERENTIAL PRESSURE

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PRODUCT DESCRIPTION

e DPS-М--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. ey are Power over Modbus supplied and parameters are accessible

via Modbus RTU (3SModbus software or Sensistant).

ARTICLE CODE

Codes Power supply Connection Imax Operating range

DPS-М--LP 24 VDC, Power over Modbus RJ45 connector on the PCB 100 mA -125—125 Pa

INTENDED AREA OF USE

■Diﬀerential pressure, air velocity or volume ﬂow measurement in HVAC applications

■Overpressurizing applications: clean rooms to avoid particle contamination or

staircases for ﬁre safety

■Underpressurizing applications: restaurant kitchens and biohazard laboratories

■Volume ﬂow application: ensuring the minimum legal ventilation rate (m3/h) for

buildings

TECHNICAL DATA

■4-digit 7-segment LED display for indicating diﬀerential pressure or air volume

ﬂow

■Built-in digital high resolution diﬀerential pressure sensor

■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

■Implemented K-factor

■Diﬀerential pressure, air volume or air velocity readout via Modbus RTU

■Air velocity can be measured via Modbus RTU (by using an external PSET-PTX-200

Pitot tube connection set)

■Selectable minimum and maximum operating ranges

■Modbus registers reset function (to factory pre-set values)

■Four LEDs for transmitter status indication

■Modbus RTU communication

■Sensor calibration procedure via tactile 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

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DPS-M--LP DIFFERENTIAL PRESSURE

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■WEEE Direc tive 2012/19/EC

■RoHs Directive 2011/65/EC

OPERATIONAL DIAGRAMS

100

Minimum

range

Output [%]

Measured value (pressure, volume ﬂow or air velocity) vs. output

Minimum

alert

Maximum

alert

Maximum

range

Diﬀerential 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

RJ45 socket (Power over Modbus)

Pin 1 24 VDC Supply voltage

Pin 2

Pin 3 AModbus RTU communication, signal A

Pin 4

Pin 5 /B Modbus RTU communication, signal /B

Pin 6

Pin 7 GND Ground, supply voltage

Pin 8

GND

24 VDC

8 mm

RJ45

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.

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Fig. 1 Mounting dimensions Fig. 2 Mounting position

24 15 10,5

2x Ø 3,

Correct Incorrect

DPS

3. Insert the cable into the cable gland.

4. Crimp the RJ45 cable and plug it into the socket, see Fig.3 and section “Wiring

and connections”.

Fig. 3 Connections

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:

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

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Fig. 4 Connecting with accessories

Application 1: Measuring diﬀerential pressure [Pa] or

volume ﬂow [m³/h] using PSET-PVC (or PSET-QF)

Application 2: Measuring volume ﬂow [m³/h] or air velocity

[m/s] using PSET-PT

DPS

+D -S

DPS

6. Switch on the power supply.

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

ТX

NBT

Slave 2

Master

Slave n

Slave 1

Slave 2

Slave 1

ТX

NBT

Master

Slave n

NOTE On a Modbus RTU network, two bus terminators (NBTs) need to be activated.

7. Put back the front cover and secure it with the screws.

8. Customise the factory settings to the desired ones via the 3SModbus software

or the Sensistant conﬁgurator. For the default factory settings, see Modbus

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 INSTALLATION

A continuous green LED1 indication as shown in Fig. 7 Power / Modbus communication

indication means the unit is powered. If LED1 is not on, check the connections again.

A blinking green LED1 indication as shown in Fig. 7 Power / Modbus communication

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indication means the unit has detected a Modbus network. If LED1 does not blink,

check the connections again.

NOTE For more information, refer to the product datasheet - Settings.

Fig. 7 Power / Modbus communication indication

ATTENTION e status of the LEDs can be checked only when the unit is energised. Take the

relevant safety measures!

ATTENTION LED intensity can be adjusted between 0 and 100 % with a step of 10 % according

to the value set in Holding register 95.

NOTE For sensor calibration and Modbus registers reset procedures, refer to section

“Operating instructions”.

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:

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

immediately. If you hold SW1 for too long, you will reset the Modbus registers! (see

Fig.8Sensor calibration and Modbus register reset).

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 a Calibration

Indication).

ATTENTION Make sure that the nozzles are disconnected and unobstructed.

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 ).

2. e Modbus registers are reset to their default values (factory pre-set).

3. During the Modbus reset procedure the display will indicate “H” (See Fig. 9 b

Modbus reset indication).

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Fig. 8 Sensor calibration and Modbus register

reset Fig. 9 Calibration & Modbus reset indication

SW1

LED1

LED2

LED3

LED4

9 a Calibration indication 9 b Modbus reset indication

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

2. Modbus communication holding registers from 1 to 3 will be reset to the default

values.

3. Remove the jumper.

ATTENTION Correct reading of air velocity is only possible 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).

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 - see the table below:

Measurement readout enabled

Value of holding register 61: Display mode:

1 Diﬀerential pressure

2Volume ﬂow rate

3Air velocity

1. Diﬀerential pressure display mode (see Fig. 11):

1.1 e LED display indicates the diﬀerential pressure level with a resolution of

0,1 Pa if the level is below 100 Pa. However, above 100 Pa, the resolution

is 1 Pa. In both cases the 3SModbus software indicates the actual value.

See Fig. 11 below.

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Fig. 11 Diﬀerential pressure display

11 a Below 100 Pa 11 b Above 100 Pa

1.2 Out of range indication:

►e display shows “Lo” every 3 seconds in case the measured diﬀerential

pressure is lower than the minimum limit of the control range set via the

relevant holding register (see Fig. 12 a).

►In case the measured diﬀerential pressure is higher than the control range

maximum limit, the display shows ‘HI’ every 3 seconds (see Fig. 12 b) .

Fig. 12 Out of range indication

12 a Below control range minimum limit 12 b Above control range maximum limit

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. 13 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. 13 b below.

Fig. 13 Air volume ﬂow and air velocity mode indications

13 a Air volume ﬂow mode (0—9999 m3/h) 13 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. 14 below.

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