Omega DPS20 User guide

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Page 1

User’s Guide

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DPS20 Series

Panel Meter for

Load cell signals

6-Digit, 1⁄8 DIN Panel Mount

Page 2

www.omega.com [email protected]

Servicing North America:

U.S.A. Omega Engineering, Inc. Headquarters: Toll-Free: 1-800-826-6342 (USA & Canada only)

Customer Service: 1-800-622-2378 (USA & Canada only) Engineering Service: 1-800-872-9436 (USA & Canada only) Tel: (203) 359-1660 Fax: (203) 359-7700 e-mail: [email protected]

For Other Locations Visit omega.com/worldwide

The information contained in this document is believed to be correct, but OMEGA accepts no liability for any errors it contains, and reserves the right to alter specications without notice.

Page 3

WARRANTY/DISCLAIMER

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 61 months from date of purchase. OMEGA’s WARRANTY adds an additional one (1) month grace period to the normal five (5) year product warranty to cover handling and shipping time. This ensures that OMEGA’s customers receive maximum coverage on each product.

If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer Service Department will issue an Authorized Return (AR) number immediately upon phone or written request. Upon examination by OMEGA, if the unit is found to be defective, it will be repaired or replaced at no charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of the purchaser, including but not limited to mishandling, improper interfacing, operation outside of design limits, improper repair, or unauthorized modification. This WARRANTY is VOID if the unit shows evidence of having been tampered with or shows evidence of having been damaged as a result of excessive corrosion; or current, heat, moisture or vibration; improper specification; misapplication; misuse or other operating conditions outside of OMEGA’s control. Components in which wear is not warranted, include but are not limited to contact points, fuses, and triacs.

OMEGA is pleased to offer suggestions on the use of its various products. However, OMEGA neither assumes responsibility for any omissions or errors nor assumes in accordance with information provided by OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by it will be as specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESS OR IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF LIABILITY: The remedies of purchaser set forth herein are exclusive, and the total liability of OMEGA with respect to this order, whether based on contract, warranty, negligence, indemnification, strict liability or otherwise, shall not exceed the purchase price of the component upon which liability is based. In no event shall OMEGA be liable for consequential, incidental or special damages.

CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in medical applications or used on humans. Should any Product(s) be used in or with any nuclear installation or activity, medical application, used on humans, or misused in any way, OMEGA assumes no responsibility as set forth in our basic WARRANTY / DISCLAIMER language, and, additionally, purchaser will indemnify OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the Product(s) in such a manner.

liability for any damages that result from the

use of its products

RETURN REQUESTS/INQUIRIES

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID PROCESSING DELAYS). The assigned AR number should then be marked on the outside of the return package and on any correspondence.

The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent breakage in transit.

FOR WARRANTY RETURNS, please have the following information available BEFORE contacting OMEGA:

1. Purchase Order number under which the product was PURCHASED,

2. Model and serial number of the product under warranty, and

3. Repair instructions and/or specific problems

relative to the product.

OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords our customers the latest in technology and engineering.

OMEGA is a registered trademark of OMEGA ENGINEERING, INC.

© Copyright 2018 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied, reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without the

prior written consent of OMEGA ENGINEERING, INC.

FOR NON-WARRANTY REPAIRS, for current repair charges. Have the following information available BEFORE contacting OMEGA:

1. Purchase Order number to cover the COST of the repair,

2. Model and serial number of the product, and

3. Repair instructions and/or specific problems

relative to the product.

consult OMEGA

Page 4

DPS20

Load cell panel meter and controller

1. Panel meter DPS20

Panel meter for load cells, size 96 x 48 mm (1/8 DIN)

Instruction Manual

Digital panel meter, with 96 x 48 mm (1/8 DIN) size and 6 digits with 14 mm digit height, for load cell signals. Provides excitaon voltage congurable to +5 Vdc or +10 Vdc to power up to 8 standard 350 Ohms cells. Scalable reading from 999999 to -199999 with congurable decimal point.

Tare funcon, with congurable controls, and ‘auto-tare’ funcon for automac tare correcon when weight is removed from the cell. Three working modes with dierent acquision speeds and noise rejecon to 50 and 60 Hz.

Output and control opons with 1, 2 and 3 relays, isolated analog outputs, Modbus RTU communicaons, transistor outputs, SSR control outputs, RS-485 ASCII and RS-232.

Independent alarms congurable as maximum or minimum, with acvaon at setpoint or when reading is stable, with 1 or 2 setpoints per alarm, hysteresis, independent acvaon and deacvaon delays, congurable inverted acvaon of the relay and congurable locked alarms (see secon 1.12.8).

Front protecon IP65. Connecons by plug-in screw ter-

minals. For industrial applicaons.

Funcons included :

•

tare accessible from frontal key or rear contact

on 1.11)

• automac ‘auto-tare’ funcon (see secon 1.12.4)

• access to gross weight value and tare value (see sec-

on 1.9.5)

• funcon ‘On Power Up’ for automac acvaon of

funcons at start-up (see secon 1.12.14)

• scale factor for easy modicaon of reading units (see

secon 1.12.5)

• ‘stock units’ funcon to count units (see secon 1.12.6)

• access to the measured signal value (in mV), excitaon

current provided (in mA) and real excitaon voltage (see

secon 1.12.13)

• congurable ‘Fast access’ menu (key ‘UP’ (5)) with

access to selected funcons (see secon 1.12.13)

Mulple display lters, memory for maximum and minimum, password, 5 congurable brightness levels.

(see sec-

1.1 How to use this manual

If this is the rst me you are conguring this instrument, below are the steps to follow to install and congure the in strument. Read all the manual secons in order to have a

1. Power and signal connecons

- connect the power (see secon 1.8)

- connect the signal (see secon 1.8)

- read recommendaons to connect the ‘sense’ (see secon

1.8.1) and for load cell ground connecons (see secon

1.8.2)

2. Inial setup (see secon 1.12.2)

- theorecal conguraon of the cell (obtain the load cell data : sensivity, load and excitaon) and congure the instrument

- apply the empirical conguraon of the cell (apply the high and low ‘eld correcon’)

- assign the ‘system zero’

3. Advanced conguraon (oponal) (see secon 1.12.7)

- tare conguraon, see secons 1.11 and 1.12.4

full and clear view of the characteriscs of the instrument.

Do not forget to read the installaon precauons

1.19

- funcon ‘stock units’ (see secon 1.12.6)

- scale factor (see secon 1.12.5)

- acquision modes (see secon 1.9.1)

4. Congure the alarms (oponal) (see secon 1.12.8)

5. Display lters (oponal) (see secon 1.12.10)

6. Congure operator controls (oponal)

- congure the rear control (see secon 1.12.11)

- congure the front key ‘LE’ (3)(see secon 1.12.12)

- congure the fast access (key ‘UP’ (5)) (see secon 1.12.13)

7. Congure other funcons (oponal)

- congure the ‘on power up’ funcon (see secon 1.12.14)

- congure the password and brightness level (see secon 1.12.17)

8. Congure the output and control opons: analog (AO) or serial (RTU, S4, S2) (see secon 1.12.18)

at secon

Page 5

DPS20

Load cell panel meter and controller

1.2 Index

Instruction Manual

1. Panel meter DPS20 . . . . . . . . . . . . . . . . . 4

1.1 How to use this manual . . . . . . . . . . . . 4

1.2 Index . . . . . . . . . . . . . . . . . . . . . . . 5

1.3 How to order . . . . . . . . . . . . . . . . . . 5

1.4 Material included . . . . . . . . . . . . . . . . 6

1.5 Addional informaon . . . . . . . . . . . . . 6

1.6 Front view . . . . . . . . . . . . . . . . . . . . 6

1.7 Rear view . . . . . . . . . . . . . . . . . . . . 6

1.8 Signal and power connecons . . . . . . . . . 7

1.8.1 Connecng the ‘sense’ . . . . . . . . . . . 7

1.8.2 Connecng the cell to the ground . . . . . 7

1.8.3 Real cases . . . . . . . . . . . . . . . . . . 7

1.9 Technical specicaons. . . . . . . . . . . . . 8

1.9.1 Acquision modes . . . . . . . . . . . . . . 8

1.9.2 Signal ranges . . . . . . . . . . . . . . . . . 9

1.9.3 Number and type of cells accepted . . . . 9

1.9.4 Mechanical dimensions (mm (in)) . . . . . 9

1.9.5 Gross weight, net and tare . . . . . . . . . 9

1.10 Included funcons. . . . . . . . . . . . . . .10

1.11 ‘Tare’ funcons included . . . . . . . . . . .10

1.12 Conguraon . . . . . . . . . . . . . . . . .11

1.12.1 How to operate the menus . . . . . . . .11

1.12.2 Inial set-up . . . . . . . . . . . . . . . .12

1.12.3 Inial setup menu . . . . . . . . . . . . .13

1.12.4 Funcon ‘auto-tare’ . . . . . . . . . . . .14

1.12.5 Scale factor . . . . . . . . . . . . . . . . .14

1.12.6 Funcon ‘stock’. . . . . . . . . . . . . . .14

1.12.7 Advanced conguraon menu . . . . . .15

1.12.8 Alarms. . . . . . . . . . . . . . . . . . . .16

1.12.9 Alarm conguraon . . . . . . . . . . . .17

1.12.10 Display lters . . . . . . . . . . . . . . .18

1.12.11 Rear controls . . . . . . . . . . . . . . .19

1.12.12 Front key ‘LE’ (3). . . . . . . . . . . . .19

1.12.13 Fast access. . . . . . . . . . . . . . . . .20

1.12.14 ‘On power up’ funcon. . . . . . . . . .20

1.12.15 ‘Fast access’ conguraon menu . . . .21

1.12.16 ‘On power up’ conguraon . . . . . . .21

1.12.17 Tools . . . . . . . . . . . . . . . . . . . .22

1.12.18 Access to opons conguraons menu 22

1.13 Full conguraon menu. . . . . . . . . . . .25

1.14 Factory conguraon . . . . . . . . . . . . .27

1.15 Messages and errors . . . . . . . . . . . . .27

1.16 Praccal cases . . . . . . . . . . . . . . . . .28

1.16.1 Normal case . . . . . . . . . . . . . . . .28

1.16.2 Load cell with external power. . . . . . .28

1.16.3 Connecons with a juncon box . . . . .28

1.16.4 Connecons with 3 or 4 load cells . . . .29

1.16.5 Measuring mV at the laboratory . . . . .29

1.17 To access the instrument . . . . . . . . . . .30

1.18 Modular architecture . . . . . . . . . . . . .30

1.19 Precauons on installaon . . . . . . . . . .31

1.20 Warranty . . . . . . . . . . . . . . . . . . . .31

1.21 CE declaraon of conformity . . . . . . . . .31

2. Output and control modules . . . . . . . . . . .32

2.1 Módules R1, T1 and SSR . . . . . . . . . . . .32

2.2 Module AO

. . . . . . . . . . . . . . . . . . .33

2.2.1 Conguraon menu . . . . . . . . . . . . .34

2.2.2 Error codes . . . . . . . . . . . . . . . . . .34

2.2.3 Factory conguraon . . . . . . . . . . . .34

2.3 Module RTU . . . . . . . . . . . . . . . . . . .35

2.3.1 Accessible registers . . . . . . . . . . . . .35

2.3.2 Conguraon menu . . . . . . . . . . . . .36

2.3.3 Excepon codes . . . . . . . . . . . . . . .36

2.3.4 Descripon for Modbus RTU registers . . .37

2.4 Module S4 . . . . . . . . . . . . . . . . . . . .38

2.4.1 Accessible registers . . . . . . . . . . . . .38

2.4.2 Conguraon menu . . . . . . . . . . . . .39

2.4.3 Factory conguraon . . . . . . . . . . . .39

2.4.4 Frame types . . . . . . . . . . . . . . . . .40

2.4.5 Frame structure . . . . . . . . . . . . . . .40

2.4.6 Error codes . . . . . . . . . . . . . . . . . .40

2.4.7 Frame examples . . . . . . . . . . . . . . .41

2.4.8 CRC calculaon . . . . . . . . . . . . . . .41

2.5 Module S2 . . . . . . . . . . . . . . . . . . . .42

3. How to open and close. . . . . . . . . . . . . . .44

3.1 How to open the housing . . . . . . . . . . .44

3.2 How to close the housing . . . . . . . . . . .45

1.3 How to order

Model Power Opon 1 Others

DPS20

HV- -

-HV (85-265 Vac/dc)

-LV (11/60 Vdc,

24 Vac, 48 Vac)

Opon 2

(1 relay)

-R1

-AO

(analog output)

-RTU (Modbus RTU)

-S4 (RS-485)

-S2 (RS-232)

-T1 (1 transistor)

-SSR (1 SSR drive)

- (empty)

(1 analog output per instrument)

-R1 (1 relay)

-AO

(analog output)

-RTU (Modbus RTU)

-S4 (RS-485)

-S2 (RS-232)

-T1 (1 transistor)

-SSR (1 SSR drive)

- (empty)

Opon 3

-R1 (1 relay)

-AO

(analog output)

-RTU (Modbus RTU)

-S4 (RS-485)

-S2 (RS-232)

-T1 (1 transistor)

-SSR (1 SSR drive)

- (empty)

-NBT (no buons)

-GN (green led)

Page 6

DPS20

Load cell panel meter and controller

Instruction Manual

1.4 Material included

The shipment includes :

- 1 instrument DPS20

- 1 pack of orange power terminals

- 1 pack of green signal terminals

- 1 user’s manual

- 1 set of units label (see Figure 1)

If the instrument mounts output and control opons (see secon 2), the shipment also includes:

- 1 pack of green signal terminals for each output and con trol opon installed

1.6 Front view

Alarms and ‘A’,‘B’ leds

Key ‘LE’

(see secon 1.12.13)

Key ‘UP’

‘Fast access‘

Front leds ‘A’ and ‘B’ show the acve funcon (see Table 1). See secon 1.9.5 for a denion on gross weight, net weight and tare. The manual acvaon of the ‘tare’ acvates a fast ash on led ‘B’.

Key ‘SQ’ ‘Conguraon menu’

(see secon 1.12)

Units

Figure 1 - Set of units label

1.5 Addional informaon

You can nd more informaon at www.omega.com website.

Reading A B

Gross weight on o

Actual tare value o on

‘tare’ funcon acvated o fast ash

Net weight o o

Units (‘stock units’)

Table 1 - Meaning for the front leds ‘A’ and ‘B’

on on

1.7 Rear view

Opon 1 Opon 2Opon 3

1234567 890

(see secon 1.8)

Signal

Power

(see secon 1.8)

Page 7

DPS20

Load cell panel meter and controller

1.8 Signal and power connecons

Instruction Manual

1234567

Vexc+

Sense+

Signal+

Signal-

Sense-

Vexc-

7 EK ‘on / o’ rear control

(short circuit to ‘Vexc-’)

6 Vexc+ Excitaon voltage +

5 Sense+ Excitaon voltage sense +

4 Signal+ Signal +

3 Signal- Signal -

890

8 Neutral AC / Negave DC

9 Not connected

0 Phase AC / Posive DC

Figure 3 - Power connecons

Fuse : to comply with the security regulaon 610101, add to the power line a protecon fuse acng as

a disconnecon element, easily accessible to the operator and idened as a protecon device.

• Power ‘H’ 250 mA me-lag fuse

• Power ‘L’ 400 mA me-lag fuse

2 Sense- Excitaon voltage sense -

1 Vexc- Excitaon voltage -

Figure 2 - Signal connecons

1234567

Vexc+

Sense+

Signal+ Signal-

Sense-

Vexc-

Figure 4 - Example for connecons with 1 load cell.

1.8.1 Connecng the ‘sense’

Measuring with load cells requires a stable and accurate excitaon voltage. Connecng the ‘sense +’ and ‘sense -’ terminals to the load cell, provides the instrument with an accurate value of the excitaon voltage received by the cell. Deviaons and errors from the standard excitaon value are automacally compensated by the instrument, increasing the accuracy and reliability of the measure.

If you do not wish to use the ‘sense ’, place a shortcircuit be tween terminals ‘sense +’ and ‘Vexc+’, and between terminals ‘sense -’ and ‘Vexc-’.

For applicaons with mulple cells (2, 3, 4 cells or more) con nect the ‘sense ’ wires to the ‘electrical middle point’ of the power wires of all the cells (see secon 1.16.4).

1.8.2 Connecng the cell to the ground

Measuring with load cells requires an electrically clean installaon. When connecng the ground to the cell system, assure that :

The ‘sense’ terminals must be always connected. If you do not use the ‘sense’, shortcircuit with

‘Vexc’ terminals (see secon 1.8.1).

• the cell connecon to ground is performed in such a way

that the current to ground DOES NOT ow through the cell.

1.8.3 Real cases

See secon 1.16 for dierent examples on how to connect the load cell and congure the instrument.

Page 8

DPS20

Load cell panel meter and controller

1.9 Technical specicaons

Instruction Manual

Digits

number of digits 6 led 7 segments color red or green digit height 14 mm

Reading

max. reading 999999 min. reading -199999 decimal point congurable X.X.X.X.X.X overrange ash reading underrange ash reading

Load cells

type of cells 1 mV/V, 2 mV/V, 3 mV/V and others excitaon voltage congurable 5 Vdc or 10 Vdc max. excitaon current 140 mA Vexc. protecon against shortcircuit

(see error at secon 1.15) max. terminals voltage 30 Vdc number of cells* 1 to 8 load cells (power 5 Vdc)

1 to 4 load cells (power 10 Vdc)

*(values calculated for standard 350 Ohms load cells. For cells with dierent impedance, the number is limited by the 140 mA available current)

Measure

signal ranges (see secon 1.9.2) accuracy at 25 ºC (see secon 1.9.2) thermal stability 50 ppm/º input impedance 20 MOhm acquisions / second see Table 2

(and refresh for alarms, analog outputs and bus)

display refresh see Table 2

step response see Table 2

0 % to 99 % signal

signal terminals

plug-in screw terminals (pitch 3.81 mm)

Power

power ‘H’ 85 to 265 Vac/dc power ‘L’ 11 to 60 Vdc and 24/48 Vac isolaon* 2500 Ve with power ‘H’ *(60 seconds) 1500 Ve with power ‘L’ consumpon <1.5 W only meter <4.0 W meter with opons power terminals

plug-in screw terminals (pitch 5.08 mm)

wire secon 1 to 2.5 mm2 (AWG17 to AWG14)

Conguraon front keypad with 3 keys

Front protecon IP65

Output and control opons

relay, analog, communicaons, ...

(see secon 2)

Mechanical

mounng panel connecons plug-in screw terminal housing ABS, polycarbonate (V0) weight <150 gr. front size 96 x 48 mm (1/8 DIN) panel cut-out 92 x 44 mm depth 91 mm (including terminals)

Temperature

operaon 0 to +50 ºC storage 20 to +70 ºC warm-up me 15 minutes

1.9.1 Acquision modes

The instrument works by default with a fast acquision mode of 16 acquisions per second, with a noise rejecon opmized for 50 and 60 Hz frequencies. Two addional faster acquision modes are available, opmized for noise rejecon to a single specic frequency of 50 Hz or 60 Hz.

To opmize the noise rejecon only to 50 Hz and / or increase the acquision speed to 50 acquisions per second, congure

Acquisions / sec. Display refresh Step response

Mode standard 16 acq. / sec. 16 refresh / sec. 63 mSec.

Mode 50 Hz 50 acq. / sec. 16 refresh / sec. 20 mSec.

Mode 60 Hz 60 acq. / sec. 16 refresh / sec. 17 mSec.

Table 2 - Technical data for the congured acquision mode

the ‘Mode’ (‘ModE’) parameter to ‘50.hZ’ value. This selec on increases the speed to 50 acquisions per second and increases the noise rejecon to 50 Hz, although it reduces the noise rejecon to 60 Hz. Congure the parameter value to ‘60. hZ’ to increase to 60 acquisions per second and maximum rejecon to 60 Hz noise, reducing the noise rejecon for 50 Hz.

To congure the mode see secon 1.12.7.

Page 9

DPS20

Load cell panel meter and controller

1.9 Technical data (cont.)

Instruction Manual

1.9.2 Signal ranges

The instrument works with 6 internal signal ranges and the acve range is automacally selected when the instrument is started. The selecon depends on the value of the two parameters : ‘Sensivity’ (‘MV.V’) and ‘Excita-

on voltage’ (‘V.EXc’) (see secon 1.12.2)

Example : with a sensivity conguraon of 2.0000 mV/V and a congured excitaon voltage of 10 Vdc, the instrument selects the 20 mV input signal range, by calculating 2 mV/V x 10 Vdc = 20 mV.

The internal signal ranges available are shown below at Table 3.

Signal

ranges

mVdc 0.05% FS

0/100

mVdc 0.05% FS

0/30

Accuracy Max. input

signal

1.9.4 Mechanical dimensions (mm (in))

(3.78 x 1.89 in)

(0.63 in)

(2.95 in) (0.31 in)

Panel cut-out

(3.63 x 1.74 in)

0/20

mVdc 0.05% FS

30 V

0/15

mVdc 0.05% FS

0/10

mVdc 0.05% FS

0/5

mVdc 0.05% FS

Table 3 - Input signal ranges

1.9.3 Number and type of cells accepted

The instrument accepts connecon for up to 8 standard 350 Ohms load cells. With a congured excitaon voltage of 10 Vdc connect from 1 to 4 load cells. With a congured excitaon voltage of 5 Vdc connect from 1 to 8 load cells. For load cells with dierent impedance, calculate the current consumpon for each cell, and the total must not exceed the maximum current the instrument can provide.

In case of problems with the power or the signal provided by the load cells, the instrument provides three funcons for troubleshoong purposes. These funcons allow to access the signal input value (in mV), the excitaon voltage value at the ‘sense’ terminals (in Vdc) and the current provided to the cells (in mA). The operator can use this values to idenfy the cause of the problem. See secon

1.12.13 for more informaon on how to access this values in real me.

1.9.5 Gross weight, net and tare

The instrument shows the value for the net weight, and can be congured to switch reading to gross weight and the actual value of the tare. The relaon between them is :

• Net weight = gross weight - tare

Operator can access these values by conguring the fast ac cess menu (key ‘UP (5)) (see secon 1.12.13).

Reading the gross weight or tare values acvate the front leds ‘A’ and ‘B’ (see secon 1.6).

Page 10

DPS20

Load cell panel meter and controller

1.10 Included funcons 1.11 ‘Tare’ funcons included

Acvate the tare funcon to force the instrument to take the

Included funcons Secon

Funcon tare yes 1.11

Auto-tare

Maximum tare

Scale factor

Stock of units

Modes

automac zero tare

to prevent undesired tare acvaons

change the reading scale

counts units instead of weight

high rejecon to 50 Hz and 60 Hz

standard

1.12.4

1.12.7

1.12.5

1.12.7

1.12.6

1.9.1

stability alarms double setpoint

Alarms

acvaon delays deacvaon delays

1.12.8

hysteresis inverted relay locked deacvaon

1.12.10

Display lters

xed digits recursive ‘steps’ le zeros

Rear controls

Front key ‘LE’ (3)

acvate funcons from rear terminal

acvate funcons from key ‘LE’

(3)

1.12.11

1.12.12

fast access to param-

Fast access (key ‘UP’ (5))

On power up

Memory

Password

Troubleshoong func

ons

eters from front key ‘UP’

(5)

acvate funcons at power up

maximum and minimum

blocks access to conguraon menu

values for input signal, excitaon voltage and excitaon current

1.12.13

1.12.14

1.12.13

1.12.17

1.9.3

1.12.13

Display brightness 5 levels 1.12.17

Table 4 - Funcons included

actual signal as a ‘0’ weight. The tare funcon does not mod ify the internal calibraon of the cell, and can be acvated as many mes as needed. The tare funcon is typically used to set a ‘0’ reading when a xed weight has been added to the load cell.

Example : a truck enters a loading area and is placed on a weighing system. The instrument indicates that the weight of the truck is 2.500 Kg. A tare is applied to the instrument, and now the reading is 0 Kg. The truck enters the loading area and when it leaves, it is placed on the weighing system again. Now the reading is 1.550 Kg. This is the weight of the mate rial loaded on the truck. When the truck leaves the weighing system the instrument reads -2.500 Kg. Acvate a tare again to force a reading of 0 Kg or wait for a new truck.

The instrument accepts dierent ways to acvate the tare funcon:

• from the rear terminal, shortcircuit the ‘EK’ terminal against

the ‘Vexc-’ terminal. Previously, congure the ‘EK’ terminal with the tare funcon (see secon 1.12.11).

• from the front keypad, press the front key ‘LE’ (3). Previ

ously, congure the ‘LE’ (3) key with the tare funcon (see

secon 1.12.12).

• automacally when the instrument starts. Previously, con

gure the ‘on power up’ funcon with the tare funcon (see

secon 1.12.14).

• automacally with the ‘auto-tare’ funcon. The inherent

mechanical characteriscs of a load cell makes the ‘zero weight’ signal a non constant value. This can be detected by placing and removing the same weight from a load cell, several mes. When the weight is removed, the reading is not always ‘0’, but a random value close and around ‘0’. The ‘auto-tare’ funcon automates the acvaon of the ‘tare’ when the reading of the instrument is stable and close to ‘0’

(see secon 1.12.14).

To avoid accidental tares, the instrument provides the ‘Max. Tare’ (‘MAX.t’) parameter. The acvaon of the ‘tare’ func

on, either manual or automac, is not applied if the reading is higher than the value dened in this parameter (see secon

1.12.7).

The actual tare value can be accessed from the front key ‘UP’ (5) acvang the ‘Tare’ funcon at the ‘Key UP’ menu (see secon 1.12.15). A reset to the tare value can be applied also from this same menu.

Instruction Manual

Page 11

DPS20

Load cell panel meter and controller

1.12 Conguraon

1.12.1 How to operate the menus

Instruction Manual

The instrument has two menus accessible to the user :

‘Conguraon menu’ (key ‘SQ’) (<)

‘Fast access’ menu (key ‘UP’) (5)

Conguraon menu

The ‘conguraon menu’ modies the conguraon parameters to adapt the instrument to the applicaon needs. To access the ‘conguraon menu’ press for 1 second the ‘SQ’ (<) key. This access can be blocked by acvang the ‘Password’ (‘PASS’) funcon. While operang the ‘congu- raon menu’, the alarm status is ‘hold’ to the status it had before accessing the menu, and the output and control modules remain in ‘error’ state. When leaving the ‘congu- raon menu’, the instrument applies a system reset, followed by a brief disconnecon of the alarms and the output and control modules. Funconality is then recovered

For a detailed explanaon on the ‘conguraon menu’ see the following secons, and for a full view of the ‘congura- on menu’ see secon

‘Fast access’ menu

1.13.

’

The ‘fast access’ menu is an operator congurable menu, providing fast and direct access to the most usual funcons of the instrument with a single key pad stroke. Press key ‘UP’ (5) to access this menu

leaves from the conguraon menu. Then changes are applied and the instrument is back to normal funcon. When entering a numerical value, it selects the acve digit, and the value is then modied by key ‘UP’ (5).

‘

Rollback

’

Aer 30 seconds without interacon from the operator, the instrument will rollback and leave the ‘conguraon menu’ or the ‘fast access’ menu. All changes will be discarded

Example of operaon inside the ‘conguraon menu’.

(4)

1. The (<) key enters into the ‘conguraon menu’.

(4)

2. The (<) key enters into

(4)

the ‘InP’ menu.

3. The (5) key moves

(4)

through the menu opons.

(6)

(1)

(3)

(2)

(5)

(3)

(5)

(3)

(5)

(3)

(5)

(3)

4. The (<) key selects the

(3)

desired range and returns to the ‘InP’ menu.

See secon

1.12.15

for a list of selectable funcons for

the ‘fast access’ menu in this instrument. The ‘Password’ (‘PASS’) funcon does not block access to this menu. Ac- cessing and modifying parameters in the ‘fast access’ menu does not interfere with the normal funconality of the instrument, and it does not generate any system reset when validang the changes.

Operang with the front keypad inside the menus Key ‘SQ’ (<) - press the ‘SQ’ (<) key for 1 second to ac-

cess the ‘conguraon menu’. Inside the menu, the ‘SQ’ (<) key acts as an ‘ENTER’. It enters into the menu opon selected, and when entering a numerical value, it validates the number

Key ‘UP’ (5) - press the ‘UP’ (5) key to access the ‘fast ac- cess’ menu. Inside the menu,the ‘UP’ (5) key sequenally

moves through the available parameters and menu entries. When entering a numerical value, it modies the digit selected by increasing its value to 0, 1, 2, 3, 4, 5, 6, 7, 8, 9

Key ‘LE’ (3) - press the ‘LE’ (3) key to acvate the con- gured special funcons associated to this key. Inside the menu, the ‘LE’ (5) acts as an ‘ESCAPE’. It leaves the selected menu level and eventually, by leaving all menu levels, it

5. The (3) key leaves the actual level and moves to the previous menu level.

6. The (3) key leaves the ‘conguraon menu’. Changes are applied and saved at this moment.

Figure 5 - Example of operaon inside the ‘conguraon menu’ (menu entries are given as example, and may not be the exactly the same as the instrument menu entries).

Page 12

DPS20

Load cell panel meter and controller

1.12.2 Inial set-up

Instruction Manual

Before starng to congure the instrument, idenfy the parameters of the load cell, at the manufacturers datasheet (see Table 5). If the parameters are not know, leave the instrument with the default values.

Load cell

parameters

Sensivity 2 Nominal weight 1000

Excitaon voltage 10

Table 5 - Parameters of the load cell

For an accurate measure, the instrument needs to correctly congure its parameters for the parcular load cell connect ed. The conguraon procedure has a rst theorecal step and a second empirical step. The third and nal step will set the ‘system zero’ of the instrument.

Theorecal conguraon of the load cell

The theorecal parameters are congured at the ‘Parameters of the cell’ (‘cELL’) menu.

• at the ‘Decimal point’ (‘dP’) parameter, place the decimal

point according to the resoluon you want to see.

• at the ‘Nominal weight’ (‘LoAd’) parameter introduce the

nominal weight of the load cell. The value is entered with the resoluon congured in the parameter above.

• at the ‘Sensivity’ (‘MV.V ’) parameter, introduce the value

of the cell sensivity.

• at the ‘Excitaon voltage’ (‘V.EXc’) parameter, select 5 or

10 Vdc. (The ‘LAb’ value enables the laboratory mode, for di rect measure from a millivolt generator instead of a load cell

(see secon 1.16.5)).

Example : load cell with 1.95 mV/V sensivity and a nominal value of 5 Kg and power 5 Vdc. To read in grams with a deci mal point, congure the theorecal parameters as indicated below :

Decimal point : XXXXX.X Sensivity : 1.95 mV/V Nominal weight : 5000.0 Excitaon voltage : 5 Vdc

When the theorecal values are congured, leave the cong uraon menu. Apply a ‘system zero’. Force a tare, and place dierent weights to check if the reading is correct. If it is not correct, apply the empirical conguraon and again the ‘sys- tem zero’.

Empirical conguraon of the load cell

The second part of the load cell conguraon is an empiri cal process of eld correcon. The instrument will detect and

Default values

mV/V

Kilos

Vdc

correct the individual deviaons of this parcular load cell.

For the empirical conguraon you will need access to two weights : a low weight, as small as possible (it can be the cell without weight) and a high weight as close as possible to the nominal weight of the cell.

In each case the meter will be informed of the real weight applied to the cell in order to correct and compensate for the measured deviaons at the signal. Both correcons are need (high and low) for a correct conguraon of the load cell.

• low weight correcon : place the load cell without weight

or with the smallest weight possible, and access the ‘Low weight correcon’ (‘F.Lo’) menu. Press key SQ (‘<’), intro duce the value of the weight and press again SQ (‘<’). The instrument will ash shortly and return to the menu entry

‘Low weight correcon’ (‘F.Lo’).

• high weight correcon : place the load cell with a weight

closest to nominal and access the ‘High weight correcon’ (‘F.hI’) menu. Press key SQ (‘<’), introduce the value of the weight and press again SQ (‘<’). The instrument will ash shortly and return to the menu entry ‘High weight correc on’ (‘F.hI’).

Once both correcons are applied, leave the conguraon menu. Force a tare, and place dierent weights to check that the reading is correct. As a last step, assign the ‘system zero’ if you want to access gross weight and net values.

Assign the ‘system zero’

This is a necessary and important step for a correct measure ment with a load cell.

• assign the ‘system zero’ : place the load cell without weight

or with the weight that will be considered as ‘zero’ and access the ‘System zero’ (‘S.ZEr’) parameter. Press key SQ (‘<’). The instrument will ash shortly and return to the menu entry ‘System zero’ (‘S.ZEr’).

The empirical conguraon of the load cell recalcu lates and updates the theorecal sensivity value

(‘Sensivity mV/V’ (‘M V.V’) parameter). Manual

modicaons of this parameter will modify the conguraon of the cell. To prevent accidental modicaon consider the acvaon of the ‘password’ funcon (see secon

1.12.17).

Once the load cell has been correctly congured, and the reading of the instrument is correct, it is not

necessary to access again this part of the congura-

on menu. If you need to scale the reading to dierent units, use the ‘Scale factor’ (‘ScL.F) parameters at the ‘Advanced

conguraon’ menu (see secon 1.12.7).

Page 13

DPS20

Load cell panel meter and controller

1.12.3 Inial setup menu

Instruction Manual

Press ‘SQ’ (<) for 1 second to access the ‘conguraon menu’. For a descripon on how to op-

erate inside the menus see secon full vision of the ‘conguraon menu’ structure see secon

Inial

conguraon

1.13.

Load cell

parameters

Deci

mal point

Nominal weight

Sensivity

mV/V

Excitaon

voltage

1.12.1.

5 Vdc

10 Vdc

Laboratory

mode

For a

At the inial set up of the instrument, rst congure the theorecal part of the load cell at the

‘Load cell parameters’ (‘cELL’) menu and later congure the empirical part of the load cell at the ‘Field correcon’ (‘F.cor’) menu.

See

sec-

on 1.12.2 for addional informaon.

• at the ‘Decimal point’ (‘dP’) parameter,

select the decimal point posion. Move the decimal point with key ‘LE’ (3). The posion dened will be used for all reading parameters.

Example : to read in ‘Kg’ with tenths of kilograms, place the decimal point at ‘XXXXX.X’ and the reading will be always be shown with 1 decimal.

Changing the posion of the decimal point will only light a dierent decimal point led, but will not modify or re-scale the measure of the instrument.

• at the ‘Sensivity mV/V’ (‘MV.V ’) parameter, congure the

value for the load cell sensivity. Accepts any value between

0.0001 and 99.9999 mV/V. Default value is 2.0000 mV/V.

• at the ‘Nominal weight’ (‘LoAd’) parameter, congure the

nominal weight of the load cell. accepts any value between 0 and 999999. The decimal point will be shown in the posi on congured at the ‘Decimal point’ (‘dP’) parameter. Default value is 1000.

Field

correcon

System zero

Low weight

correcon

High weight

correcon

Low weight

value

High weight

value

Example : for a 5 Kg cell, congure a value of 5000 to read in grams.

• at the ‘Excitaon voltage’ (‘V.Exc’) parameter, congure

the voltage to power the load cell. Select ‘5 Vdc’ or ‘10 Vdc’. Default value is 10 Vdc. Select ‘LAb’ for a millivolt meter mode in laboratory (see secon 1.16.5).

The ‘Field correcon’ (‘F.cor’) menu includes the funcons for the empirical conguraon of the load cell. See secon 1.12.2 for addional informaon on each funcon.

• at the ‘Low weight correcon’ (‘F.Lo’) parameter, intro

duce the real value of the actual weight at the cell. Use the lowest weight possible, close to 0. Press key SQ (‘<’) to start the correcon process.

• at the ‘High weight correcon’ (‘F.hI’) introduce the real

value of the actual weight at the cell. Use the lowest weight possible, close to nominal weight of the cell. Press key SQ (‘<’) to start the correcon process.

The ‘System zero’ (‘S.ZEr’) entry assigns the actual weight to the ‘system zero’ of the instrument. See secon 1.12.2 for ad dional informaon.

Page 14

DPS20

Load cell panel meter and controller

Instruction Manual

1.12.4 Funcon ‘auto-tare’

The ‘auto-tare’ funcon automacally acvates the ‘tare’ when the weight is removed from the load cell. The ‘autotare’ conguraon has three parameters :

• Acvaon value : the ‘auto-tare’ funcon acvates when

reading is lower than the dened value.

• Stability band: reading must be stable, and its uctuaon

must be lower than the number of counts dened in this pa rameter.

• Stability me : reading must be within the stability band for

the me dened in this parameter.

When these three parameters are met (the system is ‘without weight’ and the reading is ‘stable’) the ‘auto-tare’ funcon au tomacally acvates the ‘tare’.

Example : weighing system with reading from 0.0 to 2500.0 Kg. When weight is removed from the system, there is al ways a variable remnant value : 2.2 Kg, 3.1 Kg, -0,7 Kg, ... This remnant value is associated to the specic imperfecons of each load cell. Also this remnant value takes some me to stabilize, approximately 1 second. A manual tare can be applied each me the load cell is unloaded in order to correct this error. The ‘auto-tare’ funcon will correct it automacally without operator intervenon, conguring the following parameters.

• acvaon value = 5.0

• stability = 1.0

• stability me = 2 seconds

When reading is lower than ‘5.0’, the ‘auto-tare’ system ac vates, and it will analyze the stability of the signal. When reading does not change more than ±1.0 counts for a me of 2 seconds, the tare will automacally acvate.

The ‘auto-tare’ funcon is aected by the ‘Maximum tare’ (‘MAX.t’) parameter. The instrument will not accept the ac vaon of the tare when reading is higher than the ‘Maximum tare’ (‘MAX.t’) value.

1.12.5 Scale factor

1.12.6 Funcon ‘stock’

The ‘Stock units’ (‘Stck’) funcon is provided to count large quanes of small units, in situaons such as stock invento ry, recepon of goods, etc. The operator must congure the number of ‘units’ assigned to a weight. The instrument will measure the weight but will show the number of ‘units’.

To congure the ‘Stock units’ funcon, weight a known num ber of units. Then introduce the number of units, either from

the conguraon menu (‘Advanced conguraon’ \ ‘Stock units’) or from the fast access menu (key ‘UP’ (5)).

Example from the conguraon menu : place 50 units on the load cell, and check that the instrument is weighing correctly. Enter the conguraon menu, and at the ‘Stock units’ (‘Stck’)

parameter, within the ‘Advanced conguraon’, introduce ‘50’ as the number of units. Save the value (key ‘SQ’ (<)) and leave the conguraon menu (key ‘LE’ (3) two mes).

The instrument restart and reads 50 units. Add more units and observe that the reading increases proporonally to the number of units.

Example from the front key ‘UP’ (5) : congure the func on ‘Stock units’ to be accessible from the front key ‘UP’ (5)’ (fast access menu) (see secon 1.12.13) and leave the con guraon menu. Place 50 units on the load cell, and check that the instrument is weighing correctly. Access the parameter ‘Stock units’ through the front key ‘UP’ (5), and congure the number of units actually on the load cell (50 units). Save the value (key ‘SQ’ (<)) and leave the fast access menu (key ‘LE’ (3)). The instrument reads 50 units. Add more units and observe that the reading increases proporonally to the

number of units

In both cases, seng a value to the ‘Stock units’ (‘Stck’) pa rameter assigns the value to the actual weight. The actual value of units (‘Stock units’ (‘Stck’) parameter) can be assigned to the actual weight by pressing front key ‘LE’ (3) (see secon

1.12.12) and/or acvang the rear terminal ‘EK’ (see secon

1.12.11).

Assign the value ‘0’ to the ‘Stock units’ (‘Stck’) parameter to disable this funcon and return to normal reading of weight.

The ‘Scale factor’ (‘ScL.F’) congures a xed mulplier to ap ply to the reading.

Example: a weighing system is congured to read in Kg, but the system is going to be shipped to an area where measure must be in pounds. The relaon between kilograms and pounds is: 1 Kg = 2,20462 pounds. Within the scale factor, congure the mulplier to 220462 and the divider to 100000. The instrument is now congured to read in ‘pounds’.

Page 15

DPS20

Load cell panel meter and controller

1.12.7 Advanced conguraon menu

Advanced conf.

Auto-tare

Acvaon value

Instruction Manual

At the ‘Auto-tare’ (‘Aut.t’) menu congure the acvaon val- ue and stability values to control the automac acvaon of the tare, when weight is removed from the cell. See secon

1.12.4 for addional informaon.

Maximum tare

Scale factor

Stock units

Mode

Stability band

Stability me

Mulplier

Divider

Units

Standard

50 Hz

60 Hz

• at the ‘Acvaon value’ (‘SEt’) parameter, congure the

working limits for the ‘auto-tare’. The ‘auto-tare’ only ac vates for lower values of reading. Accepts any value between 0 and 999999. Default value is 1000.

• at the ‘Stability band’ (‘bAnd’) parameter, congure the

number of counts allowed to consider a signal ‘stable’. The ‘auto-tare’ only acvates if the reading uctuates within this band of counts. Accepts any value between 0 and 999999. Default value is 10.

• at the ‘Stability me’ (‘tIME’) parameter, congure the

minimum me, in tenths of second, for the signal to be within the stability band to consider it ‘stable’. Accepts any value between ‘0.0’ and ‘99999.9’. Default value is ‘0.0’.

Value 0 at the stability band and/or 0.0 at the stability me, disable the ‘auto-tare’ funcon.

The tare is automacally acvated when reading is lower than the acvaon value, and the uctuaon of the reading is lower than the counts dened at the ‘stability band’ for the me dened at the ‘stability me’.

At the ‘Maximum tare’ (‘MAX.t’) parameter, congure the maximum value of reading to allow for a tare to be applied. See secon 1.12.4 for addional informaon. Accepts any val ue between 0 and 999999. Default value is 999999.

At the ‘Scale factor’ (‘ScL.F’) parameter, congure the value for the mulplier and the divider. See secon 1.12.5 for addi onal informaon. Accepts any value between 0 and 999999. Default value is 1.

At the ‘Stock units’ (‘Stck’) parameter, congure the number of units for the actual weight. See secon 1.12.6 for addional informaon. Accepts any value between 0 and 999999. De fault value is 0 (funcon disabled).

At the ‘Mode’ (‘ModE’) parameter, congure the acquision mode. See secon 1.9.1 for addional informaon. Default value is ‘Standard’ (‘Std’).

Page 16

DPS20

Load cell panel meter and controller

1.12.8 Alarms

Instruction Manual

The instrument manages 3 independent internal alarms, each one controlling the acvaon of an oponal relay, transistor or SSR control output. These outputs are oponal (see secon

2) and are installed at the free slots of the instrument (see secon 1.18).

The instrument has three front leds that reect the state of the three internal alarms, idened as ‘1’, ‘2’ and ‘3’.

• Congurable parameters

Each alarm has several conguraon parameters, starng with the usual setpoint, hysteresis and maximum (alarm acve when reading is higher than setpoint) or minimum (alarm acve when reading is lower than minimum) alarm types (see Figure 6).

• Acvaon and deacvaon delays

Each alarm can congure independent acvaon and deac vaon delays. These delays aect the alarm as a whole, and the delay will aect the front led and the associated relay.

• Stability acvaon

The stability acvaon delays the alarm acvaon unl the reading is stable (see Figure 7).

Applicaon : the lling of a tank with liquid is controlled with a load cell. Upon reaching 5000 liters, the alarm 1 acvates to stop the lling pump. Aer the pump has stopped, the liquid is sll moving inside the tank, and this movement is reected in weight and reading oscillaons. Alarm 2 is congured as ‘stability alarm’ and acvates when the liquid inside the tank is at rest. At this moment, the tank can be removed safely.

• Second setpoint

Conguring a second setpoint creates ‘windowed alarms’. The windowed alarm controls with a single relay output if the reading is inside or outside the values dened (see Fig ure 8).

• Inverted relay

Acvate the ‘inverted relay’ funcon to invert the acvaon logic of the associated relay.

Reading

hysteresis

o

acvaon

o

Figure 6 - Examples of alarms with 1 setpoint

Reading

5000

AL1

o

AL2

o

Figure 7 - Example of alarm with stability

delay

Set points 1 and 2

Alarm 2 as maximum with stability.

Alarm 1 as maximum.

deacvaon delay

setpoint

Alarm as maximum, no hysteresis and no delays

Alarm as maximum, with hysteresis and delays

Alarm as minimum,no hysteresis and no delays

• ‘Locked alarms’

Acvate the ‘locked alarms’ funcon to force the operator to interact with the instrument when an alarm has acvated. Once acvated, the alarm will remain locked at acve state, even if the reading returns to a value below setpoint, unl the operator manually unlocks the alarms by pressing the front key ‘LE’ (3).

Reading

Set point 2

Set point 1

Alarm as minimum, with

o

Figure 8 - Example of alarm with double setpoint

double setpoint, no hysteresis and no delays

Page 17

DPS20

1.12.9 Alarm conguraon

Alarms

Load cell panel meter and controller

Alarm 1

Acve

Type of alarm

Setpoint

Hysteresis

Acvaon

delay

Deacvaon

delay

Stability Stability band

Instruction Manual

Alarms 1, 2 and 3 are congured from menu ‘ALr1’, ‘ALr2’ or ‘ALr3’. See secon 1.12.8 for addional informaon.

•

at the ‘Acve’ (‘Act’) parameter select ‘on’

•

at the ‘Type of alarm’ (‘TypE’) parameter, select ‘MAX’

for maximum alarm (acvates when reading is higher than setpoint), or ‘MIn’ for minimum alarm (acvates when reading is lower than setpoint).

•

at the ‘Setpoint’ (‘SEt’) parameter, congure the alarm

acvaon point

. Value accessible through the ‘fast access’

menu (see secon 1.12.13).

•

at the ‘Hysteresis’ (‘hySt’) parameter, select the hyster-

esis value. Hysteresis applies to the alarm deacvaon. Alarm deacvates once the reading is beyond the setpoint plus the hysteresis value. Hysteresis prevents relay switching in case of signal uctuaons close to the setpoint value

•

at the ‘Acvaon delay’ (‘dEL.0’) parameter, congure

the delay to apply before the alarm is acvated. Delay starts to count once the setpoint is reached. Value from

0.0 to 99.9 seconds

•

at the ‘Deacvaon delay’ (‘dEL.1’) parameter, cong-

ure the delay to apply before the alarm is deacvated. Delay starts to count once the setpoint is reached plus the hysteresis value. Value from 0.0 to 99.9 seconds

Setpoint 2

Inverted relay

Locked alarm

Stability me

• at the ‘Stability’ (‘StbL’)

parameter, congure the condions to detect stability at the signal and acvate the alarm. Value ‘0’ at ‘stability band’ or at ‘stability me’ deacvate the stability control of the alarm.

- at the ‘Stability band’ (‘bAnd’) parameter, congure the

number of counts that the reading can change and sll be considered stable. Values from 0 to 999999. Default is 10.

- at the ‘Stability me’ (‘tIME’) parameter, congure the

me, in tenths of second, that the reading must be within the ‘stability band’ to be considered stable.

Values from 0.0

to 99999.9. Default is 0.0.

• to work with ‘windowed alarmas’ congure ‘Setpoint 2’

(‘SEt2’) to ‘on’ and congure the value for the second set point. The second setpoint must always be higher than the rst setpoint.

• at the ‘Inverted relay’ (‘r.Inv’) parameter, congure ‘on’

to invert the acvaon of the relay.

Relay is inacve when

alarm is acve, and relay is acve when alarm is inacve

• at the ‘Locked alarm’ (‘A.Lck’) parameter, congure ‘on’

to block the automac alarm deacvaon. Alarm deacva on must be performed manually, by pressing the front key ‘LE’ (3) (see secon 1.12.12) or rear control (see secon

1.12.11).

Page 18

DPS20

Load cell panel meter and controller

1.12.10 Display lters

The instrument provides several funcons to act upon the reading in order to increase stability, reduce noise and adapt to parcular needs. These funcons are grouped under the ‘Display’ (‘dISP’) menu and are explained below :

• the ‘Fixed digits’ (‘FIX.d’) funcon allows to x each digit

to a xed value. Typically, one or more right digits are xed to ‘0’. Fix digits starng from the right. Value ‘-’ indicates that the digit is not xed.

• the ‘Average lter’ (‘AVr’) applies a recursive lter upon

the reading values, in order to reduce oscillaons due to noisy signals. Congure the lter strength between ‘0’ and ‘100’. The lter is stronger with higher values. Increasing the strength of the lter slows the reading. Value ‘0’ disables the lter.

• the ‘Steps’ (‘StEP’) funcon congures the reading to be

done in steps of 1, 2, 5, 10, 20 or 50 counts.

Instruction Manual

Display Fixed digits Fix digits

Average lter 0 to 100

Steps

Example: congure a step of 20 and the reading will change in steps of 20 counts (‘1420’, ‘1440’, ‘1460’, ...).

• the ‘Le zero’ (‘LZEr’) funcon lights all zeros to the le.

• the ‘Memory of maximum’ (‘MAX’) displays the maximum

reading stored on memory. To reset this memory, ‘rSt’ input.

The value can be accessed through the ‘fast ac-

select the

cess’ menu at front key ‘UP’ (5) (see secon 1.12.13).

• the ‘Memory of minimum’ (‘MIn’) displays the minimum

reading stored on memory. To reset this memory, ‘rSt’ input.

The value can be accessed through the ‘fast ac-

select the

cess’ menu at front key ‘UP’ (5) (see secon 1.12.13).

Le zeros

Memory of

maximum

Memory of

minimum

Page 19

DPS20

Load cell panel meter and controller

1.12.11 Rear controls

The instrument provides a digital ‘on/o’ input at the rear terminals, referenced as ‘EK’ (see secon 1.8). Assign funcons to this terminal and acvate these funcons with a short circuit between terminal ‘EK’ and terminal ‘Vexc-’. Funcons available are explained below :

Rear controls

Instruction Manual

Tare

• the ‘Tare ’ (‘tArE’) funcon applies a tare.

• the ‘Alarm unlock’ (‘A.LcK’) funcon unlocks all alarms

that are locked due to the ‘Locked alarms’ funcon (see sec

on 1.12.8).

• the ‘Stock units’ (‘Stck’) funcon assigns the actual weight

to the number of units dened at the ‘stock units’ parameter (see secon 1.12.6).

In case of mulple funcons enabled, the acvaon is per formed sequenally in the same order as the conguraon menu (rst is the tare, then the alarm unlock, etc).

Alarm unlock

Stock units

1.12.12 Front key ‘LE’ (3)

The front key ‘LE’ (3) can be congured to acvate a set of funcons. Funcons available are explained below :

• the ‘Tare ’ (‘tArE’) funcon applies a tare.

• the ‘Alarm unlock’ (‘A.LcK’) funcon unlocks all alarms

that are locked due to the ‘Locked alarms’ funcon (see sec

on 1.12.8).

• the ‘Stock units’ (‘Stck’) funcon assigns the actual weight

to the number of units dened at the ‘stock units’ parameter (see secon 1.12.6).

In case of mulple funcons enabled, the acvaon is per formed sequenally in the same order as the conguraon menu (rst is the tare, then the alarm unlock, etc).

Key LE Tare

Alarm unlock

Stock units

Page 20

DPS20

Load cell panel meter and controller

1.12.13 Fast access

Instruction Manual

The ‘fast access’ is an operator congurable menu. When congured, the operator can access the most usual funcons with a single press of the front key ‘UP’ (5). Funcons available are listed below :

• access to alarm setpoints from the front key ‘UP’ (5) al

lows to read and modify the actual setpoint values

• access to the ‘stock units’ parameter from the front key

‘UP’ (5) allows to read and modify the actual ‘stock value’ parameter. See secon 1.12.6 for addional informaon about the ‘stock units’ funcon.

• values for ‘gross weight’ and ‘tare’ are accessible from the

front key ‘UP’ (5) (see secon 1.9.5). To reset the tare value visualize the value and press key ‘UP’ (5). When message ‘rSt’ appears, press key ‘SQ’ (<). The instrument returns to visualize the ‘tare’ value. Press key ‘LE’ (3) to leave the menu.

• funcons ‘signal mV’, ‘exc. voltage’ and ‘exc. current’

ve access to values for the input signal measured in mV, the excitaon voltage measured in Vdc between terminals ‘sense+’ and ‘sense-’, and the excitaon current measured in mA provided from the instrument to the load cell

• access to maximum and minimum memories from the

front key ‘UP’ (5) allows to visualize the values. To reset the maximum or minimum value, visualize the value, and press key ‘UP’ (5). When message ‘rSt’ appears, press key ‘SQ’ (<). The instrument returns to visualize the actual memory

value. Press key ‘LE’ (3) to leave the menu

The ‘fast access’ menu is not aected by the password func on, allowing to have a locked access to the general conguraon menu, while sll some funcons are accessible to the operator through the ‘fast access’ menu.

• Super fast access

If only one funcon is congured at the ‘fast access’ menu, pressing the front key ‘UP’ (5) will shortly read the name of the funcon and then automacally show into the value.

These three funcons act as an integrated voltmeter and ammeter, to be used for troubleshoong purposes, as they give informaon on the real signals received and provided to the load cell.

1.12.14 ‘On power up’ funcon

The ‘On power up’ (‘on.Pu’) menu allows to dene a series of funcons to acvate when the instrument restarts aer a power loss.

Funcons available are a delay on the acvaon of measure and control funcons, and a tare funcon.

While on delay mode, the instrument shows all decimal points lightened and ashing, all alarms are deacvated, and there is no signal acquision or communicaons control. When the delay me is over, the instrument starts its normal funcon ing.

These funcons will acvate only aer a restart due to powerloss, they will not apply aer a restart due to changes in con guraon.

Delay the measure and control funcons gives me to slow system elements to start completely before the instrument begins to acquire signal and control the outputs.

Page 21

DPS20

Load cell panel meter and controller

1.12.15 ‘Fast access’ conguraon menu

Key UP

(‘Fast access’)

Setpoint 1

Setpoint 2

Setpoint 3

Instruction Manual

At the ‘Key UP (‘fast access’)’ (‘K.uP’) menu congure which funcons and parameters will be accessible through the ‘fast access’ menu. Select ‘on’ to acvate each funcon. See secon 1.12.13 for addional informaon.

• the ‘Setpoint 1’ (‘ALr1’) funcon allows to visualize and

modify the setpoint for alarm 1.

• the ‘Setpoint 2’ (‘ALr2’) funcon allows to visualize and

modify the setpoint for alarm 2.

• the ‘Setpoint 3’ (‘ALr3’) funcon allows to visualize and

modify the setpoint for alarm 3.

Stock units

Gross weight

Tare value

Signal mV.

Exc. voltage

Exc. current

Memory of

maximum

• the ‘Stock units’ (‘Stck’) funcon allows to visualize and

modify the quanty of units dened at the ‘stock units’ pa

rameter (see secon 1.12.6).

• the ‘Gross weight’ (‘GroS’) funcon allows to visualize the

gross weight.

• the ‘Tare value’ (‘tArE’) funcon allows to visualize the ac

tual tare value.

• the ‘Signal mV’ (‘c.MV’) funcon allows to visualize the

actual value of the input signal, without scaling. Value is of fered in mV.

• the ‘Exc. voltage’ (‘c.EXc’) funcon allows to visualize the

actual value of the excitaon voltage, measured between terminals ‘sense+’ and ‘sense-’. Value is oered in Vdc.

• the ‘Exc. current’ (‘c.MA’) funcon allows to visualize the

actual value of the current provided by the instrument to the load cell. Value is oered in mA.

• the ‘Memory of maximum’ (‘MAX’) or ‘Memory of mini

mum’ (‘MIn’) allows to visualize and/or reset the actual val-

ue of the maximum and minimum memory.

Memory of

minimum

1.12.16 ‘On power up’ conguraon

On power up Delay

Tare

Seconds

The ‘On power up’ (‘on.Pu’) menu assigns funcons to apply when the instrument restarts aer a power loss. See secon

1.12.14 for addional informaon.

• at the ‘Delay’ (‘dLAy’) parameter congure the me the

instrument waits before starng normal operaon. Value be tween 0 and 200 seconds.

• at the ‘tare’ (‘tArE’) parameter congure to ‘on’ to acvate

a tare every me the instrument restarts aer a power loss.

Page 22

DPS20

Load cell panel meter and controller

1.12.17 Tools

The ‘Tools’ (‘tooL’) menu groups funcons with a variety of uses.

• at the ‘Password’ (‘PASS’) funcon dene a 6 digit code to

block access to the ‘conguraon menu’. Acvate the pass word to prevent access to the instrument conguraon by non authorized personnel. To acvate the ‘Password’ func on select ‘on’ and enter the code.

The numerical code is asked when accessing the ‘congu raon menu’ (key‘SQ’ (<)). Funcons congured to be accessible through the ‘fast access’ menu are not ‘Password’ blocked.

• at the ‘Factory conguraon’ (‘FAct’) select ‘yes’ to ac-

vate the default factory conguraon (see secon 1.14 for a list of default parameters). The cell conguraon parameters (‘Inial conf.’ (‘Init’) menu) are not aected by this reset if the ‘Reset ‘inial conf.’’ (‘F.InI’) parameter is ‘o’.

• at the ‘Reset ‘inial conf’’ (‘F.InI’) parameter select ‘on’ to

include the cell conguraon parameters when acvang the default factory conguraon.

Instruction Manual

Tools Password

Factory

conguraon

Reset

‘inial conf.’

Version

Minimum

Brightness

Standard

The factory reset applied to the ‘inial conguraon’ parameters aects the cell conguraon parameters.

For a correct reading, a new cell conguraon must

be applied, as indicated in secon 1.12.2.

• the ‘Version’ (‘VEr’) parameter informs about the rmware

version loaded on the instrument.

• At the ‘Brightness’ (‘LIGh’) parameter select the intensity

of the display brightness. Five levels available. With this funcon the instrument brightness can be adapted to match the brightness of nearby instruments.

Maximum

1.12.18 Access to opons conguraons menu

The ‘OPt.1’, ‘OPt.2’ and ‘OPt.3’ menu entries give access to the conguraon menus for the oponal modules installed at Opt.1, Opt.2 and Opt.3 slots.

See secon 2 for a list of the dierent modules available that can be installed on each slot. The conguraon menu for each module is described at the User’s Manual of each module.

Access to the oponal module installed at slot 1

Access to the oponal module installed at slot 2

Access to the oponal module installed at slot 3

Page 23

DPS20

Load cell panel meter and controller

Instruction Manual

This page blank

Page 24

DPS20

Load cell panel meter and controller

1.13 Full conguraon menu

Press ‘SQ’ (<) for 1 second to access the ‘conguraon menu’.

Mode

Instruction Manual

Standard

50 Hz

Inial conf.

Load cell

parameters

Field

correcon

Deci

mal point

Nominal weight

Sensivity

mV/V

Excitaon

voltage

Low weight

correcon

High weight

correcon

Modo

laboratorio

Low weight

value

High weight

value

5 Vdc

10 Vdc

Alarms

Alarm 1

60 Hz

Acve

Type of alarm

Setpoint

Hysteresis

Acvaon

delay

Advanced conf.

system zero

Auto-tare

Maximum tare

Scale factor

Deacvaon

delay

Stability Stability band

Acvaon value

Stability me

Stability band

Setpoint 2

Stability me

Inverted relay

Locked alarm

Mulplier

Divider

Stock units

Page 25

DPS20

Load cell panel meter and controller

Instruction Manual

Display Fixed digits Fix digits

Average lter 0 to 100

Steps

Le zeros

Memory of

maximum

Key LE Tare

Alarm unlock

Stock units

Key UP

(fast access)

Setpoint 1

Setpoint 2

Memory of

minimum

Rear controls Tare

Alarm unlock

Stock units

Setpoint 3

Stock units

Gross weight

Tare value

Signal mV.

Exc. voltage

Exc. current

Memory max.

Memory min.

Page 26

DPS20

Load cell panel meter and controller

1.14 Full conguraon menu (cont)

Instruction Manual

On power-up

Tools Password

conguraon

‘inial conf.’

Brightness

Delay

Tare

Factory

Reset

Version

Seconds

Minimum

Opon 1

Opon 2

Opon 3

Standard

Maximum

Access to the oponal module installed at slot 1

Access to the oponal module installed at slot 2

Access to the oponal module installed at slot 3

Page 27

DPS20

Load cell panel meter and controller

Instruction Manual

1.14 Factory conguraon

Inial conguraon (‘InIt’) Load cell parameters (‘cELL’) Decimal point (‘dP’) without (XXXXXX) Sensivity mV/C (‘MV.V ’) 2.0000 Nominal weight(‘LoAd’) 200000 Excitaon voltage (‘V.Exc’) 10 Vdc (‘10’) Advanced conguraon (‘AdVc’) Auto-tare (‘Aut.t’) Acvaon value(‘SEt’) 10 Stability band (‘bAnd’) 0 (disabled) Stability me (‘tIME’) 0.0 (disabled) Maximum tare (‘MAX.t’) 999999 Scale factor (‘ScL.F’) Mulplier (‘MuLt’) 1 Divider(‘dIV’) 1 Stock units (‘Stck’) 0 (disabled) Mode (‘ModE’) standard (‘Std’) Alarms 1,2 and 3 (‘ALr.1’, ‘ALr.2’, ‘ALr.3’) Acve (‘Act’) o (disabled) Type (‘tYPE’) maximum (‘MAX’) Setpoint (‘SEt’) 1000 Hysteresis (‘hYSt’) 0 counts Acvaon delay (‘dEL.0’) 0.0 seconds Deacvaon delay (‘dEL.1’) 0.0 seconds Stability (‘StbL’) Stability band (‘bAnd’) 10 counts Stability me (‘tIME’) 0.0 (disabled) Setpoint 2 (‘SEt.2’) o (disabled) Inverted relay (‘r.InV’) o Locked alarms (‘A.LcK’) o Display (‘dISP’) Fixed digits (‘FIX.d’) no xed digits (‘------’) Average lter(‘AVr’) 0 (disabled) Steps (‘StEP’) 1 Le zeros (‘LZEr’) o Memory of maximum (‘MAX’) -199999 Memory of minimum (‘MIn’) 999999 Rear controls (‘r.ctr’) all ‘o’ Key LE (‘K.LE’) Tare on Alarm unlock o Stock units o Key UP (‘K.uP’) all ‘o’ On power up Delay 0 Tare o Tools Password (‘PASS’) o Reset ‘inial conf.’(‘F.Ini’) o Brightness (‘LIGh’) 3

1.15 Messages and errors

Error messages are informed ashing on display.

Messages and errors

‘d.udr’ ‘d.oVr’

‘Err.0’

‘Err.1’

‘Err.2’

‘Err.6’

‘Err.8’

‘----’

Table 6 - Messages and error codes

display underrange (‘d.udr’) / overrange (‘d.ovr’). The display is already reading the minimum / maximum value possible (-199999 / 999999).

incorrect scaling (vercal slope)

incorrect password.

when accessing an ‘oPt.X’ menu entry, there is no recognize module installed.

in ‘stock units’ mode, weight value is 0 and can not be assigned to a quanty of units.

over current at the excitaon voltage.

requested reading is not accessible (reading of units with the ‘stock units’ mode disabled).

Page 28

DPS20

Load cell panel meter and controller

1.16 Praccal cases

Instruction Manual

1.16.1 Normal case

Case for 1 load cell, powered from the instrument, with power 10 Vdc, nominal weight 100 Kg and 2 mV/V sensibility.

• Connect the load cell to the instrument (see secon 1.8).

•

Congure the ‘theorecal conguraon of the load

cell’ (see secon 1.12.2).

•

Apply the ‘empirical conguraon of the load cell’

(see secon 1.12.2).

•

Congure the ‘system zero’ (see secon 1.12.2).

Depending on the specicaons of your load cell, you may need to apply a ‘tare’ each me that the weight is removed from the load cell. See at secon 1.11 the dier- ent opons available to acvate the ‘tare’ funcon.

1.16.2 Load cell with external power

Case for 1 load cell, with external power.

•

Connect the load cell normally, and do not connect

‘Vexc+’. Connect ‘Sense+’ and ‘Sense-’ to the load cell. ‘Vexc-’ must be connected to ‘Sense-’. See Figure 9.

•

Congure the ‘theorecal conguraon of the load cell’ (see secon 1.12.2). The value assigned to Vexc does not aect the measure.

•

Apply the ‘empirical conguraon of the load cell’

(see secon 1.12.2).

•

Congure the ‘system zero’ (see secon 1.12.2).

1.16.3 Connecons with a juncon box

A ‘juncon box’ for load cells has internal electronics that can modify the ‘signal / weight’ re-

laon provided to the instrument. Check the

manufacturer documentaon of the juncon box.

Case for 4 load cells connected to a ‘juncon box’. It is assumed that the ‘juncon box’ is used as a simple ‘connecons box’. All 4 load cells are the same type of load cell, with nominal weight of 100 Kg and 2 mV/V sensibility.

•

Connect the 4 load cells to the ‘juncon box’. Connect the instrument to the ‘juncon box’ using 4 or 6 wires, as indicated in the ‘juncon box’ documentaon. If 4 wires ‘juncon box’ is used, see secon 1.8.1 to connect the ‘sense’ wires not used (‘sense’ wires must connected).

•

Congure the ‘theorecal conguraon of the load

cell’ (see secon 1.12.2). Take note that the sensivity of the system remains the same (2 mV/V) and the nominal weight of the system is the addion of the nominal weight of each cell (4 x 100 Kg = 400 Kg)

•

Apply the ‘empirical conguraon of the load cell’

(see secon 1.12.2).

•

Congure the ‘system zero’ (see secon 1.12.2).

1234567

Vexc+

Sense+

Signal+ Signal-

Sense-

Vexc-

Figure 9 - Connecons for external power

Vexc+

external

1234567

Juncon box

(connecons box)

Figure 10 - Example for 4 load cells connecon through a ‘juncon box’ or ‘connecons box’.

Page 29

DPS20

Load cell panel meter and controller

1.16 Praccal cases (cont.)

Instruction Manual

1.16.4 Connecons with 3 or 4 load cells

Using 3 load cells is the opmal way to distribute the weight on a plane, although it is common to work with 4 load cells, in applicaons with tanks, hoppers and similar.

When working with mulple load cells, the opmal connecon is the one that makes the wires of the cell converge in the same central area, so that all the cells are at the same ‘electrical distance’ from the meter.

Use the same type load cell (for example, load cells with nominal load of 100 Kg and sensivity of 2 mV/V) and connect the wires to the central area as indicated below. Congure the instrument as indicates in this manual, assuming that :

•

the sensivity of the system remains the same (2 mV/V)

•

the nominal weight of the system is the addion of the nominal weight of each cell (3 x 100 Kg = 300 Kg for 3 cells or 4 x 100 Kg = 400 Kg for 4 cells)

•

the ‘sense’ wires are carried to the central zone together with the Vexc wires, but are not propagated to each individual cell. If you do not want to use the ‘sense’ wires, see secon 1.8.1.

1234567

Vexc+

Sense+

Signal+

Signal-

Sense-

Vexc-

1.16.5 Measuring mV at the laboratory

If you wish to congure the instrument to measure a millivolt generated signal at the laboratory, there is a special conguraon to apply. Dierent from the load cell, the millivolt generator is not a dierenal system, and does not need excitaon voltage.

•

Connect the instrument to the millivolt meter (see Figure 13). Add 2 resistances of 10 KOhm to connect the ‘Vexc’ terminals to the common of the signal generator.

•

Inside the ‘conguraon menu’, select the ‘Vexc’ parameter to ‘Lab’ (see secon 1.12.2). This value deacvates the raometric measurement and acvates the direct millivolt measurement.

•

At the addional parameters at the ‘theorecal conguraon of the load cell’ (see secon 1.12.2) assign the desired reading and the mV/V parameter. Note that values of 1 mV/V, 2 mV/V and 3 mV/V will acvate a full scale range of 10 mV, 20 mV and 30 mV respecvely.

•

Do not apply the ‘empirical conguraon of the load

cell’ (see secon 1.12.2). Applying this characterizaon to the signal generator will only generate a reducon in the measurement accuracy.

•

Congure the ‘system zero’ (see secon 1.12.2). This step is needed for a correct mV measurement. Generate 0 mV and ‘assign the system zero’.

To reduce leak currents that can aect the labo-

ratory measurement:

1. if the millivolt generator is powered from the mains network, use an isolator transformer to power the generator

Figure 11 - Connecon example with 3 load cells.

1234567

Vexc+

Sense+

Signal+

Signal-

Sense-

Vexc-

Figure 12 - Connecon example with 4 load cells.

2. if the instrument is powered from the mains network, use a separate isolator transformer to power the instrument

1234567

Vexc+

Sense+

Signal+

Signal-

Sense-

Vexc-

Figure 13 - Connecons for ‘laboratory’ mode

10 KOhm

mV Generator

Page 30

DPS20

Load cell panel meter and controller

1.17 To access the instrument

To open the housing and access the internal circuits, use a at screwdriver to unlock clips ‘D’, ‘C’, ‘B’ and ‘A’, in this order. Remove the front lter. Let the inside of the instrument slide out of the housing.

To reinsert the instrument make sure that all modules are correctly connected to the pins on the display module. Place all the set into the housing, assuring that the modules correctly t into the internal guiding slides of the housing. Once introduced, place again the front lter at corner ‘X’, and then insert clips ‘A’, ‘B’, ‘C’ and ‘D’, in this order.

Observe precauons for handling ESD (electrostac discharge) sensive devices

Instruction Manual

Risk of electric shock. Removing the front cover will grant access to the internal circuits. Disconnect the input signal to prevent electric shock to the operator. Operaon must be performed by qualied personnel only.

1.18 Modular architecture

Series M panel meter are designed based on a modular architecture. This modularity allows to replacement, change or add any of the internal modules conforming the instrument.

Frontal lter Display module Oponal modules

Opt.2

Opt.1

Opt.3

Input signal module

Below is a graphical explanaon of the locaon of each module.

See secon 2 for a list of oponal modules available.

Power module

Housing

How to Install in a panel

1. Remove the 2 blue plasc tabs from each side of the unit.

2. Insert instrument from the front of panel into panel cut out.

3. Re-aach the 2 blue plasc tabs by sliding each one into the track opening on each side and push unl the tabs grab onto the notches unl snug onto the back of panel.

If needed use a at screw driver to push the tabs strongly like in the image (A).

To uninstall the instrument, just place the screw driver and turn it between the box and the tab to ungrab the tabs (B).

(1.74)

(3.63)

Panel cut-out

(inch)

Page 31

DPS20

Load cell panel meter and controller

Instruction Manual

1.19 Precauons on installaon

Risk of electrical shock. Instrument terminals can be connected to dangerous voltage.

Instrument protected with double isolaon. No earth connecon required.

Instrument conforms to CE rules and regulaons.

This instrument has been designed and veried conforming to the 61010-1 CE Security Regulaon, for industrial applicaons.

Installaon of this instrument must be performed by qualied personnel only. This manual contains the appropriate informa on for the installaon. Using the instrument in ways not specied by the manufacturer may lead to a reducon of the specied protecon level. Disconnect the instrument from power before starng any maintenance and / or installaon acon.

The instrument does not have a general switch and will start operaon as soon as power is connected. The instrument does not have protecon fuse, the fuse must be added during instal laon.

The instrument is designed to be panel mounted. An appropri ate venlaon of the instrument must be assured. Do not expose the instrument to excess of humidity. Maintain clean by using a humid rag and do NOT use abrasive products such as alcohols, solvents, etc.

General recommendaons for electrical installaons apply, and for proper funconality we recommend : if possible, install the instrument far from electrical noise or magnec eld genera tors such as power relays, electrical motors, speed variators, ... If possible, do not install along the same conduits power cables (power, motor controllers, electrovalves, ...) together with signal and/or control cables.

Before proceeding to the power connecon, verify that the volt age level available matches the power levels indicated in the label on the instrument.

1.21 CE declaraon of conformity

Product DPS20 Series

The manufacturer declares that the instruments indicated comply with the direcves and rules indicated below.

Electromagnec compability direcve 2014/30/EU Low voltage direcve 2014/65/EU Direcve ROHS 2011/65/EU

Security rules EN-61010-1

Instrument Fixed Permanently connected Degree of polluon 1 and 2 (without condensaon) Isolaon Double

Electromagnec compability rules

EM environment Industrial

Immunity levels

EN-61000-4-2 By contact ±4 KV Criteria B By air ±8 KV Criteria B

EN-61000-4-3 Criteria A

*use shielded cable for signal and power lines to assure compliance with the rule.

EN-61000-4-4 On AC power lines: ±2 KV Criteria B On DC power lines: ±2 KV Criteria B On signal lines : ±1 KV Criteria B

EN-61000-4-5

EN-61000-4-6 Criteria A

*maintain signal and control lines below 3 meter length to assure compliance with the rule.

EN-61000-4-8 30 A/m a 50/60 Hz Criteria A

EN-61000-4-11 40 % 10 cycles Criteria A 70 % 25 cycles Criteria B 0 % 250 cycles Criteria B

Emission levels

CISPR 11 Instrument Class A, Group 1 Criteria A

EN-61326-1

Between AC power lines ±1 KV Between DC power lines DC ±0.5 KV

0 % 1 cycle Criteria A

Criteria A

In case of re, disconnect the instrument from the power line, re alarm according to local rules, disconnect the air condion ing, aack re with carbonic snow, never with water.

1.20 Warranty

This instrument is warranted against all manufacturing defects for a period of 24 months, as requested by the European legislaon. This warranty does not apply in case of misuse or accident, and the scope of the warranty is limited to repair of the instrument, not being the manufacturer responsible for addional damages or addional costs. Within the warranty period and aer examinaon by the manufacturer, the unit will be repaired or substuted when found to be defecve.

According to direcve 2012/19/EU, electronic equipment must be recycled in a selecve and controlled way at the end of its useful life.

Page 32

DPS20

Load cell panel meter and controller

Instruction Manual

2. Output and control modules

2.1 Módules R1, T1 and SSR

The R1, T1 and SSR modules provides 1 relay output, 1 transistor output or 1 SSR drive output, to install in DPS20 digital panel meters, up to a maximum of 3 modules in a single meter.

Conguraon is performed from the frontal keypad of the meter, by seng the parameters at the alarms conguraon menu (‘ALr.1’, ‘ALr.2’ or ‘ALr.3’ depending on the posion the module is installed). The menu allows to congure the setpoint, hysteresis, independent ac-

Opon R1

Output type relay

Relay type

Maximum current 8 A (resisve load)

Maximum voltage 250 Vac connuous

Isolaon 3500 Ve

Type of terminal plug-in screw terminal pitch 5.08 mm

Installaon allowed at ‘Opt.1’, ‘Opt.2’, ‘ Opt.3’

3 contact relay (NC, NO, common)

Module R1 - Relay output

vaon and deacvaon delays, and a second setpoint to create alarm windows.

Modules R1, T1 and SSR are isolated against all other instrument circuits, and isolated between them.

Modules R1, T1 and SSR can be ordered pre-installed into a DPS20 digital panel meter, or standalone for delayed installaon, as they do not require soldering or special conguraon.

Module Output schemacs and connecons

‘com’ (‘A’)

‘NC’ (‘C’)

‘NO’ (‘B’)

Schemac for R1 output

Opon T1

Output type transistor

Maximum voltage 35 Vdc

Maximum current 50 mA

Isolaon 3500 Ve

Type of terminal plug-in screw terminal pitch 5.08 mm

Installaon allowed at ‘Opt.1’, ‘Opt.2’, ‘ Opt.3’

Opon SSR

Output type to control a SSR relay

Output voltage +15 Vdc

Maximum current 45 mA

Isolaon 1000 Vdc

Type of terminal plug-in screw terminal pitch 5.08 mm

Installaon allowed at ‘Opt.1’, ‘Opt.2’, ‘ Opt.3’

Opt.1

A B C

Opt.2

A B C

Module T1 - Transistor output

Module SSR - SSR drive out

put

Table 7 - Connecons

‘B’

‘A’

Schemac for T1 output

+15 Vdc ‘C’

‘B’

‘A’

Schemac for SSR drive output

SSR relay

Opt.3

A B C

Signal

Rear view DPS20

Power

Page 33

DPS20

Load cell panel meter and controller

2.2 Module AO

Instruction Manual

Module AO provides 1 analog output congurable as 4/20 mA or 0/10 Vdc, to install in DPS20 digital panel meters.

Conguraon is performed from the frontal keypad of the meter, by seng the parameters at the opons conguraon menu (‘Opt.1’, ‘Opt.2’ or ‘Opt.3’ depending on the posion the module is installed).

The output signal is proporonal to the instrument reading, and it can be fully scaled with direct (posive) or inverted (negave) slopes. The mA output can be con-

Opon AO

Output type analog output

Output signals 4/20

4/20 0/10 Vdc

Max. signal output 22 Min. signal output 0 mA, -50 mVdc

Scaling related to the instruments reading direct or inverse slope

Vexc (terminal A) +13.8 protected against short circuit

Load impedances ≤350

Accuracy (at 25

Thermal stability 60 50 ppm/ºC in Vdc mode

Step response <75 (0% to 99% signal)

Isolaon 1000 Vdc

Warm-up 15 minutes

Type of terminal plug-in screw terminal

pitch 5.08

Installaon allowed at ‘Opt.1’, ‘Opt.2’, ‘Opt.3’

ºC) <0.1 % FS

mA acve mA passive

mA, 10.5 Vdc

Vdc ± 0.4 Vdc (max. 25 mA)

Ohms (in 4/20 mA acve)

≤800 Ohms (in 4/20 mA passive) (with a

24 Vdc external Vexc) (maximum 27 Vdc between terminals ‘B’ and ‘C’)

≥10 KOhms (in 0/10 Vdc)

ppm/ºC in mA mode

mSeconds + meter step response

gured as an acve loop (the instrument provides the excitaon for the loop ) or as a passive loop (the loop is externally powered).

A maximum of 1 analog output module can be installed in a single instrument. The analog output is

isolated from all other circuits.

Modules AO can be ordered pre-installed into a DPS20 digital panel meter, or standalone for delayed installaon, as they do not require soldering or special conguraon.

Module Connecons

Terminal A Vexc Terminal B Signal (mA or Vdc) Terminal C GND

Jumper M closed for ‘mA’ Jumper V closed for ‘Vdc’

Module AO - Analog output

Table 8 - Connecon terminals

Output 4/20 mA acve

A B C

M V

The current loop is powered from the ‘AO’ module

Jumper ‘M’ closed

Signal

Vexc.

Output 4/20 mA passive

A B C

M V

The current loop is powered from an external equipment

Jumper ‘M’ closed

Signal-

Signal+

Opt.3

A B C

Opt.1

A B C

MV MV

Signal

Rear view DPS20

Opt.2

A B C

Power

Output 0/10 Vdc

M V

Jumper ‘V’ closed

Table 9 - Connecons for each output mode

A B C

Com.

Signal

Page 34

DPS20

Load cell panel meter and controller

2.2.1 Conguraon menu

Instruction Manual

Congure at menu ‘Mode’ (‘ModE’) the output signal range to ‘4/20 mA’ (‘mA’) or ‘0/10 Vdc‘ (‘Vdc’). Posion for jumpers ‘V’ and ‘M’ must be according to the range selected.

At menu ‘Scaling’ (‘ScAL’) congure the values that dene the two points (‘high’ and ‘low’) of the ‘signal-reading’ slope:

• the lower slope point, dened by ‘Display low’ (‘d.Lo’) and ‘Output low’ (‘Ao.Lo’)

• the higher slope point, dened by ‘Display high’ (‘d.hI’) and ‘Output high’ (‘Ao.hI’)

Analog output values are shown with ‘XX.XX’ format, acceptable values are ‘0.00’ to ‘10.00’ Vdc for voltage, and ‘0.00’ to ‘20.00’ mA for current.

Reading

100.0

4 mA

-50.0

‘d.Lo’=‘-50.0’

Example - analog output in 4/20 mA, associated to a reading of -50.0 to 100.0

‘d.hI’=‘100.0’

‘Ao.hI’=‘20.00’

‘Ao.Lo’=‘4.00’

Analog output

Mode

Scaling

‘On error’

Factory

conguraon

Version

Mode 4/20 mA

Mode 0/10 Vdc

Display low

Output low

Display high

Output high

in case of error, ‘to_h’ to drive output to high level, ‘to_L’ to drive output to low level

select ‘yES’ to reload the default factory conguraon

2.2.2 Error codes

‘Er.34’ output signal congured to value lower than 0 Vdc or 0 mA

‘Er.35’ output signal congured to a value higher than 10 Vdc or 20 mA

‘Er.36’ congured slope points are not acceptable, such as : ‘d.Hi’=’d.Lo’

‘Ao.Hi’=’Ao.Lo’

(‘Ao.Hi’-’Ao.Lo’)>(’d.Hi’-’d.Lo’)

2.2.3 Factory conguraon

Mode ‘mA’ Scaling Display Low 0 Output Low 4.00 [mA] Display High 9999 Output High 20.00 [mA]

On error to high level(‘to_h’)’

Page 35

DPS20

Load cell panel meter and controller

2.3 Module RTU

Instruction Manual

Module RTU provides 1 Modbus RTU communicaons port, to install in DPS20 digital panel meters. Enables protocol funcon ‘4’ (‘Read Input Registers’) to access the instrument registers (reading value, alarm status, memory of maximum and minimum, setpoint values, ...).

Protocol conguraon is performed from the frontal keypad of the meter, by seng the parameters at the opons

Opon RTU

Output type Modbus RTU communicaon port

Funcon implemented 4 (Read_Input_Registers)

Addresses 01 to 247

Excepon codes see secon

Registers see secon Bus RS-485

speed 57.6 Kbps to 600 bps Data format 8n1 (standard), 8o1, 8n2, 8e1 bus terminator not included Isolaon 1000 Vdc Conguraon 3 buon front keypad Temperature operaon from 0 to 50 ºC storage from -20 to +70 ºC Factory conguraon ‘Address 1’ ‘Speed 19.2 Kbps’ ‘Format 8n1’ ‘Decimal point Auto’

Installaon allowed at ‘Opt.1’, ‘Opt.2’, ‘Opt.3’

1.9.3

conguraon menu (‘Opt.1’, ‘Opt.2’ or ‘Opt.3’ depending on the posion the module is installed).

Up to a maximum of 3 RTU modules can be installed in a single instrument, all modules isolated between them and isolated from all other circuits.

Modules RTU can be ordered pre-installed into a DPS20 digital panel meter, or standalone for delayed installaon, as they do not require soldering or special conguraon.

Module Connecons

Terminal B B signal from RS-485 bus Terminal A A signal from RS-485 bus

Terminal G

Module RTU - Modbus RTU

Table 11 - Connecon terminals

Opt.3

B A G

Opt.1

B A G

Signal

GND

Opt.2

B A G

Power

Rear view DPS20

2.3.1 Accessible registers

and S

0 DISPLAY1_L

1 DISPLAY1_H 16 bits

2 DECIMALS1 3 MAXMEM_L 4 MAXMEM_H 16 bits 5 MINMEM_L 6 MINMEM_H 16 bits

Display value

Decimals on display

Memory of maximum

Memory of mini-

mum 7 SETPOINT1_L 8 SETPOINT1_H 16 bits

Setpoint 1 value

9 SETPOINT2_L

10 SETPOINT2_H 16 bits

Setpoint 2 value

11 SETPOINT3_L 12 SETPOINT3_H 16 bits

Setpoint 3 value

16 bits

16 bits 16 bits

16 bits

same as display

every 30 seconds

every 2 seconds

999999 to

-199999

0 to 6

999999 to

-199999

999999 to

-199999

999999 to

-199999

999999 to

-199999

999999 to

-199999

9999 to -1999

0 to 4

9999 to -1999

9999 to -1999*

13 STATUS

Alarm status

Instrument status

14 a 16 Reserved

Table 10 - Registers accessible via MODBUS-RTU. All registers codied as binary numbers. Negave values are codied in two’s complement.

Reserved

16 bits

16 x 3 bits

same as display

bit 0...7 alarm status bit 8...16 instrument status

Not accessible

Page 36

DPS20

Load cell panel meter and controller

2.3.2 Conguraon menu

AddressConguraon

1 to 247

Instruction Manual

Congure at menu ‘Conguraon’ (‘rtu’), the address val- ue between ‘1’ and ‘247’ at parameter ‘Address’ (‘Addr’), bus speed in kbps at parameter ‘Speed’ (‘bAud’) and data format at parameter ‘Format’ (‘bItS’).

Tools

Speed (kbps)

Format

57.6 Kbps ... ... to 600 bps

Special tools are grouped inside the ‘Tools’ (‘TooL’) menu.

• the ‘Decimal point’ (‘dP’) menu is provided for com-

pability with ancient hardware that does not support decimal point retransmission. By default, select ‘Auto- mac’ (‘Auto’). If your instrument does nos transmit the decimal

point posion, select ‘Manual’ (‘MAnL’) and x the posion of the decimal point manually.

• at the

default factory conguraon for the instrument.

the ‘Version’ (‘VEr’) menu informs of the current rmware

‘Factory reset’ (‘FAct’) menu, select ‘yes’ to load the

version installed in the module.

2.3.3 Excepon codes

8 bits, no parity, 1 stop

8 bits, even parity, 1 stop

8 bits, odd parity, 1 stop

8 bits, no parity, 2 stop

AutomacDecimal point

The Modbus RTU protocol denes the following scenarios when a ‘Master’ is sending a frame to a ‘Slave’:

• the ‘Slave’ device receives the frame correctly and replies with the requested data

• the ‘Slave’ devices detects a CRC error, parity error, or other. and discards the frame without generang a reply frame. The ‘Master’ will detect a ‘TIMEOUT’ condion due to the absence of reply.

• the ‘Slave’ device receives the frame correctly, but replies with an ‘EXCEPTION_CODE’ as it can not process the funcon or register requested.

The ‘EXCEPTION_CODES’ congured in the RTU module are :

Factory

conguraon

Version

Manual

Move with LE

Excepon

Name Descripon

code

Table 12 - Excepon codes

ILLEGAL_FUNCTION

ILLEGAL_DATA_ADDRESS

Requested funcon is not supported

Requested register is not supported

Page 37

DPS20

Load cell panel meter and controller

2.3.4 Descripon for Modbus RTU registers

Instruction Manual

Contains the display value of the instrument, codied in two registers of 16 bits each. Possible values are from 999999 to -199999. Decimal point posion is codied on register R2.

Example R0=FBF1 (hex) and R1=0009 (hex)

Reading value = 654321

Contains the number of decimals of the display, codied in a single register of 16 bits. Possible values are from 0 to 6.

Example R2=0002 (hex)

Number of decimals = 2 = 6543.21

Contains the memory of maximum reading of the instrument, codied in two registers of 16 bits each. Possible values are from 999999 to -199999. Decimal point posion is codied on register R2.

Example - same example as in R0 and R1 but accessing to R3 and R4.

Contains the memory of minimum reading of the instrument, codied in two registers of 16 bits each. Possible values are from 999999 to -199999. Decimal point posion is codied on register R2.

Example - same example as in R0 and R1 but accessing to R5 and R6.

Contains the setpoint value of alarm 1, codied in two registers of 16 bits each. Possible values are from 999999 to -199999. Decimal point posion is codied on register R2.

Example - same example as in R0 and R1 but accessing to R7 and R8.

Contains the setpoint value of alarm 2, codied in two registers of 16 bits each. Possible values are from 999999 to -199999. Decimal point posion is codied on register R2.

Example - same example as in R0 and R1 but accessing to R9 and R10.

Contains the setpoint value of alarm 3, codied in two registers of 16 bits each. Possible values are from 999999 to -199999. Decimal point posion is codied on register R2.

Example - same example as in R0 and R1 but accessing to R11 and R12.

Informaon bit-by-bit, for the alarm status (on / o) and instrument status. See below for a descripon.

Bit 0 Alarm 1 status (0 = inacve, 1 = acve) Bit 1 Alarm 2 status (0 = inacve, 1 = acve) Bit 2 Alarm 3 status (0 = inacve, 1 = acve) Bit 3 a 7 Reserved Bit 8 Display overrange Bit 9 Display underrange Bit 10 Lost communicaon with the main processor Bit 11 to 15 Reserved

Registers R14, R15 and R16

Reserved

Page 38

DPS20

Load cell panel meter and controller

2.4 Module S4

Instruction Manual

Module S4 provides 1 RS-485 ASCII communicaons port, to install in DPS20 digital panel meters. ASCII protocol with ‘master’ - ‘slave’ architecture. Addressable up to 31 modules. Frames codied in representable ASCII characters (codes 32 to 255), directly visible using ‘hyperterminal’ or similar programs.

Instrument registers are accessible through the RS-485 ASCII port (reading value, alarm status, memory of maximum and minimum, setpoint values, ...).

Protocol conguraon is performed from the frontal key-

Opon S4

Output type RS-485 ASCII communicaon port Bus RS-485

Speed 57.6 Data format 8n1 (standard), 8o1, 8n2, 8e1 Protocol ASCII Architecture ‘master - slave’ Addresses 01 to 31 ‘Broadcast’ address 128

Registers see secon Isolaon 1000 Vdc

Conguraon 3 buon front keypad Temperature operaon from 0 to 50 ºC

storage from -20 to +70 ºC Installaon allowed at ‘Opt.1’, ‘Opt.2’, ‘Opt.3’

Kbps to 600 bps

2.4.1

pad of the meter, by seng the parameters at the opons conguraon menu (‘Opt.1’, ‘Opt.2’ or ‘Opt.3’ depending on the posion the module is installed).

Up to a maximum of 3 S4 modules can be installed in a single instrument, all modules isolated between them and isolated from all other circuits.

Modules S4 can be ordered pre-installed into a DPS20 digital panel meter, or standalone for delayed installaon, as they do not require soldering or special conguraon.

Module Connecons

Terminal B B signal from RS-485 bus Terminal A A signal from RS-485 bus Terminal G GND

Module S4 - RS-485 ASCII

Table 13 - Connecon terminals

Opt.1

B A G

Opt.2

B A G

2.4.1 Accessible registers

Display values (DISPLAY1, MAXMEM, MINMEM, AL1, AL2, AL3) are codied with a minimum of 6 digits (le zeros are added if necessary), polarity and decimal point.

0 DISPLAY1 Display1 value 1 MAXMEM Memory of maximum 2 MINMEM Memory of minimum 3 AL1 Setpoint 1 value 4 AL2 Setpoint 2 value 5 AL3 Setpoint 3 value 6 STATUS Alarm status

Table 14 - Accessible registers for ASCII protocol.

Register 0 - DISPLAY1 Contains the display value of the instrument, in ASCII code, including polarity (posive / negave) and decimal point. Example 1 R0=’+’ ‘0’ ’6’ ‘5’ ‘4’ ‘3’ ‘.’ ‘2’ Display value = 6543.2 Example 2 R0=’-’ ‘0’ ‘0’ ‘0’ ‘4’ ‘.’ ‘5’ ‘2’ Display value = -4.52

Opt.3

B A G

Signal

Rear view DPS20

Register 1 - MAXMEM Contains the value for memory of maximum, in ASCII code, including polarity (posive / negave) and decimal point.

Register 2 - MINMEM Contains the value for memory of minimum, in ASCII code, including polarity (posive / negave) and decimal point.

Register 3 - AL1 Contains the value for alarm 1 setpoint, in ASCII code, including polarity (posive / negave) and decimal point.

Register 4 - AL2 Contains the value for alarm 2 setpoint, in ASCII code, including polarity (posive / negave) and decimal point.

Register 5 - AL3 Contains the value for alarm 3 setpoint, in ASCII code, including polarity (posive / negave) and decimal point.

Bit 0 Alarm 1 status (0 = inacve, 1 = acve) Bit 1 Alarm 2 status (0 = inacve, 1 = acve) Bit 2 Alarm 3 status (0 = inacve, 1 = acve) Bit 3 to 15 Reserved

Power

Page 39

DPS20

Load cell panel meter and controller

2.4.2 Conguraon menu

Conguraon

ASCII

Mode

Address

Speed (kbps)

Format

1 to 31

‘Slave’ mode

‘Master’ mode

8 bits, no parity, 1 stop

8 bits, even parity, 1 stop

8 bits, odd parity, 1 stop

8 bits, no parity, 2 stop

Instruction Manual

At menu ‘Conguraon ASCII’ (‘AScI’), congure the instrument at parameter ‘Mode’ (‘ModE’) to work as ‘slave’ or ‘master’, at parameter ‘Address’ (‘Addr’) set the address value from ‘1’ to ‘31’, set the bus speed in kbps at parameter ‘Speed’ (‘bAud’) and set the data format at parameter ‘Format’ (‘bItS’).

When working as ‘master’, the instrument connuously transmits the display value data frame. The local module address is ‘0’. Congure at menu ‘Conguraon Master’ (‘cnF.M’) the ‘Desnaon address’ (‘d.Add’) parameter from ‘1’ to ‘31’ or use value ‘128’ for a broadcast message. At parameter ‘Frequency’ (‘FrEq’) select the how oen the frame with the reading value will be transmied.

Special tools are grouped inside the ‘Tools’ (‘TooL’) menu.

• the ‘Decimal point’ (‘dP’) menu is provided for compability with ancient hardware that does not support decimal point retransmission. By default, select ‘Automac’ (‘Auto’). If your instrument does nos transmit the decimal point posion, select ‘Manual’ (‘MAnL’) and x the posion of the decimal point manually.

•the ‘Legacy mode’ (‘LEG’) parameter is provided to maintain compability with instruments with older communicaon protocols. Select ‘on’ to acvate this mode.

• the ‘Answer delay’ (‘AnS.d’) parameter applies only to ‘Slave’ mode. The local module delays the answer frame. Congure for applicaons where the ‘Master’ needs addional me to switch between ‘transmit’ and ‘receive’ modes. Enter a numeric value between ‘0’ and ‘1000’ mSeconds.

• at the ‘Factory reset’ (‘FAct’) menu, select ‘yes’ to load the default factory conguraon for the instrument.

the ‘Version’ (‘VEr’) menu informs of the current rmware version installed in the module.

Conguraon

‘Master’

Tools

Desnaon

address

Frequency

Decimal point

Legacy mode

Answer delay

Factory

conguraon

1 to 31 128 for ‘broadcast’

Automac

Manual

use key ‘LE’ to select

delay for answers, from 0 to 1000 mSec.

0.1 seconds

0.5 seconds 1 seconds 5 seconds

15 seconds 60 seconds

2.4.3 Factory conguraon

Conguraon ASCII Mode Slave Address 1 Speed (‘bAud’) 19.2 Kbps

Format (‘bItS’) 8n1

Conguraon ‘Master’ Desnaon address 31 Frequency 0.5 seconds Tools Decimal point Auto Legacy O Answer delay 0 mSeconds

Version

Page 40

DPS20

Load cell panel meter and controller

2.4.4 Frame types

Instruction Manual

The ASCII protocol denes the following frames:

• Frame ‘read’ (‘RD’). Id code 36. Request data frame. The requested register is indicated into the ‘REG’ byte (‘Header’ secon).

• Frame ‘answer’ (‘ANS’). Id code 37. Response frame to a request data frame. The requested register is indicated into the ‘REG’ byte’ (‘Header’ secon). Data of the requested register is indicated into data bytes ‘D0’ to ‘Dn’ (‘Data’ secon).

• Frame ‘error’ (‘ERR’). Id code 38. Response frame to a request data frame. Indicates that an error has occurred. Error code is codied

into the ‘REG’ byte (‘Header’ secon).

• Frame ‘ping’ (‘PING’). Id code 32. Used to conrm the existence of the remote instrument.

• Frame ‘pong’ (‘PONG’). Id code 33. Response to a ‘ping’ frame. It conrms the existence of the remote instrument.

2.4.5 Frame structure

Header Data Trail

STX ID RSV FROM TO REG RSV LONG D0 D1 ... Dn CRC ETX

2 x 32 x x x 32

0 1 2 3 4 5 6 7 8 9 ... n+7 n+8 n+9

Protocol frames have a structure made of ‘Header’, ‘Data’ and ‘Trail’.

Secon ‘Header’

Contains the start byte (‘STX’), the frame idener (‘ID’), the origin address (‘FROM’) and the desnaon address (‘TO’), the register id (‘REG’) and the length (‘LONG’) of the ‘Data’ secon.

Secon ‘Data’

Contains data for the requested register (‘REG’).

n+1 [data] x 3

Secon ‘Trail’

Contains the ‘CRC’ code and the end of frame byte (‘ETX’).

‘Real value’ and ‘Frame value’

To use representable ASCII values, the real values are codied before being sent into the frame. The following denions apply :

• ‘real value’ is the value of the eld without codicaon

• ‘frame value’ is the value of the eld, codied

Field Descripon Size Posion Real value Frame value

STX Start of frame 1 byte 0 does not apply 2

ID Frame type 1 byte 1 (see secon 2.4.4) real_value

RSV Reserved 1 byte 2 0 32

FROM Origin address 1 byte 3 0 (‘Master’) / 1 to 31 (‘Slave’) 32 + real_value

TO Desnaon address 1 byte 4 0 (‘Master’) / 1 to 31 (‘Slave’)

128 (‘broadcast’)

REG Register idencaon 1 byte 5 (see secon 2.4.1) 32 + real_value

RSV Reserved 1 byte 6 0 32

LONG Length of ‘Data’ secon 1 byte 7 n (between 0 and 32) 32 + real_value

D0 … Dn Data n bytes 8 to n+7 number 0 to 9

decimal point polarity (+/-)

CRC CRC calculaon 1 byte n+8 does not apply (see secon 1.19)

ETX End of frame 1 byte n+9 does not apply 3

Table 15 - Descripon of the bytes for the ASCII frame

32 + real_value

ASCII code of the number (48 to 57) ASCII code of decimal point (46) ASCII code of ‘+’ (43) ASCII code of ‘-’ (45)

2.4.6 Error codes

Frames ‘ERR’ contain within the ‘REG’ eld, the error code. Available error codes are :

error 1 unknown register

error 2 display overrange

error 3 display underrange

error 4 CRC error

error 5 internal error

Page 41

DPS20

Load cell panel meter and controller

2.4.7 Frame examples

Frames ‘RD’ (36) and ‘ANS’ (37)

Instruction Manual

Example - ‘Master’ (address ‘0’) requests the value of register ‘0’ (display value) to the ‘Slave’ at address ‘28’ (‘RD’ frame) and the ‘Slave’ replies to the ‘Master’ with a reply frame (‘ANS’ frame) containing the requested data (765.43).

Header Trail

STX ID RSV FROM TO REG RSV LONG CRC ETX

2 36 32 32 60 32 32 32 58 3

Start RD --- 0 28 0 --- 0 CRC Stop

Header Data Trail

STX ID RSV FROM TO REG RSV LONG D0 D1 D2 D3 D4 D5 D6 D7 CRC ETX

2 37 32 60 32 32 32 40 43 48 55 54 53 46 52 51 15 3

Start ANS --- 28 0 0 --- 8 +0765.43 CRC Stop

*Instruments with 4 digits also send reading values formaed with 6 digits : value -321.5 is transmied as -00321.5

Frames ‘ERR’ (38)

Example - ‘Slave’ at address ‘11’ replies to the ‘Master’ (address ‘0’) with an error frame (‘ERR’ frame) indicang that the requested register number is unknown (‘UNKNOWN_REGISTER’, error code ‘1’). The

Header Trail

STX ID RSV FROM TO REG RSV LONG CRC ETX

2 38 32 43 32 33 32 32 46 3

Start ERR --- 11 0 1 --- 0 CRC Stop

error code is codied into the ‘REG’ byte. For a list of error code see

secon

2.4.6.

Frames ‘PING’ (32) and ‘PONG’ (33)

Example - ‘Master’ (address ‘0’) requests conrmaon of existence to the ‘Slave’ at addrress ‘22’ (‘PING’ frame) and the ‘Slave’ replies to the ‘Master’ with a ‘PONG’ frame.

Header Trail

STX ID RSV FROM TO REG RSV LONG CRC ETX

2 32 32 32 54 32 32 32 52 3

Start Ping --- 0 22 0 --- 0 CRC Stop

Header Trail

STX ID RSV FROM TO REG RSV LONG CRC ETX

2 33 32 54 32 32 32 32 53 3

Start Pong --- 22 0 0 --- 0 CRC Stop

2.4.8 CRC calculaon

The ‘frame value’ for the CRC byte is calculated applying a XOR funcon to the ‘frame value’ (see secon 2.4.5) of all bytes in secons ‘Header’ and ‘Data’, from byte ‘0’ (‘STX’) to the last data byte (‘Dn’).

• if the calculated CRC value is lower than ‘32’, it is normalized by applying the ‘one’s complement’ funcon .

CRC0=STX ^ ID ^ RSV ^ FROM ^ TO ^ REG ^ RSV ^ LONG ^ D0 ^...^ Dn

• if (CRC0<32) -> CRC=!CRC0 (one’s complement funcon)

• if (CRC0>31) -> CRC=CRC0

//example of CRC calculaon in C language

int8 Calculate_CRC(int8 CRC_Posion)

{

int8 i,CRC=0;

for(i=0;c<CRC_Posion;c++)

{

crc=crc ^ frame[i];

}

if(crc<32) CRC=~CRC;

return(CRC);

}

Page 42

DPS20

Load cell panel meter and controller

2.5 Module S2

Module S2 provides 1 RS-232 ASCII communicaons port, to install in DPS20 digital panel meters. Protocol specicaons are the same as with module S4 (see secon 2.4), with only dierence that the physical bus is RS-232 instead of RS-485.

S2 modules allow for point-to-point communicaon over RS-232 and also allow for mulnode communicaon over RS-232 using a ‘Daisy-Chain’ type of connecon.

Terminals RX1 and TX1 are for connecon to the RS-232 bus. Terminals RX2 and TX2 are for RS-232 mulnode connecon. Frames received on RX1 with desnaon address dierent than the local instrument’s address, will be retransmied over the TX2 terminal. In a similar way, frames received from RX2 with desnaon address other than the local address, will be retransmied over TX1 terminal.

Up to a maximum of 3 S4 modules can be installed in a single instrument, all modules isolated between them and isolated from all other circuits.

Modules S2 can be ordered pre-installed into a DPS20 digital panel meter, or standalone for delayed installaon, as they do not require soldering or special conguraon.

Opon S2

Output type RS-232 ASCII communicaon port Bus RS-232

Speed 57.6 Kbps to 600 bps Data format 8n1 (standard), 8o1, 8n2, 8e1 Protocol ASCII Architecture ‘master - slave’ Addresses 01 to 31 ‘Broadcast’ address 128

Registers see secon Isolaon 1000 Vdc

Conguraon 3 buon front keypad Temperature operaon from 0 to 50 ºC

storage from -20 to +70 ºC Installaon allowed at ‘Opt.1’, ‘Opt.2’, ‘Opt.3’

2.4.1

Instruction Manual

Module Connecons

Terminal A Tx2 Terminal B Rx2 Terminal C Tx1 Terminal D Rx1 Terminal E GND

Module S2 - RS-232 ASCII

Table 16 - Connecon terminals

Opt.1

ABCDE

Opt.3

ABCDE

Signal

Rear view DPS20

Opt.2

ABCDE

Power

Page 43

DPS20

Load cell panel meter and controller

Instruction Manual

Page 44

DPS20

Load cell panel meter and controller

3. How to open and close

3.1 How to open the housing

A. Locate the clips

Locate the 4 clips (A B C D). Clips are covered by the front lter.

Clips can be seen when looking from the rear of the instrument, just below the front lter.

Instruction Manual

A.1

B D

A.2

D B

C A

A.3

B. How to unclip one clip

Place a at screw driver at the rst clip. Insert rmly unl the end of the clip space, and then turn gently the screwdriver clockwise approx. 45º (while sll pushing against the clip). The front lter will ‘move up’ and unclip itself. Clip is unclipped when the front lter corner moves slightly to the front.

B.1

B.2

B.3

Screw driver placed Screw driver turned

C. Repeat with all clips

Repeat for remaining 3 clips. All 4 clips are now unclipped.

Front lter is slightly moved to the front on each corner. It can now be removed by hand.

C.1 C.2

D B

C A

Unclipped

UnclippedClipped

C.3

Page 45

DPS20

Load cell panel meter and controller

Instruction Manual

3.2 How to close the housing

A. Locate the clips

Locate the 4 clips (A B C D) at the housing (image A.1) and the 4 mang clips at the lter (image A.2). With the instrument inside the housing, face the front lter against the housing (do not clip yet). Do not press the rear terminals with your hand, as the instrument would force the lter outwards.

A.1

D B

Front lter

Internal View

C A

A.3A.2

B. Fit corner ‘X’ and clip ‘A’

Fully insert corner ‘X’ into the housing. See at image B.2 that the lter is not yet clipped : only corner ‘X’ is completely ed. Corner ‘Y’ can be also ed or not ed (it is not important). With corner X ed and rmly pressed (it must remain ed), press clip ‘A’ and it will clip (you will hear a clear ‘snap’).

B.1

Corner ‘Y’ can be ed or not ed

B.3B.2

Corner ‘X’ ed

‘X’

Press ‘A’

Corner ‘X’ ed

C. Clip remaining clips ‘B’, ‘C’ & ‘D’

Sll press rmly corner ‘X’ unl all four clips are clipped. You can release your nger from clip ‘A’ as clip ‘A’ will not unclip once it is clipped. Press on clip ‘B’ unl it clips (you will hear a clear ‘snap’). Then press on clips ‘C’ and ‘D’ (you will hear a clear ‘snap’ on each case).

C.1

Press ‘B’

Corner ‘X’ ed

C.2 C.3

Press ‘D’

1st Press ‘C’

Corner ‘X’ ed

Page 46

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