Circutor DHB-402 User manual

INSTRUCTION MANUAL
(M045B01-03-21A)
Indicator for process signals,
temperature and resistance
DHB-402 DHB-424

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DHB-402 DHB-424
Instruction Manual

SAFETY PRECAUTIONS
DISCLAIMER
CIRCUTOR, SA reserves the right to make modifications to the device or the unit specifications set
out in this instruction manual without prior notice.
CIRCUTOR, SA on its web site, supplies its customers with the latest versions of the device specifica-
tions and the most updated manuals.
www.circutor.com
CIRCUTOR, recommends using the original cables and accessories that are supplied
with the device.
DANGER
Warns of a risk, which could result in personal injury or material damage.
ATTENTION
Indicates that special attention should be paid to a specific point.
Follow the warnings described in this manual with the symbols shown below.
If you must handle the unit for its installation, start-up or maintenance, the following should be
taken into consideration:
Incorrect handling or installation of the unit may result in injury to personnel as well as damage to the
unit. In particular, handling with voltages applied may result in electric shock, which may cause death
or serious injury to personnel. Defective installation or maintenance may also lead to the risk of fire.
Read the manual carefully prior to connecting the unit. Follow all installation and maintenance in-
structions throughout the unit’s working life. Pay special attention to the installation standards of the
National Electrical Code.
Refer to the instruction manual before using the unit
In this manual, if the instructions marked with this symbol are not respected or carried out correctly, it can result
in injury or damage to the unit and/or installations.
CIRCUTOR, SA reserves the right to modify features or the product manual without prior notification.
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Instruction Manual
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CONTENTS
SAFETY PRECAUTIONS .........................................................................................................................................................3
DISCLAIMER ..........................................................................................................................................................................3
CONTENTS.............................................................................................................................................................................4
REVISION LOG .......................................................................................................................................................................5
1. VERIFICATION UPON RECEPTION....................................................................................................................................6
2. PRODUCT DESCRIPTION .................................................................................................................................................6
3. UNIT INSTALLATION........................................................................................................................................................7
3.1.- PRELIMINARY RECOMMENDATIONS ........................................................................................................................7
3.2.- INSTALLATION .........................................................................................................................................................7
3.3.- UNIT TERMINALS.....................................................................................................................................................8
3.3.1.- LIST OF TERMINALS, DHB402 MODEL .........................................................................................................8
3.3.2.- LIST OF TERMINALS, DHB424 MODELS .......................................................................................................9
3.4.- CONNECTION DIAGRAM.........................................................................................................................................10
3.4.1.- CONNECTION OF THE STANDARD ANALOGUE SIGNALS..............................................................................10
3.4.2.- CONNECTION FOR MEASURING TEMPERATURE .........................................................................................10
4. OPERATION ....................................................................................................................................................................11
4.1.- MEASURING PARAMETERS.....................................................................................................................................11
4.2.- DISPLAY..................................................................................................................................................................11
4.3.- BUTTON FUNCTIONS ............................................................................................................................................. 12
4.4.- OPEN COLLECTOR OUTPUT, OC (DHB-424 model)................................................................................................ 13
4.5.- REGRESSION OF NON-LINEAR EQUATIONS .......................................................................................................... 13
4.6.- ALARMS................................................................................................................................................................. 14
4.7.- CONFIGURATION .................................................................................................................................................... 15
4.7.1.- INPUT PARAMETERS..................................................................................................................................... 17
4.7.2.- REGRESSION OF NONLINEAR EQUATIONS................................................................................................ 20
4.7.3.- DISPLAY.........................................................................................................................................................23
4.7.4. ALARM 1 .........................................................................................................................................................28
4.7.5. ALARM 2 .........................................................................................................................................................32
4.7.6. ALARM 3 .........................................................................................................................................................32
4.7.7. ALARM 4..........................................................................................................................................................33
4.7.8. OUTPUTS (DHB-424 model)...........................................................................................................................33
4.7.9. SERVICE......................................................................................................................................................... 38
4.8.- COMMUNICATIONS (DHB-424 model)...................................................................................................................42
4.8.1.- CONNECTIONS ..............................................................................................................................................42
4.8.2.- MODBUS PROTOCOL.....................................................................................................................................43
4.8.3.- MODBUS MEMORY MAP. ..............................................................................................................................43
5. TECHNICAL FEATURES..................................................................................................................................................54
6. MAINTENANCE AND TECHNICAL SERVICE ...................................................................................................................57
7. WARRANTY ....................................................................................................................................................................57
8. CE CERTIFICATE ........................................................................................................................................................... 58
APPENDIX A: DISPLAY MESSAGES.....................................................................................................................................59
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DHB-402 DHB-424
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REVISION LOG
Table 1: Revision log.
Date Revision Description
09/14 M045B01-03-14A Initial version
08/15 M045B01-03-15A Global revision
02/16 M045B01-03-16A Changes in the following sections:
3.3.1.- 3.3.2.- 4.6. - 5.
03/21 M045B01-03-21A Changes in the following sections:
4.7.1.1.
Note: The images of the units are solely for the purpose of illustration and may differ from the original
unit.
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Instruction Manual
DHB-402 DHB-424

1. VERIFICATION UPON RECEPTION
Check the following points when you receive the unit:
a) The unit meets the specifications described in your order.
b) The unit has not suffered any damage during transport.
c) Perform an external visual inspection of the unit prior to switching it on.
d) Check that it has been delivered with the following:
- An installation guide,
- Four retainers for rear attachment of the unit,
- 2 connection terminals.
- Labels with the measuring units.
If any problem is noticed upon reception, immediately contact the transport com-
pany and/or CIRCUTOR's after-sales service.
2. PRODUCT DESCRIPTION
The DHB-4xx is a programmable panel unit that measures: standard analogue signals sent by sensors,
temperature (RTD and Thermocouple), resistance, and current time.
There are 2 versions of the unit depending on the number of alarms and whether the unit has com-
munications.
DHB-402, with 2 alarm relays.
DHB-424, with 4 alarm relays, 2 analogue outputs and communications RS-485.
The unit features:
- 4 buttons that allow you to browse between the various screens and program the unit.
- Inputs to measure analogue voltage, current and temperature signals.
- LCD Display, which displays all the parameters.
- 2 alarm relays, fully programmable (DHB-402 model).
- 2 analogue outputs, fully programmable. (DHB-424 model).
- 4 alarm relays, fully programmable (DHB-424 model).
- RS-485 communications, MODBUS RTU©. (DHB-424 model).
-1 open collector output, NPN (DHB-424 model).
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3. UNIT INSTALLATION
3.1.- PRELIMINARY RECOMMENDATIONS
In order to use the unit safely, it is critical that individuals who handle it follow the safety
measures set out in the standards of the country where it is being used, use the person-
al protective equipment necessary, and pay attention to the various warnings indicated
in this instruction manual.
The DHB-4xx unit must be installed by authorised and qualified staff.
The power supply plug must be disconnected and measuring systems switched off before handling,
altering the connections or replacing the unit. It is dangerous to handle the unit while it is powered.
Also, it is critical to keep the cables in perfect condition to avoid accidents, personal injury and damage
to installations.
The manufacturer of the unit is not responsible for any damage resulting from failure by the user or
installer to heed the warnings and/or recommendations set out in this manual, nor for damage re-
sulting from the use of products or accessories that did not come with the unit or that were made by
other manufacturers.
If an anomaly or malfunction is detected in the unit, do not use the unit to take any measurements.
Inspect the work area before taking any measurements. Do not take measurements in dangerous
areas or where there is a risk of explosion.
Disconnect the unit from the power supply (unit and measuring system power supply)
before maintaining, repairing or handling the unit's connections.
Please contact the after-sales service if you suspect that there is an operational fault
in the unit.
3.2.- INSTALLATION
The unit is installed on a panel. The thickness should not exceed 6 mm. Drill panel at 92+0.6 x 45+0.6 mm.
Terminals, opening roofs or removing elements can expose parts that are hazardous to
the touch while the unit is powered. Do not use the unit until it is fully installed.
All the connections are located inside the electric panel. The unit must be installed on the panel from
the front. Attach the unit with the 4 brackets to the panel (Figure 1)
Cable cross-section for connections up to: 2.5 mm2.
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DHB-402 DHB-424

The unit must be connected to a power circuit protected by a circuit breaker switch or equivalent de-
vice located close to unit, marked accordingly, and easily accessed by the operator.
Figure 1: Unit installation and attachment.
3.3.- UNIT TERMINALS
3.3.1.- List of terminals, DHB-402 model
Table 2:List of terminals on the DHB-402.
Unit terminals
1 :10V +, Voltage input 9: AL1, Alarm 1 relay output (NO)
2: GND -, Ground voltage and current input 10: AL1, Alarm 1 relay output (Common)
3: 20mA +, Current input 11: AL2, Alarm 2 relay output (NO)
4: 60mV +, Thermocouple input 12: AL2,Alarm 2 relay output (Common)
5: 60mV -, Thermocouple input 13, 14: Not used.
6,7,8: Resistance-RTD probes 15, 16: Auxiliary power supply.
DHB-402
189 10 1112131415 16
Figure 2:Terminals of the DHB-402
Note: The input, output and power supply lines are galvanically separated from each other.
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3.3.2.- List of terminals, DHB-424 models
Table 3:List of terminals on the DHB-424
Unit terminals
1 :10V +, Voltage input 22: GND, for RS-485
2: GND -, Ground voltage and current input 23: 10V+, Analogue voltage output
3: 20mA +, Current input 24: 10V , Analogue voltage output
4: 60mV +, Thermocouple input 25: 20mA+, Analogue current output
5: 60mV -, Thermocouple input 26: 20mA, Analogue current output
6,7,8: Resistance-RTD probes 27: OC+, Open collector output (NPN)
9: AL1, Alarm 1 relay output (NO) 28: OC, Open collector output (NPN).
10: AL1, Alarm 1 relay output (Common) 29, 30 : Not used
11: AL2, Alarm 2 relay output (NO) 31: AL3, Alarm 3 relay output (Common)
12: AL2,Alarm 2 relay output (Common) 32: AL3, Alarm 3 relay output (NC)
13, 14: Not used. 33: AL3, Alarm 3 relay output (NO)
15, 16: Auxiliary power supply. 34: AL4, Alarm 4 relay output (Common)
20: B, RS-485 35: AL4, Alarm 4 relay output (NC)
21: A, RS-485 36: AL4, Alarm 4 relay output (NO)
DHB-402 / DHB-424
18
29 30 31 32 33 34 35 36
9 10 1112131415 16
Figure 3: Terminals of the DHB-424
Note: The input, output, power supply and RS-485 communications lines are galvanically separated
from each other.
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3.4.- CONNECTION DIAGRAM
3.4.1.- Connection of the standard analogue signals
DHB-402 / DHB-424
0 ...10V
1 8
0 ...20mA
GND
++ -
DHB-402 / DHB-424
1 8
+ -
60 mV
Figure 4: Connection of the standard signals, DHB-402 and DHB-424 models.
3.4.2.- Connection for measuring temperature
Thermocouple Resistance and RTD (2 wires) Resistance and RTD (3 wires)
DHB-402 / DHB-424
1 8
J, K, N, E, R, S Type
+ -
DHB-402 / DHB-424
1 8
R: 400 Ω , 4000 Ω
RTD : PT100, PT500, PT1000
DHB-402 / DHB-424
1 8
R: 400 Ω , 4000 Ω
RTD : PT100, PT500, PT1000
Figure 5: Connection for measuring temperature, DHB-402 and DHB-424 models.
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4. OPERATION
4.1.- MEASURING PARAMETERS
The unit measures or calculates all the parameters in Table 4:
Table 4:Measurement parameters
Parameter Display range Maximum display
range
Voltage Range: 10 V -10 ...10 V -13 ...13 V
Range: 60 mV 0 ... 60 mV -10 ... 63 mV
Current -20...20 mA -24...24 mA
Temperature: Type J thermocouple - 100 ... 1200 ºC - 200 ... 1200 ºC
Temperature: Type K thermocouple - 100...1370 ºC - 200 ... 1370 ºC
Temperature: Type N thermocouple - 100 ... 1300 ºC - 200 ... 1300 ºC
Temperature: Type E thermocouple - 100 ... 1000 ºC - 200 ... 1000 ºC
Temperature: Type R thermocouple - 50 ... 1760 ºC - 50 ... 1768 ºC
Temperature: Type S thermocouple - 50 ... 1760 ºC - 50 ... 1765 ºC
Temperature: Type PT100 RTD - 200 ... 850 ºC - 205 ... 855 ºC
Temperature: Type PT500 RTD - 200 ... 850 ºC - 205 ... 855 ºC
Temperature: Type PT1000 RTD - 200 ... 850 ºC - 205 ... 855 ºC
Resistance Range: 400 Ω 0 ... 400 Ω 0 ... 410 Ω
Range: 4000 Ω 0 ... 4000 Ω 0 ... 4010 Ω
Current time 0.00 ... 23.59 0.00 ... 23.59
4.2.- DISPLAY
The display is divided into 2 areas:
Figure 6:
Measurement
data area
Unit of
measurement
area
Areas of the DHB-4xx display
Measurement data area, for viewing the value of the parameter measured or calculated by
the unit.
Unit of measurement area, where you can see the unit for the parameter you are viewing.
To do so, select the label with the unit of measurement you wish to use and stick it in its space.
Then activate the corresponding LED (see section “4.7.9.4. DISPLAYING THE UNIT OF MEASURE-
MENT”) .
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and there are 5 LEDs, Figure 7:
Figure 7:
Alarm LEDs
Measurement time LED
LEDs of the DHB-4xx
4 alarm LEDs, indicating the active alarm.

1measurement time LED, indicating that the calculation time has not ended.
The unit has a three-colour LED display: red, green and orange.
The unit can automatically change the colour of the display based on the programmable parameters
in the display menu (lower colour limit, upper colour limit, lower colour, middle colour and upper
colour).
Example: In a temperature measurement you can program the display to be green when the voltage
is below 10ºC, orange when it is between 10ºC and 50ºC and red for voltages above 50ºC. See section
“4.7.3.- DISPLAY.”
4.3.- BUTTON FUNCTIONS
The DHB-4xx has 4 buttons that allow you to browse the various screens and program the unit (Table
5):
Table 5: Button functions on the measurement screens.
Button Short press Long press (3 s)
- Enter the setup menu (editing mode)
Display maximum value. -
Display minimum value. -
- Enter the setup menu (display mode)
Delete the maximum value -
Delete the minimum value -
- Delete the alarm LED
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4.4.- OPEN COLLECTOR OUTPUT, OC (DHB-424 model)
The DHB-424 unit has an NPN-type open collector output, terminals 27 and 28 of Table 3, indicating an
over-range for the measurement. See “5.- TECHNICAL FEATURES”
4.5.- REGRESSION OF NON-LINEAR EQUATIONS
Normally, an instrument's measurement is given by the equation for a line; in other words, there are
two pairs of points that provide the measurement.
However, it may be the case that two points are not sufficient to adjust the signal's operation.
For this reason, the DHB-4xx can work with non-linear equations with up to a maximum of 20 points
(Figure 8).
X1
Y1
Y7
Y8
Y9
Y10
Y6
Y5
Y4
Y3
Y2
X2 X3 X4 X5 X6 X7 X8 X9 X10 Measured values
Expected values
Input function
Linearised function
Figure 8:Regression of non-linear equations.
Once the number of points with which the function will be linearised has been selected (the number of
functions is one fewer than the number of points), program the consecutive points by giving them the
measured values (Xi) and the values expected to correspond to them (Yi) (0 < i < n).
While the function is being estimated, keep in mind that with non-linear functions, the more linear
segments there are, the less error there will be in terms of the linearisation.
If the measured values are less than X1, then it will rescale, based on the first line calculated at points
(X1, Y1) and (X2, Y2).
Values above Xn (where n < 22- the last measured value), will display a calculated value based on the
last configured linear function.
See section “4.7.2 REGRESSION OF NON-LINEAR EQUATIONS.” for configurations of non-linear equations
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DHB-402 DHB-424

4.6.- ALARMS
The DHB-402 unit has:
2 alarm relays, Alarm 1 and 2, terminals 9, 10, 11, and 12 of Table 2, with normally open (NO)
contact.
2 alarms, Alarm 3 and 4, fully programmable but not linked to any relay.
The DHB-424 model has:
2 alarm relays, Alarm 1 and 2, terminals 9, 10, 11, and 12 of Table 2, with normally open (NO)
contact.
2 switched alarm relays, Alarm 3 and 4, terminals 31, 32, 33, 34, 35, and 36 of
Table 3.
Each of the alarms can operate in the following work modes (Figure 9):
 n-on: the alarm is activated when the average value exceeds the upper value PrH and does
not deactivate until it is below the lower value PrL.
n-off: the alarm is deactivated when the average value exceeds the upper value PrH and
does not activate until it is below the lower value PrL.
on: the alarm is activated when the average value exceeds the lower value PrL and does not
deactivate until it is above the upper value PrH.
off: the alarm is deactivated when the average value exceeds the lower value PrL and does
not activate until it is above the upper value PrH.
h-on: This option is always enabled for manual simulation.
h-off: This option is always disabled for manual simulation.
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PrL PrH Measured
value
Alarm
output
Alarm
deactivated
Alarm
activated
1
0
PrL PrH Measured
value
Alarm
output
Alarm
activated
Alarm
deactivated
1
0
PrL PrH Measured
value
Alarm
output
Alarm
deactivated
Alarm
activated
Alarm
deactivated
1
0
PrL PrH Measured
value
Alarm
output
Alarm
deactivated
Alarm
activated
Alarm
activated
1
0
PrL PrH Measured
value
Alarm
output
Alarm
deactivated
Alarm
activated
1
0
PrL PrH Measured
value
Alarm
output
Alarm
activated
Alarm
deactivated
1
0
PrL PrH Measured
value
Alarm
output
Alarm
deactivated
Alarm
activated
Alarm
deactivated
1
0
PrL PrH Measured
value
Alarm
output
Alarm
deactivated
Alarm
activated
Alarm
activated
1
0
PrL PrH Measured
value
Alarm
output
Alarm
deactivated
Alarm
activated
1
0
PrL PrH Measured
value
Alarm
output
Alarm
activated
Alarm
deactivated
1
0
PrL PrH Measured
value
Alarm
output
Alarm
deactivated
Alarm
activated
Alarm
deactivated
1
0
PrL PrH Measured
value
Alarm
output
Alarm
deactivated
Alarm
activated
Alarm
activated
1
0
PrL PrH
Measured
value
Alarm
output
Alarm
deactivated
Alarm
activated
1
0
PrL PrH
Measured
value
Alarm
output
Alarm
activated
Alarm
deactivated
1
0
PrL PrH
Measured
value
Alarm
output
Alarm
deactivated
Alarm
activated
Alarm
deactivated
1
0
PrL PrH
Measured
value
Alarm
output
Alarm
deactivated
Alarm
activated
Alarm
activated
1
0
n-on n-o󰀨
on o󰀨
Figure 9: Alarm working modes.
4.7.- CONFIGURATION
The unit has various setup menus where you can configure:

The input parameter.
Regression of non-linear equations.
The display.
The alarms.
The outputs (DHB-424 model).
The service parameters.
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DHB-402 DHB-424

Inp0
0ser0
S
R
DHB-124
0oUt0
S
R
DHB-124
Alr01
S
R
DHB-124
Alr04
S
R
DHB-124
dIsp0
S
R
DHB-124
0Ind0
S
R
Input parameter
Regression of non-linear equations.
Display parameters
Parameters of the alarms 1, 2, 3 and 4..
Service parameters
Parameters of the outputs (Model DHB-424)
Parameters of the alarms 1, 2, 3 and 4..
end
Display
screen
Figure 10: Accessing the setup menus
The DHB-4xx does not record programming changes until the configuration is complete. If the unit is
reset before finishing the configuration or if no button is pressed for 30 seconds, the configuration will
not be stored in the memory.
To enter the setup menu press the button for 3 seconds.
If the setup menu is password-locked the display will read SEC along with a flashing 0value:
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Figure 11:Password screen
To modify the password, press the button.
To modify the value of the selected digit, press the button repeatedly.
To jump to the next digit, press the button.
Once at the desired value, validate by pressing the button.
If the password is incorrect or no password has been entered, the screen in Figure 12 will appear and
the unit will go to the display screen.
Figure 12:Incorrect password screen.
If the password is correct, the unit will display the parameters screen Figure 13.
To permanently unlock the unit, see “4.7.9.2. PASSWORD”
Note: By default, the unit comes without a password.
4.7.1.- INPUT PARAMETERS
This menu is used to configure the input parameters.
Press the button to access the first configuration parameter.

S
R
DHB-424
Figure 13:Input parameters menu main screen.
4.7.1.1.- TYPE OF INPUT
This screen is used to select the type of input that has been connected to the unit.
The screen flashes between the symbol and the configured value. (Figure 14)
Figure 14: Parameter to display screen.
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To edit the parameter, press the button.
The parameters that can be displayed are:
RTD sensor: Pt 100 RTD sensor: Pt 500
RTD sensor: Pt 1000 Resistance measurement
up to 400 Ω
Measuring resistance
up to 4000 Ω Type J thermocouple
Type K thermocouple. Type N thermocouple
Type E thermocouple Type R thermocouple
Type S thermocouple Voltage input 0...10 V
Current input
0...20 mA Voltage input 0...60 mV
Current time
To move from one option to another, press the button repeatedly.
When you see the option you want, validate by pressing the button. The unit goes back to the
screen shown in Figure 14.
To move to the next parameter on the menu, press the button.
When the button is pressed, the unit goes to the main screen of the input parameters menu (Figure
13).
Default value: Pt 100 (Pt 1).
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4.7.1.2.- COMPENSATION VALUE
Note: Parameter applicable to temperature (RTD and Thermocouple) and resistance measurement in-
puts.
This configuration screen is used to select the compensation value.
For the RTD sensors this value is defined by the cable that joins the RTD sensor to the unit.
For the thermocouples it is defined by the cold junction.
The screen flashes between the symbol and the configured value. (Figure 15).
Figure 15: Compensation value screen.
To edit the parameter, press the button.
To modify the value of the selected digit, press the button repeatedly.
To jump to the next digit, press the button.
Once at the desired value, validate by pressing the button.
You can now select the position of the decimal point, which will be flashing.
To select the position of the decimal point, press the button.
Validate by pressing the button. The unit goes back to the screen shown in Figure 15
To move to the next parameter on the menu, press the button.
When the button is pressed, the unit goes to the main screen of the input parameters menu (Figure
13).
Range: RTD temperature or resistance measurement input : 0 ... 20 Ω.
Thermocouple temperature input : 0 ... 60ºC.
Note: If a value is programmed that is out of range, the unit will activate automatic compensation.
Default value: 0.
4.7.1.3.- MEASUREMENT TIME
This screen lets you configure the measurement time for the input signal in seconds.
The screen flashes between the symbol and the configured value (Figure 16).
Figure 16:Measurement time display screen.
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To edit the parameter, press the button.
To modify the value of the selected digit, press the button repeatedly.
To jump to the next digit, press the button
Once at the desired value, validate by pressing the button.
Validate by pressing the button. The unit goes back to the screen shown in Figure 16.
To move to the next parameter on the menu, press the button.
When the button is pressed, the unit goes to the main screen of the input parameters menu (Figure
13).
Range: 1 ... 3600 s.
Default value: 1
4.7.1.4.- EXITING THE MENU
At the end of the menu the screen shown in Figure 17 appears.
Press the button to go back to the main screen of the input parameters menu Figure 13.
Figure 17:Exit menu screen.
4.7.2.- REGRESSION OF NONLINEAR EQUATIONS
This menu is used to configure the parameters to carry out regressions of non-linear equations (see
section “4.5.- REGRESSION OF NON-LINEAR EQUATIONS”).
Press the button to access the first configuration parameter.
Figure 18:Regression of non-linear equations menu.
4.7.2.1.- NUMBER OF POINTS
This screen is used to select the number of points to be configured for regressions of non-linear equa-
tions. The screen flashes between the symbol and the configured value ( Figure 19).
Figure 19:Number of points screens.
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