CIRCUTOR DHB User Manual
Vdc Voltmeter or ammeter
DHB-202
DHB-224
INSTRUCTION MANUAL
(M043B01-03-14A)
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Contents
1. APPLICATION AND METER DESIGN ........................................5
2. METER SET ..................................................................................6
3. BASIC REQUIREMENTS, OPERATIONAL SAFETY .................7
4. INSTALLATION ............................................................................8
5. SERVICE ....................................................................................11
6. RS-485 INTERFACE ..................................................................27
7. ERROR CODES .........................................................................41
8. TECHNICAL DATA ....................................................................42
9. MAINTENANCE AND TECHNICAL SERVICES ........................44
10. GUARANTEE ............................................................................45
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1. APPLICATION AND METER DESIGN
The DHB-2xx meter is a programmable digital panel meter destined for
the measurement of d.c. voltage or d.c. current. Additionally, the meter
enables the indication of the current time. The readout field is a LED
display, which allows the exposition of results in colours: red, green
and orange. The measured input signal can be arbitrary converted by
means of a 21-point individual characteristic.
Features of the DHB-2xx meter:
l display colour individually programmed in three intervals,
l programmable thresholds of displayed overflows,
l 2 NOC relay alarms operating in 6 modes,
l 2 switched relay alarms with a switching contact operating
in 6 modes (DHB-224),
l signaling of the measuring range overflow,
l automatic setting of the decimal point,
l programming of alarm and analog outputs with the reaction
on the chosen input quantity (main or auxiliary input),
l real-time clock with the function of the clock supply support
in case of the meter supply decay,
l programmed averaging time – function of walking window with the
averaging time up to 1 hour,
l monitoring of set parameter values,
l interlocking of introduced parameters by means of a password,
l recount of the measured quantity on the base of a 21-point
individual characteristic,
l service of the interface with MODBUS protocol in the
RTU mode (DHB-224),
l conversion of the measured value into a standard – programmable
current or voltage signal (DHB-224),
l highlight of any measuring unit acc. to the order.
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l signaling of alarm operation – switching the alarm on causes
the highlight of the output number,
l galvanic separation between connectors: alarm, supply, input,
analog output connections and RS-485 interface.
Protection degree from frontal side: IP65
Meter overall dimensions: 96 x 48 x 93 mm (with terminals).
The meter casing is made of plastics.
Fig. 1. View of the DHB-2xx meter
2. METER SET
The set is composed of:
- DHB-2xx meter ..................................................... 1 pc
- User’s manual ......................................................1 pc
- Guarantee card .................................................... 1 pc
- Clamps to fix in the panel ....................................4 pcs
- Seal ......................................................................1 pc
When unpacking the meter, please check whether the type and execution code on the data plate correspond to the order.
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3. BASIC REQUIREMENTS, OPERATIONAL
SAFETY
In the safety service scope, the DHB-2xx meter meets the requirements
of the EN 61010-1 standard.
Observations concerning the operational safety
l All operations concerning transport, installation, and commissioning
as well as maintenance, must be carried out by qualified, skilled personnel, and national regulations for the prevention of accidents must
be observed.
l The programming of DHB-2xx meter parameters must be carried
out after disconnecting measuring circuits
l Before switching the meter on, one must check the correctness of
connections.
l Do not connect the meter to the network through an autotransformer.
l Before removing the meter housing, one must switch the supply off
and disconnect measuring circuits.
l The meter is designed to be installed and exploited in electromag-
netic industrial environment conditions.
l Non-authorized removal of the housing, inappropriate use, incorrect
installation or operation, creates the risk of injury to personnel or meter
damage.
For more detailed information, please study the User’s Manual.
l When connecting the supply, one must remember that a switch or
a circuit-breaker should be installed in the building. This switch should
be located near the device, easy accessible by the operator, and
suitably marked as an element switching the meter off.
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4. INSTALLATION
The meter has separable strips with screw terminals, which enable the
connection of external wires of 2.5 mm2 cross-section. Strips of input
signals are protected against any accidental disconnection by means
of a screw joint.
One must prepare a hole of 92
thickness should not exceed 6 mm.
The meter is adapted to be mounted in a panel. The meter must be
introduced from the panel front with disconnected supply voltage. Before the insertion into the panel, one must check the correct placement
of the seal. After the insertion into the hole, fix the meter by means of
clamps (fig.2).
+0,6
Fig. 2. Meter fixing
´ 45
+0,6
mm in the panel, which the
Fig. 3. Overall dimensions
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4.1. Signals Leads
Signals led out on the meter connectors are presented on the fig. 4.
All input signals are separated between them from remaining circuits.
Analog outputs are not separated between them. One don’t have to
take simultaneously advantage of voltage and current measurements, since measuring circuits of voltage and current are not galva-
nically isolated.
( Model DHB-224)
DHB-202 / DHB-224
Fig. 4. Description of signals on connection strips
· 1 A, 5 A – terminals for the current measurement on the 1 A
or 5 A range.
· 100 V, 500 V – terminals for the voltage measurement on the 100 V
or 500 V range.
· OC –output of open collector type with an npn output transistor.
The output is turned on in case of a measuring range overflow.
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4.2. Examples of Connections
An example of the DHB-2xx meter connection for current measurement
is presented on the fig. 5.
However, an example of the meter connection in the configuration for
voltage measurement is presented on the fig. 6.
DHB-202 / DHB-224
Fig. 5. Meter connection in the configuration for current measurement
DHB-202 / DHB-224
Fig. 6. Meter connection in the configuration for voltage measurement
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5. SERVICE
5.1. Display Description
Fig. 7. Description of the meter frontal plate
5.2. Messages after Switching the Supply on
After switching the supply on, the meter displays the meter name
DHB-2xx, and next the program version in the form „r x.xx” – where
x.xx is the number of the current program version or the number of a
custom-made execution. Next, the meter carries out measurements
and displays the value of the input signal. The meter sets automatically the decimal point position, when displaying the value. The
format (number of places after the decimal point) can be limited by
the user.
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5.3. Functions of Push-buttons
- Acceptation push-button:
Þ entry in programming mode (press and hold ca 3 seconds)
Þ moving through the menu – level selection,
Þ entry in the mode changing the parameter value,
Þ acceptation of the changed parameter value.
Þ stop the measurement – when holding down the push, the result
is not updated. The measurement is still carried out.
Þ Turning on the power supply of the meter while holding the button
– entering the software-update mode through RS485 interface
- Push-button increasing the value:
Þ display of maximal value, The pressure of the push-button causes
the display of the maximal value during ca 3 seconds.
Þ entry in the level of the parameter group,
Þ moving on the chosen level,
Þ change of the chosen parameter value – increasing the value.
- Push-button to change the digit:
Þ display of minimal value, The pressure of the push-button causes
the display of the maximal value during ca 3 seconds.
Þ entry in the level of parameter group,
Þ moving through the chosen level,
Þ change of chosen parameter value – shift on the next digit,
- Resignation push-button:
Þ entry in the menu monitoring the meter parameters (press and
hold ca 3 seconds),
Þ exit from the menu monitoring meter parameters,
Þ resignation of the parameter change,
Þ strict exit from the programming mode (press and hold
ca 3 seconds).
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The pressure of the push-button combination and holding down them during ca 3 seconds causes the deletion of alarm signaling. This operation acts only when the support function is switched on.
The pressure of the push-button combination causes
the erasing of the minimal value.
The pressure of the push-button combination causes
the erasing of the maximal value.
The pressure and holding down the push-button during ca 3
seconds causes the entry to the programming matrix. The programming matrix can be protected by a safety code.
The pressure and holding down the push-button during ca 3
seconds causes the entry to the menu monitoring meter parameters.
One must move through the monitoring menu by means of and
push-buttons. In this menu, all programmable meter parameters are available only for readout. In this mode, the menu Ser is not
available. The exit from the monitoring menu is carried out by means of
the push-button. In the monitoring menu, parameter symbols
are displayed alternately with their values.
The service algorithm of the meter is presented on the fig. 8.
The appearance of the symbols mentioned below on the display
means:
- Incorrectly introduced safety code.
- Overflow of the upper measuring range.
- Overflow of the lower measuring range.
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Fig. 8. Service algorithm of the DHB-2xx meter
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