DMR30-DCV1

DMR30-DCV1 MURATA-PS | Alldatasheet

Document overview

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Technical content

Features

 Selectable +/-200mV, 2V, 20V input ranges  Bright 0.45" (11.4mm) LED display visible up to 20 feet (6 meters)  Long-life contactless touch-sensor controls  Peak and valley measurement modes  Digital filter option for measurements in noisy environments  Solid-state alarm relay with programmable trip-point and hysteresis  Convenient mounting options  Operates from 9 to 32 VDC  Low current consumption; 40mA typical at 12VDC  Two year warranty For full details go to www.murata-ps.com/rohs

DMR30-DCV1.A01 Page 2 of 11 www.murata-ps.com/support.html MEASUREMENT PERFORMANCE MIN. TYP. MAX. UNITS Measurement ranges ±200mVDC; ±2VDC; ±20VDC Accuracy (Measured using 4 ½ digit display formats) 0.05 0.2 % Full-Scale Temperature Stability 0.005 %Full-Scale/°C Input Impedance 1 MΩ Common Mode Rejection Ratio (DC) 100 dB Absolute Maximum input voltage (+VIN to –VIN) -40 +40 V Absolute Maximum input voltage (either +VIN or –VIN to –VS) -48 48 V POWER SUPPLY CHARACTERISTICS. Min. Typ. Max. Units Operating Supply Voltage; 9 32 VDC Absolute Maximum Supply Voltage -1 34 VDC Operating Supply Current 12V operation 24V operation mA USER INTERFACE Display Type and Size 5 Digit Alphanumeric LED, 11.4mm (0.45in) Height

4 LED Annunciators (‘Alarm’, ‘Max’, ‘Min’, ‘mV’)

User Controls Four capacitive touch sensors Display Modes Normal, Max Voltage, Min Voltage Over-range Indication Flashing Value Display Update Rate 2.5 updates/sec. Decimal Point Selection Automatically Set Main Menu Password <RIGHT> <UP> <RIGHT> <UP> <RIGHT> RELAY OUTPUT Min. Typ. Max. Units ‘Off’-state voltage (measured across RELAYA to RELAYB) terminals -40 +40 V ‘On’-state current -250 +250 mA ‘On’ state resistance 1 Ω TERMINAL BLOCKS (TB1, TB2, TB3) Wire Size 14-24 AWG Insulation Strip Length 6mm (0.24 in.) Screw Tightening Torque 0.4 N-m (3.5 lb-in) PHYSICAL/ENVIRONMENTAL Min. Typ. Max. Units Operating Temperature 0 +50 ⁰C Storage Temperature -40 +75 ⁰C Humidity (non-condensing) 0 85 % Dimensions See Mechanical Specifications Drawing Weight (including mounting nut and gasket) 64g (2.2 oz)

DMR30-DCV1.A01 Page 3 of 11 www.murata-ps.com/support.html OPERATION: Measurement Type and Capabilities DMR30-DCV1 series digital voltmeters employ a precision ADC and a low-power microcontroller to measure and display DC voltage. These meters provide user-selectable measurement ranges of +/-200mVC, 2VDC, and 20VDC, with a 1 MΩ input impedance. The meter’s measurement system supports a common-mode input voltage range of up to +/-48V in relation to the power supply return (-VS connector), simplifying applications where the meter’s power supply return is not suitable for a –VIN reference. The number of display digits is also user-selectable to support applications where additional digits may be a distraction. A digital filter option with three settings (OFF, FAST, SLOW) is offered to help optimize for operations in electrically noisy environments. FRONT PANEL & FRONT PANEL LAYOUT AND FUNCTION 1. Annunciator LEDs: This cluster of 3 LEDs indicate various meter states, such alarm status, measurement mode, and unit. 2. Display: This is a 5-character + sign alphanumeric LED display is used to indicate measurements, informational prompts, and meter setup parameter values. 3. Touch-Sensor Control Buttons: Four capacitive touch- sensors are provided to support meter control and configuration. These four buttons will be referred to in this document as <UP>, <DOWN>, <LEFT>, and <RIGHT> reflecting their printed arrow directions. DMR30-DCV1 meters defaults to ‘normal mode’ in which the meter displays the current value of the measured voltage. If the measured input value falls outside of the meter’s acceptable measurement range, either over-range or under-range, the display will flash.While the meter’s alarm functions are enabled, the ALARM annunciator is lit whenever the alarm relay is activated (closed). Alternate Measurement Modes (MAX, MIN) In addition to displaying the current value of the measurement (normal mode), the meter can also display historical high and low values. To perform these operations, the meter offers a number of alternate measurement modes: 1. In MAX mode, the meter displays the highest value which has been measured since the last time the user pressed the <LEFT> button (RESET). MAX mode is active when the MAX LED is illuminated. 2. In MIN mode, the meter displays the lowest value which has been measured since the last time the user pressed <LEFT> button (RESET). MIN mode is active when the MIN LED is illuminated. These alternate measurement modes may be selected by repeatedly pressing the <DOWN> button until the desired mode LED is illuminate d. The alternate modes may be disabled by repeatedly pressing the <DOWN> button until all mode LEDs are off and the meter is returned to normal operating in which it will display the current measurement. Access to the alternate measurement modes may be disabled by setting the MODES setting to OFF using the configuration menu. If alternate modes are disabled, then pressing either the <DOWN> or <LEFT> buttons will result in an ‘ERROR’ message being briefly displayed before resuming normal operation.

DMR30-DCV1.A01 Page 4 of 11 www.murata-ps.com/support.html ELECTRICAL CONNECTIONS: Rear Panel Layout: Screw Terminal Function: The DMR30-DCV1 provides six screw-terminal connectors for making electrical connections, as shown and described: Alarm Relay Connections The DMR30-DCV1 provides a solid-state relay output that ‘closes’ when an alarm condition is detected. This circuit is electrically isolated from the meter’s measurement circuitry and the power supply inputs, providing a high degree of applications flexibility – similar to that of a mechanically contacting relay. Because the output relay is a semiconductor device, caution should be exercised when driving loads which have high inrush currents such as incandescent lamps or inductive loads such as electromechanical relays , as the associated current and voltage spikes may damage the meter. When used to drive an inductive load, a ‘flyback’ diode should be connected across the relay coil (ensuring correct polarity so that it will not forward conduct under normal use) to suppress high transient voltages that may damage the DMR30-DCV1, as shown in the following illustration: DMR30-DCV1 RELAYA RELAYB ELECTROMECHANICAL RELAY ‘FLYBACK’ DIODE Note that the diode must be connected so that it does not forward conduct when the relay is turned on. DC SUPPLY Notes:

• The alarm relay circuit’s isolation is not intended for use as a safety isolation barrier. The maximum voltage between the alarm relay terminals (RELAYA or RELAYB) and the input terminals (+VIN, -VIN) or power supply terminals (+VS, -VS) must be limited to +/-48VDC. The alarm relay is intended to provide an informational signal of over-temperature/under-temperature conditions; for example driving a piezoelectric siren or LED lamp to signal the condition.
• The DMR30’s alarm output relay must not be used in the control loop of any type of system where it either directly or indirec tly signals that a heating or cooling element is to be turned on or off, or used as a safety limit switch. Power Supply Connections The meter is powered through the +VS and –VS terminals and requires a DC power supply which may range from 9VDC to 32VDC. This supply is electrically isolated from the meter’s measurement electronics, so that the meter’s negative or return measurement input ter minal (-VIN) does not need to be connected to the meter’s power return terminal (-VS), and may vary as much as +/-48V from this connection. Please note that the meter’s isolation barrier is intended only to simplify measurements, and not for safety purposes – the maximum voltage between the power supply terminals (+VS or –VS) and the measurement input terminals (+VIN, -VIN) must be limited to +/-48VDC. The DMR30 series of meters incorporates protection against momentary applications of both overvoltage and rever se polarity to the power supply(+VS, -VS) terminals. Depending on regulatory and application requirements it may also be necessary for the user to add external fusing. Measurement Inputs Voltage to be measured by the DMR30-DCV1 is applied to the +VIN and -VIN connections (terminals 5 and 6). Unlike many panel meters, the DMR30-DCV1 measurement inputs are electrically isolated from the power supply terminals, which allows for fully differential measur ements over a common-mode range of +/-48V with respect to the power supply terminals +VS or -VS. Screw terminal Location: Terminal # Name Function

1 RELAYB

Alarm Relay outputs 2 RELAYA 3 +VS Power supply terminals (9VDC - 32VDC) 4 -VS 5 +VIN Measurement Input terminals 6 -VIN Note: It is important to tighten all screw-terminals to their torque specification of 4.5 lb.-in (0.51Nm). Proper tightening will help ensure reliable operation. Applications subject to vibration should use stranded wire.

DMR30-DCV1.A01 Page 5 of 11 www.murata-ps.com/support.html CONNECTION EXAMPLE The following shows a DMR30-DCV1 application where the alarm relay is used to drive a piezoelectric siren. In this example, a 12VDC power supply is connected to the +VS and –VS terminals, the voltage to be measured is connected to the +VIN and –VIN inputs, and the alarm relay is used to control a piezoelectric siren, also powered from the +12VDC power supply. METER CONFIGURATION Configuration Menu The DMR30 family incorporates an interactive menu system to support meter configuration. This system eliminates the need for jumpers, d ipswitches or trim-pots and also allows the meter be easily configured after it has been installed in an application. Entering and Navigating the Menu System The DMR30’s user configuration system is structured as a main menu from which individual configuration options are selected for editing. When in measurement mode, pressing the <RIGHT> button will cause the meter to enter the main menu, and display the first main menu entry - RANGE. To prevent accidental changes to the meter’s configuration, entry to the main menu may optionally be password protected. If the password protection option is enabled (See MLOCK entry on pg.8 for details), then the user will be prompted to enter a series of five button-touches to enter the main menu. Once in the main menu, the meter will display the currently selected entry. The <UP> and <DOWN> buttons may be used to change the active selection.

DMR30-DCV1.A01 Page 6 of 11 www.murata-ps.com/support.html MENU CONFIGURATION MENU DIAGRAM: DMR30-DCV1 Range D Fmt Brite Filt Alarm Aset Ahyst Atest Mlock Frst Passcode Menu Numeric Entry Confirm Yes/No Numeric Entry Main Menu Mlock=ON Mlock=OFF Modes OFF Fast Slow ON OFF A-ON A-OFF Enable Min/Max Modes Interactive Alarm Relay Test Enter Alarm Hysteresis Value Enter Alarm Set-point Value Select Digital Data Filter Brightness Selection Select Display Digits +/- Full-scale Voltage Range Bolded Items are Factory Defaults 20% 30% 90% 100% ON OFF Password Protect Settings Reset To Factory Defaults OFF HiLim LoLim Choose Alarm Enabled/Type 200mV 2 V 20 V 99999 9999 999 USING THE MENU When the meter is displaying a main menu item, pressing the <RIGHT> button will display the submenu associated with that menu item. For example, if BRITE is the currently selected main menu item, then pushing the <RIGHT> button will display the brightness submenu, and display the currently selected brightness level (100% being the default). Exiting the main menu and return to measurement mode may be done in two ways. The first is to press the <LEFT> button. The second method is to simply do nothing – if the meter is in the menu system and no button presses are registered for approximatel y 60 seconds, the meter will automatically return to measurement mode. The <LEFT> arrow also may be used to return from a submenu back to the main menu.

DMR30-DCV1.A01 Page 7 of 11 www.murata-ps.com/support.html USING THE MENU The Main Menu The DMR30-DCV1 has the following MAIN MENU configuration options:

• RANGE – This submenu is used to select the meter’s measurement range. Available options may be scrolled through using the <UP> and <DOWN> buttons. When the desired Range setting is displayed, pressing the <RIGHT> button will update the Range option to the displayed value and return to the main menu, while pressing the <LEFT> button will return to the MAIN MENU without updating the value.
• The DMR30-DCV1 supports the following range options: Menu Option Range 20V +/-20 VDC input range 2V +/- 2 VDC input range 200mV +/-200 mV input range – ‘mV’ annunciator illuminated in this range USING THE MENU
• D FMT This submenu is used to select the number of digits used to display the measurement. The available options are 999, 9999, and 99999. The <UP> and <DOWN> buttons are used to scroll through these options. When the desired setting is displayed, pressing the <RIGHT> button will update the D FMT option to the displayed value and return to the main menu, while pressing the <LEFT> button will return to the main menu without updating the option value.
• BRITE – This submenu is used to adjust the brightness of the meter’s display. By using the <UP> and <DOWN> buttons the display can be adjusted from 20% to 100% intensity in 10% increments. To aid in selecting an appropriate brightness level, the meter’s b rightness is adjusted in real time as the various menu options are displayed. Once a desired brightness setting has been found, this option may be updat ed by pressing the <RIGHT> button, which updates the option value and returns to the main menu. Pressing the <LEFT> button will return to the main menu with the brightness setting being unchanged.
• FILT– This option selects the degree of digital filtering that is applied to the measured signal. The available options are (1) OFF - in which no filtering is used, (2) FAST – in which a small amount of filtering is applied to the signal, and (3) SLOW – in which a larger amount of filtering is applied to the signal. The <UP> and <DOWN> buttons are used to scroll through the filter options. Pressing the <RIGHT> button will update the option to the displayed value and return to the main menu. Pressing the <LEFT> button will return to the main menu without updating the option.
• ALARM – This submenu controls the operation of the alarm relay output. This submenu has three avail able options; (1) OFF, where the alarm output is disabled and always off, (2) HILIM, where the alarm relay is turned on when the measured voltage is greater than the alarm set-point value, and (3) LOLIM, where the alarm output is turned on when the measured voltage is less than the alarm set-point value. The <UP> and <DOWN> buttons may be used to scroll through these options. To update the setting to the selected option and return to the MAIN MENU, press the <RIGHT> button. To return to the MAIN MENU without updating the setting, press the <LEFT> button.
• ASET – This submenu is a numeric entry field used to set the alarm set-point value. On entry to this submenu, the current value of the alarm set-point is displayed and may be edited. Upon entering this option, the display will show the current alarm value, and set a blink ing cursor at the sign character. The <UP> and <DOWN> buttons are used to set the sign or to increment/decrement the currently se lected digit. The <RIGHT> button selects the next digit, or if at the rightmost digit, accepts the displayed value and returns to the MAIN MENU. The <LEFT> button can be used to move the cursor left, or if the cursor is set to the sign position, exits the s ubmenu without changing the current alarm set-point value.
• AHYST– This setting controls the alarm hysteresis value. When the alarm is set to HILIM mode, the hysteresis is subtracted from th e alarm set-point to get a ‘turn-off’ threshold below which the alarm relay is opened. Similarly (but opposite), when the alarm is set to LOLIM mode, the hysteresis value is added to the set-point to provide a turn-off threshold above which the alarm relay is opened. The process for setting the alarm hysteresis value is similar to setting the alarm set-point value, with the buttons providing identical functionality. Unlike ASET values, however, AHYST values may only be set to values greater than or equal to zero.

DMR30-DCV1.A01 Page 8 of 11 www.murata-ps.com/support.html USING THE MENU

• ATEST– This submenu allows the user to interactively test the alarm relay circuit without needing to adjust either the alarm set -point or the signal applied to the meter inputs. On entering this menu option, the <UP> button will turn the alarm relay ON, while the <DOWN> button will turn the alarm relay OFF. Either the <LEFT> or <RIGHT> buttons will exit this submenu, set the alarm relay to the OFF condition, and return to the MAIN MENU. Note that the alarm relay is set to the OFF state when the meter is in the menu system regardless of either the meter input signal alarm settings.
• MODES – This submenu is used to enable or disable the alternate measurement modes (see Alternate Measurement Modes , pg. 3). When the Modes option is set to ON, MIN and MAX reading modes for the meter will be available from the front panel. When this option is set to OFF , attempting to set the meter to MIN or MAX mode will result in an ERROR message being displayed.
• MLOCK – This submenu is used to enable or disable password protection for the MAIN MENU. If MLOCK option is set to ON, pressing the <RIGHT> button in operating mode results in a flashing cursor, prompting for the entry of a button -sequence password. The following password sequence must then be entered to access the MAIN MENU: If the MLOCK option is set to OFF, pressing the <RIGHT> button in operating mode will immediately enter the MAIN MENU. Note that the password is set at the factory and is not user-modifiable.
• FRST – This submenu resets the meter configuration to the factory default values. To reset the meter, scroll to the YES option using the <UP> button and then press the <RIGHT> button to confirm. To quit this submenu without resetting the meter, press the <LEFT> button. DMR30-DCV1 FACTORY DEFAULT CONFIGURATION MAIN MENU Item Default Value RANGE 20 V D FMT 99999 BRITE 100% FILT OFF ALARM OFF ASET 0 AHYST 0.0 MODES ON MLOCK OFF

DMR30-DCV1.A01 Page 9 of 11 www.murata-ps.com/support.html TECHNICAL NOTES 1. Calibration The DMR30-DCV1 is calibrated at the factory at manufacture. There are no user or field-adjustable calibration features. 2. Wiring: Power supply and input wiring must be rated for the electrical and environmental conditions under which the meter will be operated. They must also comply with any regulatory or application-mandated requirements pertaining to the user’s installation. The terminal blocks can accommodate wire gauges ranging from #14 to #24 AWG. Wiring Insulation should be stripped to 6mm (0.24”). All wires must be inserted into the terminal block openings such that the screw terminal does not pinch any insulation. It is important to tighten all screw-terminals to their torque specification of 4.5 lbf-in (0.51Nm). Proper tightening will help ensure reliable operation. Applications subject to vibration should use stranded wire. After final assembly, inspect all terminal blo ck connections for shorts between adjacent conductors; this step is especially important when using stranded wire. 3. Protection and Fusing: DMR30 meters’ power supply leads (+VS, -VS) are protected against momentary overvoltage and reverse polarity conditions. Input terminals +VIN and -VIN are protected against noise and brief voltage transients. Protection, however, is not provided against sustained conditions exceeding the limits listed in in the Performance & Functional Specifications Table. External fusing must be supplied by the user in accordance to applicable safety and regulatory requirements for the system in which the DMR30 is installed. 4. Noisy Power Supplies Some power supplies contain high-frequency switching devices that may conduct and/or radiate significant noise onto the low -level signal developed across the measurement inputs. Even though the DMR30 incorporates built-in input filtering, some portion of this noise may be amplified and subsequently measured by its sensitive input circuitry. Limiting runs of wire to <3m is strongly recommended. Also, in systems with noisy power supplies, connecting an external, non-polarized capacitor across the +VS and -VS inputs can help reduce measurement errors. In certain situations, the use of twisted pair or shield wiring may be required. 5. Self-Diagnostics On power-on the meter performs a self-test and checks the integrity of calibration and configuration data stored in internal non-volatile memory. If the factory calibration data has been corrupted, the meter will display ‘NoCal’ on power -on and approximately once a minute thereafter to indicate that the meter is relying on default calibration factors and that dis played measurements may have more than the datasheet-specified amount of error. If the meter detects that its configuration data has been corrupted, it will display ‘NoCFG’ and attempt to reset itself to the default factory configuration.

DMR30-DCV1.A01 Page 10 of 11 www.murata-ps.com/support.html PANEL INSTALLATION PANEL CUTOUT OPTIONS Option 1 For mounting with single 50mm nut Option 2 For mounting with 3x 64.5mmscrews Option 3 For mounting with 3x 62mm screws Housing Flange Modifications for Mounting Options 1 and 2

DMR30-DCV1.A01 Page 11 of 11 www.murata-ps.com/support.html MECHANICAL SPECIFICATIONS Murata Power Solutions, Inc. 129 Flanders Rd. Westborough, Ma 01581, USA. ISO 9001 and 14001 REGISTERED This product is subject to the following operating requirements and the Life and Safety Critical Application Sales Policy: Refer to:https://www.murata-ps.com/requirements/ Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. ©2019 Murata Power Solutions, Inc..