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DMS-20ACV-3-G-C

P1-P3P4-P4
www.murata-ps.com
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DMS-20ACV Series
480V, Self-Powered, AC Line Monitor
MPM_DMS-20ACV.B02 Page 1 of 4
Murata Power Solutions’ DMS-20ACV-3 is a low-cost, self-powered, 2-wire digital AC voltmeter designed
for monitoring 3-phase, 480Vac primary ac power sources. The DMS-20ACV-3’s unique power-supply
design allows a single model to operate from 350 to 600Vac, at line frequencies of 50 to 60Hz. No user-
supplied external components or auxiliary power sources are needed for full operation. Its large, 0.40 inch
(10.2mm), bright red or green LED display is easily readable under virtually all lighting conditions.
DMS-20ACV-3 AC voltmeters employ a microprocessor driven, half-wave averaging, analog-to-digital
converter to achieve a display resolution of 1Vac over its entire operating range. Also, the unit is per-
manently calibrated at the factory, ensuring stable, long-term accuracy by eliminating issues caused by
user-accessible adjustment potentiometers.
The DMS-20ACV-3 measures only 1.94” wide x 1.27” high (49.3mm x 32.3mm), and has an installed
behind-the-panel depth of less than 1.0” (25.4mm). Panel mounting is greatly simplifi ed by the use of a
bezel assembly that includes a color fi lter and secure metal fasteners.
This easy-to-use AC voltmeter is the ideal digital upgrade for fragile, less accurate, analog panel meters
used in 480Vac power distribution environments. It similarly excels in any new application requiring accu-
rate, high-voltage, AC line monitoring. Simply connect the AC power source to its 2-position terminal block
and the unit is fully operational.
FEATURES
Self-powered, 2-Wire operation
350 to 600Vac (50/60Hz) measurement range
Digital replacement for analog panel meters
Permanent, tamper-proof calibration
Half-wave averaging, rms calibrated input
Large, easy-to-read, bright red or green LED
display
Flashing display warns of overvoltage conditions
Reliable screw-style terminal block simplifi es
hookup
Rugged bezel assembly with secure metal
fasteners
Small footprint: 1.94W" x 1.27H" (49mm x 32mm)
PRODUCT OVERVIEW
MECHANICAL SPECIFICATIONS
MECHANICAL DIMENSIONS: Inches (mm)
TOLERANCES: 2 PL DEC ±0.02 (±0.51)
3 PL DEC ±0.010 (±0.254)
FRONT VIEW
BACK VIEW
SIDE VIEW
1.930
(49.02)
1.260
(32.00)
0.28
(7.1)
0.64
(16.3)
A
B
TB1
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DMS-20ACV Series
480V, Self-Powered, AC Line Monitor
MPM_DMS-20ACV.B02 Page 2 of 4
TECHNICAL NOTES
IMPORTANT! To ensure safe and reliable operation, DMS-20ACV ac
voltmeters must be installed and serviced by qualifi ed technical
personnel. Contact Murata Power Solutions if there is any doubt
regarding installation and/or operation.
1. Measurement Type: DMS-20ACV series AC voltmeters employ a
precision analog-to-digital converter and a stable voltage reference to
measure and display the average value of sinusoidal AC mains voltages.
Input voltages of 601V and above will cause the display to fl ash on and
off.
2. Calibration: DMS-20ACV voltmeters are digitally calibrated at the fac-
tory; there is no provision for calibrating units in the fi eld.
3. Power Supply Polarity, Fusing, Wiring, and Grounding: DMS-20ACV-3’s
TB1 ac-supply terminals are not polarity sensitive, that is, they have
no “AC LO” or “AC HI” designations. These meters do not include nor
require a connection to earth/chassis ground.
DMS-20ACV-3 AC voltmeters are not internally fused. Terminal block
TB1 is to be used only for powering the voltmeter’s internal circuitry; it
must not be used to supply power to external loads or auxiliary devices.
The supply wires connected to TB1 must be fused with a 0.25A/600V
time delay/time lag fuse, in accordance with applicable regulatory
codes.
All AC-supply wiring must be rated for the voltages and currents they
will conduct and comply with any code or application-mandated
requirements pertaining to the user’s specifi c installation. 600V, UL-
rated wire suitable for the intended application is required.
The recommended AC supply wire size is 16AWG to 22AWG (1.31mm
2
to 0.325mm
2
) stranded copper wire. The supply wires must be properly
stripped and attached to TB1 such that their insulation is not pinched
by the screw terminal. Recommended insulation strip length is 0.25"
(6.4mm). Rated tightening torque for the TB1’s screws is 7 pound-
inches (0.8 N-m).
Performance/Functional Specifi cations
Typical at TA=+ 25°C, 480Vac @ 60Hz, unless otherwise noted
Input Supply Voltage (Vin @ TB1) Min. Typ. Max. Units
AC (rms) Voltage @ 47-63Hz 350 480 600 Volts AC
Performance
Sampling Rate 2 samples/sec
Voltage Accuracy @ 25° C ±2 ±4 Volts
Temperature Drift (0 to 60ºC) 0.05 Volts/°C
Measurement Type
Half-wave averaging, rms calibrated for
sinusoidal inputs
Supply Current
@ 50Hz 8 11 mA
@ 60Hz 9 13 mA
Display
Display Type 3 Digit LED
Display Size 0.40 inches (10.16mm) high
Overrange Indication Flashing display for Vin > 600 Volts
Physical/Environmental
Weight 1.0 ounces (28 grams)
Operating Temperature -25 60 °C
Storage Temperature -40 75 °C
Relative Humidity (Non Condensing) 0 85 %
Ordering Information
DMS-20ACV-3-R-C 350 to 600Vac (50/60Hz) Red LED Display
DMS-20ACV-3-G-C 350 to 600Vac (50/60Hz) Green LED Display
*See technical note 3.
Figure 1. Wiring Diagram
BACK VIEW
A
B
TB1
350-600 Vac
47-63 Hz
Fuse*
0.25A/600V
FRONT V IEW
1.280
(3 2 .5 1 )
0.1 8 7
(4.7 5 )
1.8 2 6 ( 4 6 .3 8 )
RECO E M MN D ED D R L IL A N D
PA N EL C U O TUT D I E MNS O INS
0.838
(2 1 .29)
1.0 7
(2 7 .1 8 )
INTER N AL C OR N ER R AD : I I
0.0 3 2 ( 0.8 1 ) M A X .
0.1 1 6 ( 2.9 5 )
1.6 2 6 ( 4 1 .3 0 )
0.0 9 3 ( 2.362) D I E M A TER ( 4 R EQUIRED)
1.3 3 6 ( 3 3 .9 3 )
0.1 4 5 ( 3.6 8 )
(17.5)
0.69
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DMS-20ACV Series
480V, Self-Powered, AC Line Monitor
MPM_DMS-20ACV.B02 Page 3 of 4
PANEL INSTALLATION
BEZEL AND PANEL CUTOUT
All electrical connections to DMS-20ACV must be made after the voltmeter
is securely attached to the panel, and with the input AC supply voltage
de-energized (off). Care must be exercised when attaching the AC supply
wires to terminal block TB1. The installed wire-positions should be such
that minimal forces are applied to TB1 or the voltmeter. In high-vibration
environments, adequate strain reliefs must be used on all supply wiring.
Using Figure 2 as a guide, carefully insert the bezel/color fi lter assembly
into the panel opening. From the rear of the panel, install the four 8mm
plastic standoffs over the bezel’s threaded studs. Install the DMS-20ACV
pc-board assembly and attach and tighten the four #2-56 hex nuts over the
threaded studs. Tighten each hex nut to 15 to 20 ozf-in (0.11 to 0.14 N-m).
Figure 2. Panel Installation
Use only the factory-supplied hardware as the use of substitute hardware
may result in an unsafe installation and/or adversely affect the reliability of
the installation.
The range of panel thicknesses that can be accommodated with the
factory supplied hardware is 0.040 inches (1.0mm) to 0.125 inches
(3.2mm). Panel thicknesses greater than 3.2mm may require additional
user-supplied hardware or modifi cations to achieve an electrically safe and
mechanically secure installation. However, do not use any substitutes for
the 8mm round plastic standoffs supplied with the voltmeter. Please note,
thick panels will alter the readability of the LED display.
SIDE VIEW
Bezel
Gasket
Standoff
Nut
DMS-20ACV
AC Voltmeter
Board-Cutout
PANEL
Gasket
Standoff
0.315 (8mm)
0.032 (0.8) Thick
P1-P3P4-P4

DMS-20ACV-3-G-C

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Manufacturer:
Description:
480V, SELF-POWERED, AC LINE MONITOR
Lifecycle:
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