Murata ACM20-5-AC1-R-C Four-function ac power meter Datasheet

ACM20 Series
www.murata-ps.com
Four-Function AC Power Meters
New!
ttage
Low-Wa
Models
le
Availab
PRODUCT OVERVIEW
Actual size
C
®
Murata Power Solutions’ ACM20 series AC power meters display the most critical measurements in mains-powered equipment: voltage, amperage, active power (watts), and power
factor. A front panel selector-switch provides two modes of operation: a fixed reading of
any of the four parameters, or a continuous cycling through all four measurements. An
optional model displays line frequency with 0.1Hz resolution. All ACM20 multi-function
power meters include built-in current transformers—no other user-supplied components
are required.
US E156931
FEATURES
„
Displays AC Volts, Amps, Watts, and Power Factor or Hertz
„
Two display modes: continuous auto cycling or fixed
„
Universal 85-264Vac (47-63Hz) operating range
(Measurement Category II)
ACM20 series AC power meters are available in a choice of three input ranges: 0-10A (with
0.001A resolution, 999.9 watts max.); 0-32A (with 0.01A resolution, 9999 watts max.); and
0-100A (0.1A resolution, 26.4kW max.). An 85-264Vac (47-63Hz) operating supply range
makes these power meters perfect for worldwide power monitoring applications. And,
unlike conventional, average-responding products, ACM20 power meters can accurately
display the real power and true-rms current values of triangle waves, square waves, and
other irregularly shaped waveforms, with a typical accuracy of ±1% of full scale.
„
Built-in current transformers simplify installation; choice of
10A, 32A, or 100A ranges
„
Ideal for power distribution units (PDUs) and power strips
„
True-rms readings of complex voltage and current waveforms
„
Low-power consumption: less than ¼watt from 120Vac
„
One-piece polycarbonate housing fits ‘0U’ & ‘1U’ racks
Their large (0.36"/9.2mm), bright red LED display makes ACM20 AC power meters easily
readable from as far as 15 feet (5 meters). All units are packaged in a one-piece, vibration
resistant, polycarbonate housing that can be installed in vertical ‘0U’ and ‘1U’ rack spaces.
Their miniature size is perfect for UPS power sources, power strips, laboratory instrumentation, alternative energy applications, and any other products that require precise monitoring
of AC power.
„
Surface mount design occupies minimal panel space
„
Bright red LED-display with four annunciators
„
Optional Frequency reading models (0.1Hz resolution)
„
Approvals to UL/CSA/IEC/EN 61010-1
SIMPLIFIED SCHEMATIC DIAGRAM
VOLTS
AMPS
WATTS
PF
LOAD CURRENT
+5V
L1
A/D
CONVERTER
+5V
B
85-264 Vac
47-63 Hz
A
+5V
AC/DC
CONVERTER
MICROCONTROLLER
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SEL
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03 Mar 2011
MPM_ACM20 Series.A09 Page 1 of 6
ACM20 Series
Four-Function AC Power Meters
Performance/Functional Specifications
Typical at TA=+ 25ºC, 120Vac @ 60Hz, unless otherwise noted
Measurement Limits
Min.
Typ.
Max.
Units
AC Voltage
85.0
-
264.0
Volts
AC Current, 10A models ➀
AC Current, 32A models ➀
AC Current, 100A models ➀
Active Power: 10A models
Active Power: 32A models
Active Power: 100A models
0.00
0.00
0.0
0
0
0
-
9.999
32.00
100.0
999.9
9999
26.4
Amperes
Amperes
Amperes
Watts
Watts
kW
Frequency
47.0
-
63.0
Hz
Power Factor
.00
1.00
-
-
Overcurrent Rating ➁
ORDERING INFORMATION
Performance
Voltage Accuracy ➂
±1%
Current Accuracy ➂
±1%
Power Accuracy ➂
±2%
Frequency Accuracy ➂
±0.1
Power Factor Accuracy
±3%
Measurement Bandwidth
!
2-3 samples / sec
Hz
140Hz (Voltage), 14kHz (Current)
Temperature Drift (0 to 60ºC)
0.5 Counts/ºC
Zero-Current Reading (within 2 sec.)
0.00
Amps
Zero-Power Reading (within 2 sec.)
0
Watts
Supply Voltage (TB1) (Measurement Category II)
All Models – 47-63 Hz
85
120
264
Vac
35
50
110
mA
Supply Current ➃
All Models
Power Supply Terminal Block
Wire Size
16-22AWG, solid or stranded
Insulation Strip Length
6.4mm (0.250 in)
Screw Tightening Torque
0.4Nm (3.6 lb-in)
Rated Voltage
300Vac
Display
Display Type and Size
4 Digit LED, 9.14mm (0.36in) high
Overrange Indication
Flashing ‘9999’ Watts ➄
Decimal Point Selection
Automatically Set
Physical/Environmental
Operating Temperature
Storage Temperature
Humidity (non-condensing)
Dimensions
Weight: 32A models
Weight: 100A models
Hex Nut Tightening Torque
0
–
+60
°C
–40
–
+75
°C
0
–
85
%
10A, 85-264Vac Supply (Power Factor Reading)
ACM20-5-AC1-R-C
32A, 85-264Vac Supply (Power Factor Reading)
ACM20-4-AC1-R-C
100A, 85-264Vac Supply (Power Factor Reading)
ACM20-2-AC1-R-F-C
10A, 85-264Vac Supply (Frequency Reading)
ACM20-5-AC1-R-F-C
32A, 85-264Vac Supply (Frequency Reading)
ACM20-4-AC1-R-F-C
100A, 85-264Vac Supply (Frequency Reading)
TECHNICAL NOTES
1.5 x rated full-scale current
Sampling Rate
ACM20-2-AC1-R-C
IMPORTANT! To ensure safe and reliable operation, ACM20 power
meters must be installed and serviced by qualified technical personnel. Contact Murata Power Solutions if there is any doubt regarding
their installation or operation.
1. Measurement Type: ACM20 series multifunction AC power meters
employ a precision energy metering integrated circuit and a lowpower microcontroller to measure and display the rms voltage and
current, active (real) power, power factor (or line frequency on ‘–F’
suffix models) of ac mains supplies from 47-63Hz. Please note,
ACM20 power meters use the voltage present at their TB1 terminal
block and the secondary current of their built-in current transformer
L1 to calculate and then display VOLTS, AMPS, WATTS, power factor
(PF), or line frequency on ‘-F’ HERTZ models.
While the ACM20 displays the rms value of line voltage and line
current, the VOLTS reading has an upper limit of 140Hz (-3db point),
which means rectangular-shaped voltage waveforms, and waveforms
with sharp transitions, will read lower than their true-rms value. For
example, a square wave line voltage will read approximately 1-2%
lower, a triangle wave will read 3% lower, and a modified sine wave
will read 18% lower. The oscillograms on page seven illustrate typical
ACM20 VOLTS readings when powered from four ac waveforms.
The 140Hz bandwidth limit does not apply to the WATTS reading nor
to the AMPS reading. The circuitry used for these two measurements
has an upper bandwidth of 14kHz. ACM20 power meters are mains
operated devices designed to measure ac currents and voltages,
within the specified limits previously noted. DC currents and voltages
will not be measured accurately.
2. Basic Operation: Upon application of ac power to TB1, the unit will
first perform a self-test routine and then continuously display ac volts
with the VOLTS LED annunciator illuminated. The display will remain
in the VOLTS mode as long as the front panel ‘SEL’ button is not
touched.
See mechanical specifications
1.3oz (37.9g)
1.5oz (43.5g)
0.14 N-m (20 ozf-in)
➀ Specified full-scale currents are those passing through the power meter’s built-in current
transformer’s primary load-circuit.
➁ The overcurrent rating of 1.5 x the rated full-scale current is a continuous rating and applies
to the current passing through the built in current transformer. Accuracy is guaranteed up to
the rated current.
➂ ACM20 Power Meters are calibrated with near full-scale 60Hz sine-wave inputs.
➃ All specified maximum supply currents are steady state; larger surge currents can occur at
initial application of line power.
➄ Applies to 10A and 32A models only.
After the unit powers up to normal operation in the VOLTS reading
mode, momentarily (approximately one second) touching the ‘SEL’
button on the unit’s front panel three times in succession will cycle
the display to AMPS, WATTS, and end at PF (or HERTZ for ‘–F’ models). Momentarily touching ‘SEL’ a fourth time will return the display
back to the VOLTS reading mode.
Holding the ‘SEL’ button down for 3 seconds will place the unit in a
continuous auto-cycling mode, and the display will repetitively scroll
through all four measurements, with each measurement remaining
displayed for 3 seconds.
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03 Mar 2011
MPM_ACM20 Series.A09 Page 2 of 6
ACM20 Series
Four-Function AC Power Meters
When the continuous auto-cycling mode is initially selected, the unit
will briefly display ‘Auto On’ before continuous cycling begins. Momentarily touching the ‘SEL’ button again will cause the unit to briefly
display ‘Auto OFF’ before it returns to the fixed VOLTS reading mode.
Wire insulation must be stripped to within ±10% of the stated dimensions, and wires should be inserted into TB1 such that their insulation
is not pinched by the screw terminal.
6. Current Transformer Polarity: In order to perform accurate Watts
and Power Factor measurements, connections to the two rear power
supply inputs, TB1-A and TB1-B, and built-in current transformer L1
must have the proper polarity. That is, the load current flowing in the
wire passing through L1's center hole must have the same polarity as
the line voltage connected to TB1-A and TB1-B.
3. Calibration: Due their digital design, ACM20 power meters cannot be
calibrated in the field. ACM20 power meters are factory-calibrated to
meet their specified accuracies with the supplied L1 current transformer. Use of any other current transformer will produce significant
errors for the Amps, Watts, and Power Factor measurements.
Contact Murata Power Solutions if additional information is required
regarding calibration, setup, or any other technical issue pertaining to
ACM20 power meters.
The wiring diagrams in Figures 1-4 ensure that, for a purely resistive
load, current flowing in current transformer L1’s primary circuit will
have the same polarity as the applied voltage at TB1. If proper polarity
is not followed, the Watts and Power Factor readings will be zero. To
correct a zero Watts reading, simply reverse the direction of the load
wire passing through the hole in L1.
4. Wiring: All power supply wiring must be rated for the voltages and
currents they will carry and must comply with any code or application-mandated requirements pertaining to the user’s specific installation.
7. Connector Torque Ratings: It is important to tighten TB1’s, screwterminals to their rated torque specification of 3.6 pound-inches
(0.4Nm). Proper tightening will minimize connector losses and ensure
safe, reliable operation.
5. Supply Fusing, and Grounding: Wires specified in the Functional
Specifications section must be used for making connections to
ACM20 series power meters. No connection is required for earth/
chassis ground.
8. Isolation: Except for the 2-56 thread metallic mounting studs, all of
the ACM20 power meter’s internal components (printed circuit board,
resistor, capacitors, current transformer L1’s secondary leads, etc.)
are at the ac-mains potential connected to TB1. ACM20 power meters
are designed to measure and be powered from one ac power-source
only. Any other connection schemes will introduce significant measurement errors.
ACM20 series power meters are not internally fused. Terminal block
TB1 is to be used only for powering the power meter's internal circuitry;
it must not be used to supply power to external loads. The supply wires
feeding these power meters must be fused with a 0.5A/250V time
delay/time lag fuse, in accordance with applicable regulatory codes.
TYPICAL WIRING DIAGRAMS
120 V
LOAD
Epoxy encapsulation
B
Note: If the ACM20 displays zero Watts with
power applied to the load, reverse the direction
of the wire passing through the CT's center hole.
See Technical Note 6 for more information.
Fuse*
TB1
A
Polarity dot on bottom
H
N
120 Vac (50/60 Hz)
Figure 1. Wiring diagram for 110/120V single phase systems
*See technical note 5.
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03 Mar 2011
MPM_ACM20 Series.A09 Page 3 of 6
ACM20 Series
Four-Function AC Power Meters
TYPICAL WIRING DIAGRAMS, CONT.
220 V
LOAD
Epoxy encapsulation
Note: If the ACM20 displays zero Watts with
power applied to the load, reverse the direction
of the wire passing through the CT's center hole.
See Technical Note 6 for more information.
B
Fuse*
TB1
A
Polarity dot on bottom
L1
L2
220 Vac (50/60 Hz)
Figure 2. Wiring diagram for 220/240V systems with no neutral
*See technical note 5.
220 V
LOAD
Epoxy encapsulation
Note: If the ACM20 displays zero Watts with
power applied to the load, reverse the direction
of the wire passing through the CT's center hole.
See Technical Note 6 for more information.
B
Fuse*
TB1
A
Polarity dot on bottom
L1 Neutral L2
220 Vac (50/60 Hz)
Figure 3. Wiring diagram for 220/240V systems with neutral (monitoring L1)
*See technical note 5.
220 V
LOAD
Epoxy encapsulation
B
Note: If the ACM20 displays zero Watts with
power applied to the load, reverse the direction
of the wire passing through the CT's center hole.
See Technical Note 6 for more information.
Fuse*
TB1
A
Polarity dot on bottom
L1 Neutral L2
*See technical note 5.
220 Vac (50/60 Hz)
Figure 4. Wiring diagram for 220/240V systems with neutral (monitoring L2)
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03 Mar 2011
MPM_ACM20 Series.A09 Page 4 of 6
ACM20 Series
Four-Function AC Power Meters
PANEL INSTALLATION
Using Figure 5 as a guide, carefully insert the ACM20 assembly into
the panel opening. From the rear of the panel, install and then tighten
the four #2-56 hex nuts over the threaded studs. Tighten each nut to
15 to 20 ozf-in (0.106 to 0.140 N-m). Use only the factory-supplied
hardware as the use of substitute hardware could result in an unsafe
installation and/or adversely affect the reliability of the installation.
All connections to ACM20 power meters must be made after the unit
is securely attached to the panel and with all associated load and
supply voltages de energized (off), using extreme caution and observing all safety measures applicable to the user’s installation.
Care should be exercised when passing conductors through the
power meter’s built-in current transformer L1. The installed wirepositions should be such that minimal mechanical forces are applied
to current transformer L1, TB1, or to the ACM20 power meter itself.
In high-vibration environments, it is strongly recommended that
adequate strain reliefs be used for all wiring.
The recommended range of panel thickness that can be used with the
supplied hardware is 0.040 inches (1.0mm) to 0.25 inches (6.4mm).
Panel thicknesses outside of this range may require additional usersupplied hardware or modifications. Front panel space permitting,
ACM20 power meters will fit most existing ACA-20RM / ACA-20PC
ammeter cutouts, allowing for easy upgrading of existing installations.
PANEL
ACM20
Panel Cutout
2-56 Hex Nuts (4 places)
Tighten each nut to 15 to 20 ozf-in (0.106 to 0.140 N-m).
L1
SIDE VIEW
Figure 5. Panel Installation
PANEL CUTOUT
RECOMMENDED DRILL AND PANEL CUTOUT DIMENSIONS
INTERNAL CORNER RADII:
0.032 (0.81) MAX.
1.07
(27.18)
0.838* - 0.870
(21.29* - 22.10)
1.336* - 1.426
(33.93* - 36.22)
1.626 (41.30)
0.093 (2.362) DIAMETER (4 REQUIRED)
* The two dimensions marked with an * specify the
minimum recommended panel cutout opening for
ACM20 power meters. Space permitting, the larger
dimensions noted (0.87in., and 1.426in.) should be
used. The panel opening must be centered vertically
and horizontally between the four 0.093 (2.362mm)
diameter holes.
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03 Mar 2011
MPM_ACM20 Series.A09 Page 5 of 6
ACM20 Series
Four-Function AC Power Meters
MECHANICAL SPECIFICATIONS
2.10 (53.3)
1.43
(36.3)
VOLTS AMPS WATTS
0.51
(12.95)
Dimensions are in inches (mm).
0.12 (3.05) (min)
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.51)
.XXX ± 0.010 (0.254)
Angles ± 2˚
1.07
(27.20)
Components are shown for reference only.
Side View
PF
SEL
AC POWER METER
0.40
(10.16)
Front View
0.12 (3.05) (min)
Lead Length
2.0 (50.5) min.
B
0.60
(15.24)
(max)
0.22 (5.59)
(min)
1.63
(41.4)
0.086 DIA (REF)
2-56 UNC THREAD
L1
TB1
A
0.33 (8.39)
(min)
Bottom View
ame
meter:
Diameter:
10A and 32A models: 0.35 (8.9)
100A models: 0.57 (14.5)
Back View
OSCILLOGRAMS
The graphs below show typical ACM20 power meter VOLTS readings when the unit is powered from four common ac-voltage waveforms.
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
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.
© 2011 Murata Power Solutions, Inc.
www.murata-ps.com/locations
email: [email protected]
03 Mar 2011
MPM_ACM20 Series.A09 Page 6 of 6
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