ACM3P-4-AC1-R-C Datasheet PDF - Murata Power Solutions

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ACM3P-4-AC1-R-C
Murata Power Solutions

Part Number ACM3P-4-AC1-R-C
Description Three-Phase AC Ammeters
Page 6 Pages


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ACM3P Series
Three-Phase AC Ammeters
Actual size
FEATURES
Measure and display the true-rms current of 3-phase
power systems
Universal 85-264Vac (47-63Hz) operating supply
range
Three built-in current transformers measure up to
100A per phase
Ideal for power distribution units (PDUs) and backup
power systems
Low power consumption: less than ¼watt from
120Vac supply
One-piece polycarbonate housing fits ‘0U’ & ‘1U’
rack spaces
Low-profile surface mount design occupies minimal
behind-the-panel space
Available in red, green, or blue LED-displays with
phase annunciators
Low Cost; UL/CSA approvals pending
SIMPLIFIED SCHEMATIC DIAGRAM
PRODUCT OVERVIEW
Murata Power Solutions’ ACM3P series 3-phase AC ammeters measure and display the
true-rms values of 2- or 3-phase ac mains current. A front panel touch switch enables the
selection of a continuous reading of any of the three phases. All ACM3P ammeters are func-
tionally complete, with built-in L1, L2, and L3 current transformers—no other user-supplied
components or hardware are required.
ACM3P series AC ammeters are available with a 0-100A input range (150A peaks) and
provide a resolution of 0.1 Amp. Their 85-264Vac (47-63Hz) operating supply range makes
these ammeters perfect for worldwide 3-phase current monitoring applications. And, unlike
conventional average-responding products, ACM3P ammeters can accurately display the
true-rms values of triangle waves, square waves, and other irregularly shaped AC current
waveforms, with an accuracy of ±1% of full scale.
Their large (0.36"/9.2mm), bright LED display, available in a choice of red, blue, or green,
enables ACM3P ammeters to be 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’ or horizontal ‘1U’ rack spaces. Their miniature size is ideal for UPS
backup power sources, power strips, alternative energy metering, and any other applica-
tions that require precise monitoring of 2- or 3-phase ac current.
PHASE 2
L2
PHASE 1
L1
PHASE 3
L3
L1 L2 L3
+5V
A/D
CONVERTER
B
85-264 Vac
47-63 Hz
A
For full details go to
www.murata-ps.com/rohs
AC/DC
CONVERTER
+5V
+5V
MICRO-
CONTROLLER
SEL
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MPM_ACM3P Series.A01 Page 1 of 6
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Performance/Functional Specifications
Typical at TA=+ 25ºC, 120Vac @ 60Hz, unless otherwise noted
Measurement Limits
Min. Typ. Max.
Units
AC (rms) Current, L1, L2, L3
0.0 — 100.0 Amperes
Overcurrent Rating
1.5 x Rated full-scale current
Performance
Sampling Rate
2-3 samples/sec
Current Accuracy
±1%
Measurement Bandwidth (L1, L2, L3)
14kHz
Temperature Drift (0 to 60ºC)
0.5 Counts/ºC
Zero-Current Reading (within 1 sec.)
1
Counts
Supply Voltage (TB1)
All Models
85 120 264 Vac/47-63Hz
Supply Current
ACM3P-X-AC1-R-X-C
35 50 110
mA
ACM3P-X-AC1-G-X-C
50 75 165
mA
ACM3P-X-AC1-B-X-C
50 75 165
mA
Power Supply Terminal Block (TB1)
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 display
Decimal Point Selection
Automatically Set
Physical/Environmental
Operating Temperature:
0 — +60
ºC
Storage Temperature:
-40 — +75
ºC
Humidity (non-condensing):
0 — 85
%
Dimensions:
See mechanical specifications
Weight, all models
2.6 oz (74g)
Notes
Specified full-scale currents are those passing through the power meter’s built-in
current transformer’s primary load-circuit. See Notes 2 and 3 below for additional
information.
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 level.
Power Meters are calibrated with near full-scale 50Hz sine-wave inputs.
All specified maximum supply currents are steady state. Larger surge currents can
occur at initial application of line power.
ORDERING INFORMATION
ACM3P-4-AC1-R-C
100A, 85-264Vac Supply, Red LED Display
ACM3P-4-AC1-G-C*
100A, 85-264Vac Supply, Green LED Display
ACM3P-4-AC1-R-B-C* 100A, 85-264Vac Supply, Blue LED Display
*Consult factory for availability
ACM3P Series
Three-Phase AC Ammeters
TECHNICAL NOTES
IMPORTANT! To ensure safe and reliable operation, ACM3P amme-
! ters 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: ACM3P series 3-phase ammeters employ a
precision energy metering integrated circuit and a low-power micro-
controller to measure and display the rms value of 2- or 3-phase
ac-mains current. However, while the unit has an upper bandwidth
of 14kHz, dc components or frequencies below 47Hz 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
amperes, with one of the three phase-annunciator LEDs illuminated
(L1, L2, or L3). The display will remain fixed in one of these reading
modes as long as the front panel ‘SEL’ button is not touched. Assum-
ing phase L1 is initially illuminated, momentarily touching the ‘SEL’
button two times in succession will cycle the display to phase L2, and
then to phase L3. Momentarily touching ‘SEL’ a third time will return
the unit back to displaying phase L1 current.
If power is removed and then restored, the ACM3P will perform a
self-test and then return to displaying the last selected phase, i.e.,
the phase it displayed just before power was removed.
Configuring for 2-Phase Operation: As shipped, ACM3P ammeters
are configured to measure and display 3-phase currents (L1, L2, and
L3 current transformers are all active). The unit can be set to display
2-phase currents (only L1 and L2 are active) by performing the fol-
lowing procedure:
A. Press and hold the SEL button for approximately five seconds and
then release the button once the words “LinE SEt” appear on the
display.
B. Briefly tapping the SEL button will alternate the display reading
between ‘2-Ph’ and ‘3-Ph’ each time SEL is tapped.
C. To change the factory default 3-phase mode to 2-phase, leave the
display fixed in the ‘2-Ph’ reading for at least five seconds.
To revert the unit back to 3-phase operation simply repeat the above
procedure but, in step C, allow the unit to display a fixed ‘3-Ph’ for at
least five seconds.
3. Overrange Indication: ACM3P ammeters have an overcurrent rat-
ing of 1.5 times rated current, or 150A. However, accuracy is only
guaranteed up to 100A, and the display will flash on and off when the
current is at or above 120A.
4. Calibration: Due their digital design, ACM3P ammeters cannot be
calibrated in the field. ACM3P ammeters are factory-calibrated to
meet their specified accuracies with the factory supplied current
transformers. Use of any other current transformers will produce
significant errors.
Contact Murata Power Solutions if additional information is required
regarding calibration, setup, or any other technical issue pertaining to
ACM3P ammeters.
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TECHNICAL NOTES, CONTINUED
5. Wiring: All power supply and load wiring must be rated for the volt-
ages and currents they will carry and must comply with any code or
application-mandated requirements pertaining to the user’s specific
installation.
6. Supply Fusing, and Grounding: Wires specified in the Functional
Specifications section must be used for making connections to AC-
M3P series ammeters’ TB1 terminal block. No connection is required
for earth/chassis ground.
ACM3P series ammeters are not internally fused. Terminal block TB1
is to be used only for powering the ammeter'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.
Wire insulation must be stripped to within ±10% of the stated dimen-
sions, and wires should be inserted into TB1 such that their insulation
is not pinched by the screw terminal.
7. Current Transformer Phasing: Since the ACM3P only measures
amperes, transformer phasing is not required. ‘Phasing’ refers to the
direction of the current-carrying wire as it passes through the primary
hole of each of the three built-in current transformers.
ACM3P Series
Three-Phase AC Ammeters
8. Connector Torque Ratings: It is important to tighten TB1’s screw-
terminals to their rated torque specification of 3.6 pound-inches
(0.4Nm). Proper tightening will minimize connector losses and ensure
safe, reliable operation.
9. Isolation: Except for the 2-56 thread metallic mounting studs, all of
the ACM3P ammeter’s internal components (printed circuit board,
resistor, capacitors, current transformers L1, L2 and L3’s secondary
leads, etc.) are at the ac-mains potential connected to TB1. ACM3P
ammeters are designed to be powered from one ac power-source
only. Any other connection schemes could introduce significant mea-
surement errors.
The three built-in current transformers have a dielectric breakdown
rating of 2kV minimum, allowing them to safely monitor 480V,
3-phase ac mains currents. This dielectric rating pertains only to the
insulated load-carrying wire as it passes through the built-in CT’s
primary hole. However, attention must still be paid to ensure adequate
wire-to-wire spacings, and wire-to-metallic surface spacings. Prop-
erly rated wiring and fusing must be used for all installations, as noted
in Technical Notes 5 and 6 above.
IMPORTANT: Even though ACM3P ac ammeters can be used in 480V
current monitoring applications, the ac supply connected to TB1 must
never exceed the maximum rating of 264V/47-63Hz.
PANEL
ACM3P
2-56 Hex Nuts (4 places)
Tighten each nut to 15 to 20
ozf-in (0.106 to 0.140 N-m).
L1
L2
L3
SIDE VIEW
Figure 1. Panel Installation
PANEL INSTALLATION
All connections to ACM3P ammeters must be made after the unit is
securely attached to the panel, and with all associated load and sup-
ply 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
ammeter’s built-in current transformers L1, L2, and L3. The installed
wire-positions should be such that minimal mechanical forces are
applied to the current transformers, TB1, or to the ACM3P ammeter
itself. In high-vibration environments, it is strongly recommended that
strain reliefs be used for all wiring.
Using Figure 1 as a guide, carefully insert the ACM3P 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.
The recommended panel thickness range 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 user-
supplied hardware or modifications.
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TYPICAL WIRING DIAGRAMS
PHASE A
L1
Note: Line and phase currents
are the same for Wye systems.
PHASE B
L2
L1
L2
L3
L3
PHASE C
Figure 2. Wiring diagram Wye systems
L1
PHASE A
PHASE B
L1
L2
L2
L3
ACM3P Series
Three-Phase AC Ammeters
B TB1
A
Fuse*
85–264 Vac
47–63 Hz
*See technical note 6.
B TB1
A
L1
PHASE A
L3 Fuse*
PHASE C
85–264 Vac
47–63 Hz
Figure 3. Wiring diagram for Delta systems monitoring line current
PHASE B
L1
L2 L2
L3
B TB1
A
PHASE C
L3
Fuse*
85–264 Vac
47–63 Hz
Figure 4. Wiring diagram for Delta systems monitoring phase current
*See technical note 6.
*See technical note 6.
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ACM3P-4-AC1-R-C Three-Phase AC Ammeters ACM3P-4-AC1-R-C
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