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ACM3P Series
Three-Phase AC Ammeters
Performance/Functional Speci?cations
Typical at TA=+ 25oC, 120Vac @ 50Hz, unless otherwise noted
Measurement Limits
Min.
Typ.
Max.
Units
TECHNICAL NOTES
AC (rms) Current, L1, L2, L3 ?
Overcurrent Rating ?
Performance
Sampling Rate
Current Accuracy ?
Measurement Bandwidth (L1, L2, L3)
Temperature Drift (0 to 60oC)
Zero-Current Reading (within 1 sec.)
UL/IEC61010-1
0.0
— 100.0 Amperes
1.5 x Rated full-scale current
1.5 samples/sec
±2%
±3%
14kHz
0.5 Counts/oC
1 Counts
Measurement category II
!
IMPORTANT! To ensure safe and reliable operation, ACM3P amme-
ters must be installed and serviced by quali?ed 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.
Supply Voltage (TB1)
All Models
Supply Current ?
ACM3P-X-AC1-R-X-C
ACM3P-X-AC1-G-X-C
85
35
50
120
50
75
264
110
165
Vac/47-63Hz
mA
mA
2. Basic Operation : Upon application of ac power to TB1, the unit
will ?rst 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 ?xed in one of these reading
modes as long as the front panel ‘SEL’ button is not touched. Assum-
ACM3P-X-AC1-B-X-C
Power Supply Terminal Block (TB1)
Wire Size
Insulation Strip Length
Screw Tightening Torque
Rated Voltage
Display
50
75 165 mA
16-22AWG, solid or stranded
6.4mm (0.250 in)
0.4Nm (3.6 lb-in)
300Vac
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.
Con?guring for 2-Phase Operation: As shipped, ACM3P ammeters
Display Type and Size
Overrange Indication
Decimal Point Selection
Physical/Environmental
4 Digit LED, 9.14mm (0.36in) high
Flashing display
Automatically Set
are con?gured 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:
Operating Temperature:
Storage Temperature:
Humidity (non-condensing):
0
-40
0
—
—
—
+60
+75
85
oC
oC
%
A. Press and hold the SEL button for approximately ?ve seconds and
then release the button once the words “LinE SEt” appear on the
display.
Dimensions:
Weight, all models
See mechanical speci?cations
2.6 oz (74g)
B. Brie?y tapping the SEL button will alternate the display reading
between ‘2-Ph’ and ‘3-Ph’ each time SEL is tapped.
Notes
? Speci?ed 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 speci?ed maximum supply currents are steady state. Larger surge currents can occur at
initial application of line power.
ORDERING INFORMATION
C. To change the factory default 3-phase mode to 2-phase, leave the
display ?xed in the ‘2-Ph’ reading for at least ?ve 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 ?xed ‘3-Ph’ for at
least ?ve 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 ?ash on and off when the
current is at or above 120A.
4. Calibration: Due their digital design, ACM3P ammeters cannot be
ACM3P-4-AC1-R-C
ACM3P-4-AC1-G-C
ACM3P-4-AC1-B-C
100A, 85-264Vac Supply, Red LED Display
100A, 85-264Vac Supply, Green LED Display
100A, 85-264Vac Supply, Blue LED Display
calibrated in the ?eld. ACM3P ammeters are factory-calibrated to
meet their speci?ed accuracies with the factory supplied current
transformers. Use of any other current transformers will produce
signi?cant errors.
Contact Murata Power Solutions if additional information is required
regarding calibration, setup, or any other technical issue pertaining to
ACM3P ammeters.
www.murata-ps.com/support
MPM_ACM3P Series.A04 Page 2 of 6
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