Performance/Functional Specifications

Typical at TA=+ 25ºC, 120Vac @ 50Hz, unless otherwise noted

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-B-C

100A, 85-264Vac Supply, Blue LED Display

ACM3P-4-AC1-B-28-C

100A, 85-264Vac Supply, Blue LED Display,

28 inch lead length

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 am-

peres, 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. Assuming 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 follow-

ing 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.

ACM3P ammeters with manufacturing date codes of June 2016 or

later have the additional ability to continuously scroll (“auto-scroll”)

through all 3 phases, or auto-scroll through only 2 phases.

The process for configuring the ACM3P for auto-scrolling operation

begins by first holding down the ‘SEL’ switch for five seconds to enter

the programming mode that is indicated by the display showing “LinE

SEt.”

After the unit displays “LinE SEt,” immediately and repeatedly

pressing and releasing the

SEL switch will cycle the unit through the

following four operating-mode options:

!

Measurement Limits

Min.

Typ.

Max.

Units

AC (rms) Current, L1, L2, L3 ➀

0.0

—

100.0

Amperes

Overcurrent Rating ➁

1.5 x Rated full-scale current

Performance

Sampling Rate

1.5 samples/sec

Current Accuracy ➂

±2%

±3%

Measurement Bandwidth (L1, L2, L3)

14kHz

Temperature Drift (0 to 65ºC)

0.5 Counts/ºC

Zero-Current Reading (within 1 sec.)

1

Counts

UL/IEC61010-1

Measurement category II

Supply Voltage (TB1)

All Models

85

120

264

Vac/47-63Hz

Supply Current ➃

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

—

+65

ºC

Storage Temperature:

-40

—

+75

ºC

Humidity (non-condensing):

0

—

85

%

Dimensions:

See mechanical specifications

Weight, all models

2.6 oz (74g)

Notes

➀

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.

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 level.

➂

Power Meters are calibrated with near full-scale 50Hz sine-wave inputs.

➃

All specified maximum supply currents are steady state. Larger surge currents can occur at

initial application of line power.

continued on next page

www.murata.com-ps/support

ACM3P Series

Three-Phase AC Ammeters

MPM_ACM3P Series.C02 Page 2 of 6

*See http://www.murata.com/products/power for model-specific availability.