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ACA-20RM-ALM Series
True-rms-AC Ammeters with Alarm Function
Performance/Functional Speci?cations
Typical at T A = +25°C, unless otherwise noted.
? Speci?ed full-scale currents are those passing through the ammeter’s built-in
current transformer’s primary load-circuit. See Notes 2 and 3 below for ad-
ditional model-speci?c information.
Rated Full-Scale Current ?
ACA-20RM-4-ACX-RL-ALM
Min.
—
Typ.
—
Max.
50.0
Units
Amperes
? 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 only,
ACA-20RM-5-ACX-RL-ALM
Overcurrent Rating ?
Performance
—
— 30.0 Amperes
1.5 x Rated Full-Scale Current
it does not apply to any external circuit-wiring or external loads. Accuracy is
guaranteed up to the rated current level.
? Speci?ed accuracy applies to inputs with crest factors (CF) up to 2.0, where CF
= Vpeak/Vrms. Crest factors of 2 to 5 introduce an additional error of ±3% of full
Sampling Rate
Accuracy ?
Measurement Type
2.5 Samples per second
±0.4%FS ±3 Counts with 60Hz
Sine-Wave Input
rms Responding, Crest Factors of 1-5
scale. Ammeters are calibrated with a near full-scale 60Hz sine-wave current
?owing through the ammeter’s built-in CT.
? All speci?ed maximum power supply currents are steady state; larger surge
currents can occur at initial application of line power.
Temperature Drift (0 to 60 °C)
—
±0.2
±0.4
Counts/oC
Ordering Information
Zero-Current Reading (within
30 sec.)
–001
000
001
Counts
ACA-20RM-4-AC3-RL-ALM-C
ACA-20RM-4-AC4-RL-ALM-C
50.0A Range (split-core CT), 85-140Vac power
50.0A Range (split core CT), 170-264Vac power
Dielectric Withstanding Voltage
UL/IEC61010-1
2000
— — Vdc
Measurement category II
ACA-20RM-5-AC3-RL-ALM-C
ACA-20RM-5-AC4-RL-ALM-C
30.0A Range, 85-140Vac power
30.0A Range, 170-264Vac power
Power Supply Voltage
TECHNICAL NOTES
ACA-20RM-X-AC3-RL-ALM
ACA-20RM-X-AC4-RL-ALM
Power Supply Current ?
ACA-20RM-X-AC3-RL-ALM
ACA-20RM-X-AC4-RL-ALM
85
170
—
—
120
220
30
30
140
264
50
50
Vac/47-63Hz
Vac/47-63Hz
mA/47-63Hz
mA/47-63Hz
IMPORTANT! To ensure safe and reliable operation, ACA-20RM-
ALM ammeters must be installed and serviced by quali?ed
technical personnel. Contact Murata Power Solutions if there is
any doubt regarding ammeter setup, installation, or operation.
1. Measurement Type: ACA-20RM-ALM ac ammeters employ a
Alarm Function
Display indication
Settable range
ACA-20RM-4-ACX-RL-ALM
ACA-20RM-5-ACX-RL-ALM
Power Supply Terminal Block
Wire Size
Insulation Strip Length
Screw Tightening Torque
Rated Voltage
Display
Display Type and Size
Overrange Indication
Decimal Point
Physical/Environmental
Flashing Display with actual current
reading and display intensity change
13 45 50 Amps
8 24 30 Amps
16-22AWG, Solid or stranded
0.250 inches
3.6 pounds-inches (0.4Nm)
310Vac
3? Digit Red LED, 0.37”/9.4mm High
“1___ ”
Fixed, model dependent
(see full-scale input current)
true-rms input circuit to measure current ?owing through L1. Stated
accuracy speci?cations are measured using a sine-wave current
at, or close to, the ammeter’s full-scale input range, at nominal line
frequency of 60Hz.
2. Calibration (Potentiometer R7): Periodic recalibration of ACA-
20RM-ALM ammeters is not required under normal, indoor operating
environments. If user calibration is necessary, it must be performed
by quali?ed technical personnel. Calibration is performed with poten-
tially lethal voltages applied to the ACA-20RM-ALM and its associated
wiring. A plastic, fully-insulated adjusting tool must be used to access
the calibration potentiometer R7 located on the back of the ammeter
(see ‘Mechanical Speci?cations’ section). Contact MPS if additional
information is required regarding calibration, setup, or any other
technical issue pertaining to ACA-20RM-ALM ammeters.
3. Overcurrent Alarm Setup and Adjustment (Potentiometer R3):
ACA-20RM-ALM ammeters feature a user-settable, overcurrent visual
alarm indication which can be used to alert operators that a load cir-
cuit breaker or fuse is approaching an overload condition. When the
load current sensed by L1 exceeds this preset level, the ammeter’s
Operating Temperature
Storage Temperature
Humidity (non-condensing)
0
–40
0
—
—
—
+60
+75
85
°C
°C
%
LED display will ?ash from normal intensity to dim intensity at rate of
approximately 1.5 times per second.
As shown in Figure 3, the alarm circuit consists of jumper JP1, and
Dimensions
Weight
ACA-20RM-4-XXX-XX-ALM
ACA-20RM-5-XXX-XX-ALM
Model dependent, see page 4 & 5
1.5 Ounces (43 grams) nominal
2.1 Ounces (60 grams) nominal
adjustment potentiometer R3. As shipped, R3 is factory set to trip
when the load current is approximately 24 Amps for 30A models, and
approximately 45 Amps for 50A models. When R3 is set to its maxi-
mum clockwise position, the alarm indication will not activate until the
load current ?owing through L1 exceeds the maximum rating of the
ammeter, i.e., above 30.0A, or above 50.0A, depending on the model.
www.murata-ps.com/support
MPM_ACA-20RM-ALM.A06 Page 2 of 5
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