ACA-20PC-4-DC1-RL-C Murata Power Solutions Inc, ACA-20PC-4-DC1-RL-C Datasheet - Page 3

• Manufacturer Part Number: ACA-20PC-4-DC1-RL-C
• Description: AC Ammeter 100A CT DC Pwr
• Manufacturer: Murata Power Solutions Inc
• Type: Digital, LED-Display AC Ammeters with Built-in Current Transformersr

Specifications of ACA-20PC-4-DC1-RL-C

• Equipment Type: Digital, LED-Display AC Ammeters with Built-in Current Transformers
• Display Type: 3 - 1/2 Digit LED
• Dimensions: 2.53 in L x 1.38 in W x 0.88 in H
• Mounting Style: Panel
• Primary Voltage Rating: 40 VDC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

1. Measurement Type: ACA-20PC ac ammeters employ a full-wave-
2. Calibration: Periodic recalibration of ACA-20PC ammeters is not
3. Wire Gauges and Fusing: Wires specifi ed in the Functional Specifi -
4. AC Supply Polarity and Grounding: The two ac supply inputs,
TECHNICAL NOTES
IMPORTANT! To ensure safe and reliable operation, ACA-20PC
ammeters must be installed and serviced by qualifi ed technical
personnel. Contact DATEL if there is any doubt regarding ammeter
installation and/or operation.
rectifi ed, average responding, rms-calibrated circuit to measure the
stepped-down output of their on-board, L1 current transformer (CT) .
Stated accuracy specifi cations are measured using a sine-wave cur-
rent at or close to the specifi ed full scale input level, at nominal line
frequency.
required under normal, indoor operating environments. If user
calibration is necessary, it should be performed by qualifi ed technical
personnel. Calibration is performed with potentially lethal voltages
applied to the ACA-20PC and its associated wiring, with the specifi ed
full-scale current fl owing through the ammeter’s built-in current
transformer.
A plastic, fully insulated adjusting tool must be used to access the
recessed calibration potentiometer located on the back of the meter
(see Mechanical Specifi cations). Contact DATEL if additional informa-
tion is required regarding calibration, setup, or any other technical
issue pertaining to the ACA-20PC.
cations section must be used for making connections to ACA-20PC
Series ammeters. All power-supply and load wiring must be rated for
the supply voltages and currents they will conduct and must comply
with any code or application-mandated requirements pertaining to
the user’s specifi c installation.
ACA-20PC Series ammeters are not internally fused. Special attention
must be paid to ACA-20PC-1-AC1 (0-2A range) and ACA-20PC-2-AC1
(0-20A range) ac-powered models when their built-in auxiliary termi-
nal block connections on TB1 are used to supply power to an external
load. The input supply wires connected to both the ammeter and the
load must be fused according to the current rating of the wire gauge
being used, in accordance with applicable regulatory codes, but not
to exceed TB1’s maximum 20A rating. If TB1 is not used to supply
power to external loads, a 0.25A/250V time delay/time lag fuse must
used.
ACA-20PC-3-AC1 (0-50A range, ac-powered) and ACA-20PC- 4-AC1
(0-100A, ac-powered) models’ TB1 is to be used only for powering
the ammeters’ internal circuitry; it must not be used to supply power
to external loads. The supply wires feeding these models must be
fused with a 0.25A 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.
TB1-A and TB1-B, on ac-powered ammeters are not in themselves
polarity sensitive, that is, they have no internal "AC LO" or "AC HI"
www.murata-ps.com/dpm
PANEL INSTALLATION
5. Connector Torque Ratings: It is important to tighten TB1's screw
6. 100 Amp Model (ACA-20PC-4-XXX): This model’s built-in current
7. DC-Powered Models: DC-powered models draw minimal supply
8. Isolation: The on-board CT (L1) provides a minimum 2000Vdc
designations. Also, ac-powered ACA-20PC ammeters do not include
or require a connection to earth/chassis ground. However, in many
applications, external ac loads which are connected directly to the
ACA-20PC’s built-in auxiliary terminal blocks must be wired with
proper polarity and connected to earth/chassis ground.
terminals to their rated torque specifi cations of 4.4 pound-inches
(0.5Nm) for four-terminal ammeters (ACA-20PC-1-AC1-RL and ACA-
20PC-2-AC1-RL), and 3.6 pound-inches (0.4Nm) for two-terminal
ammeters. Proper tightening will minimize connector losses and
ensure safe, reliable operation.
transformer requires a larger panel cutout width dimension. See
Mechanical Specifi cations for more information.
currents and in most applications can be fused according to the
supply wire’s maximum amperage rating. However, be sure to check
and comply with all applicable codes and regulations to ensure
proper installation and operation.
isolation between the current-carrying conductor passing through its
primary circuit and the ammeter supply voltage connected to TB1. Of
course, this isolation rating only applies to applications in which the
load wiring (i.e., the wire passing through the CT’s center hole) does
not connect directly or indirectly to TB1-A or TB1-B.
All connections to ACA-20PC Series ammeters must be made
after the ammeter is securely attached to the panel and with all
load and supply voltages de-energized (off).
Care should be exercised when passing the load-carrying conduc-
tor through the meter’s built-in CT— particularly when larger-gauge
conductors are used. The position of the installed wire should be
such that minimal forces are applied to the built-in CT, TB1, or to
the ammeter itself. In high-vibration environments, adequate strain
reliefs be used for all load and supply wiring.
To ensure a secure panel-mount installation, DATEL recommends
using the DMS-BZL4 bezel assembly (with sealing gasket) supplied
with each ammeter. Also, please note that the ACA-20PC-4-XXX
100A oversize CT requires a larger panel-cutout width of 1.350"
(34.3mm). See Mechanical Specifi cations for detailed cutout and
ammeter dimensions.
Following the four-step sequence shown in Figure 2 below—being
careful not to apply excessive force or twisting motions—insert the
ammeter into the panel opening. When using the DMS-BZL4 bezel
assembly, install its sealing gasket so it is positioned between the
ammeter’s front fl ange and panel front surface (see Mechanical
Specifi cations). Be sure to use and securely tighten all four screws
supplied with the bezel assembly.
Digital, LED-Display AC Ammeters with
16 Feb 2011 MPM_ACA_20PC.B08 Page 3 of 6
Built-in Current Transformers
ACA-20PC Series
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