DATEL ACA5-20PC-9-DC3-RL, ACA5-20PC-9-DC3-RH, ACA5-20PC-9-DC3-GS, ACA5-20PC-9-DC2-RL, ACA5-20PC-9-DC1-RL Datasheet

DATEL, Inc., Mansfield, MA 02048 (USA) • Tel: [phone] Fax: [phone] • E–mail: [e-mail] • Internet: www.datel.com

ACA5-20PC Series

ACA5-20PC Series AC Ammeters are designed to scale and digitally display the
output of standard, 5A-output current transformers (50:5A, 500:5A, 1000:5A, etc.).
Simply pass the secondary/output wires of the "primary" CT through the ACA5-20PC's
on-board CT, apply power to the meter, and you're instantly measuring ac currents over
one of 14 ranges from 0-50A (with 100mA resolution) to 0-2000A (with 1A resolution).
Because they accept outputs from previously installed high-current CT's, ACA5-20PC's
can instantly bring modern digital precision to older ac ammeters.

The functionally complete ACA5-20PC ammeters incorporate scaling/interface
circuitry to mate the on-board CT to a precision (3½ digit) A/D converter. The A/D's
output directly drives the meters' large (0.37"/9.4mm digit height), easy-to-read, LED
displays. All models employ auto-zero circuits, precision bandgap references, and super
stable metal-film resistors for unsurpassed accuracy (±0.15%FS) and stability.

ACA5-20PC meters are either ac (120/220/277Vac @ 50/60Hz or 120Vac @ 400Hz)
or dc (+5V, +5-40V, or +36-75V) powered. AC models can be powered by the same ac
supply whose current they are monitoring. All ACA5-20PC's provide 2000Vdc isolation
between the measured ac current and their power supply, and all models are UL/CSA
recognized.

Each meter is housed in a subminiature, 1.38" x 0.88", epoxy-encapsulated package
whose behind-the-panel installation depth is 2 inches. Display color options include
standard red, high-intensity red, and standard green. Each meter is supplied with a
plastic bezel assembly with sealing gaskets (DATEL DMS-BZL4).

Digital-Readout

LED-Display

50-2000A AC Ammeters

Figure 1. ACA5-20PC Series Simplified Schematic

Features

• Scales and displays the output of 50:5A to

2000:5A current transformers

• 14 ranges (0-50 Amp to 0-2000 Amp)

• 3 LED options, 6 power options, 112 models

• Functionally complete:

On-board 5A current transformers
Scaling/interface circuitry
Precision A/D converters
Bright red or green LED displays

• Subminiature, 1.38" x 0.88" package

• Easy-to-read, 0.37"/9.4mm digits

• AC powered models: 120Vac @ 400Hz,

120/220/277Vac @ 50/60Hz

• AC models can be "self-powered"

• DC powered models: +5V, +5-40V, +36-75V

• 2000V isolation; UL/CSA recognized

• Digital replacements for analog ammeters

®

®

AC or DC

INPUT POWER

3½ DIGIT

A/D CONVERTER

+V –V

–

+

PRECISION
FULL-WAVE

RECTIFIER

CAL.

BUILT-IN

0-5A CURRENT

TRANSFORMER

LED DISPLAY

POWER

CONVERTER

TB1

A B

–+

(L1)

OUTPUT FROM 50:5A

TO 2000:5A EXTERNAL

CURRENT TRANSFORMER

E156931

Order on-line
at www.datel.com

2

DATEL, Inc., Mansfield, MA 02048 (USA) • Tel: [phone] Fax: [phone] • E–mail: [e-mail] • Internet: www.datel.com

ACA5-20PC Series

5A INPUT, 3½ DIGIT, LED DISPLAY, AC AMMETERS

Performance/Functional Specifications

Typical at TA = + 25°C, unless otherwise noted.

Technical Notes

IMPORTANT! To ensure safe and reliable operation, ACA5-20PC
ammeters must be installed and serviced by qualified technical
personnel. Contact DATEL if there is any doubt regarding
ammeter installation and/or operation.

1. Measurement Type: ACA5-20PC ac ammeters employ a full-wave-

rectified, average responding, rms-calibrated circuit to measure the
stepped-down output of their built-in L1 current transformer (CT) .
Stated accuracy specifications are measured using a sine-wave
current at or close to the full-scale input level, at nominal line
frequency.

2. Calibration: Periodic recalibration of ACA5-20PC ammeters is not
required under normal, indoor operating environments. If user
calibration is necessary, it should be performed by qualified technical
personnel. Calibration is performed with potentially lethal voltages
applied to the ACA5-20PC and its associated wiring, with the specified
full-scale current flowing 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 Specifications). Contact DATEL if additional
information is required regarding calibration, setup, or any other
technical issue pertaining to ACA5-20PC ammeters.

3. Wire Gauges and Fusing: Wires specified in the Functional
Specifications section must be used for making connections to ACA5­20PC 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 specific installation.

Rated Full-Scale Current ➀ Min. Typ. Max. Units
All Models — — 5.0 Amps
Overcurrent Rating ➀ 1.5 x rated full-scale current
Performance
Sampling Rate 2.5 samples per second
Accuracy ➁ ±0.15%FS ±6 counts
Measurement Type Sine wave input, full-wave

averaging, rms calibrated

Temperature Drift (0 to +60°C) — ±0.2 ±0.4 Counts/°C
Zero-Current Reading -001 000 001 Counts
Dielectric Withstanding Voltage 2000 — — Vdc
Power Supply Voltage ➂

ACA5-20PC-X-AC1-XX 85 120 264 Vac@47-99Hz
ACA5-20PC-X-AC2-XX 85 120 140 Vac@350-450Hz
ACA5-20PC-X-AC3-XX 240 264 310 Vac@47-99Hz
ACA5-20PC-X-DC1-XX +4.75 — +40 Vdc
ACA5-20PC-X-DC2-XX +36 — +75 Vdc
ACA5-20PC-X-DC3-XX +4.75 — +5.25 Vdc

Power Supply Current ➃

ACA5-20PC-X-AC1,3-XX — 30 50 mA@47-99Hz
ACA5-20PC-X-AC2-XX — 30 50 mA@350-450Hz
ACA5-20PC-X-DC1,2-XX — +8 +12 mAdc
ACA5-20PC-X-DC3-XX — +80 +120 mAdc

Power Supply Terminal Block
Wire Size & Type 16-22AWG (solid or stranded)
Insulation Strip Length 0.25 inches
Screw Tightening Torque 3.6 pound-inches (0.4Nm)
Maximum Rated Voltage 310Vac
Display
Display Type and Size 3½ digit LED, 0.37"/9.4mm digit height
Overrange Indication "1___"
Display Reading/Decimal Point Model dependent. See Ordering Info.
Physical/Environmental
Operating Temperature 0 — +60 °C
Storage Temperature –40 — +75 °C
Humidity (non-condensing) 0 — 95 %
Case Material Polycarbonate
Dimensions 1.38"W x 0.88"H Depth is model

dependent (see Mechanical Specifications)

Weight (all models) 1.1 ounces (31 grams)

➀ The specified Full-Scale Current is the current carried by the single wire passing through the

center hole of the ACA5-20PC's on-board CT. It is not the load current ultimately being
measured. the Overcurrent Rating is a continuous rating that applies to the Full-Scale
Current. It does not apply to any circuitry external to the meter.

➁ Listed accuracy specifications apply over the range of the Rated Full-Scale Current over

frequencies of 45-450Hz.

➂ Maximum reverse polarity protection on "DC1" models is –40Vdc, and –50Vdc on "DC2"

models. "DC3" models provide no reverse polarity protection.

➃ All specified maximum power supply currents are steady-state. AC-powered models can

draw larger surges at initial turn on.

Ordering Information

Order on-line at www.datel.com

ACA5 - 20PC - 1 - AC1 - RL

1 = 50.0A
2 = 75.0A
3 = 100.0A
4 = 150.0A
5 = 199.9A
6 = 250A
7 = 300A
8 = 400A
9 = 500A
10 = 600A
11 = 750A
12 = 1000A
13 = 1500A
14 = 1999A

RL = Red Standard
RH = High-Intensity Red*
GS = Green Standard*

AC1 = 85-264Vac@50/60Hz
AC2 = 85-140Vac@400Hz
AC3 = 240-310Vac@50/60Hz
DC1 = +5-40Vdc
DC2 = +36-75Vdc
DC3 = +5Vdc

Input Range:

LED Color:

Power Supply:

*

Available on "DC3" +5V

powered models only

Accessories: DMS-20-CP Panel cutout punch

A DMS-BZL4 bezel assembly with sealing gasket is supplied with each ammeter.