DATEL ACA-20PC-4-DC3-RL, ACA-20PC-4-DC3-RH, ACA-20PC-4-DC3-GS, ACA-20PC-4-DC2-RL, ACA-20PC-4-DC1-RL Datasheet

®

®

Order on-line

at www.datel.com

E156931

Features

•Built-in Current Transformers for direct measurement of 0 to 2/20/50/100 Amps

•Functionally complete:

On-board current transformers Scaling/interface circuitry Precision A/D converters

Bright red or green LED displays

•32 different models

•Subminiature, 1.38" x 0.88" package

•Easy-to-read, 0.37"/9.4mm digits

•AC powered models:

85-264Vac @ 50/60Hz

240-310Vac @ 50/60Hz

85-140Vac @ 400Hz

•"Self-powered" 85-264Vac, 2A and 20A models feature built-in load connections

•DC powered models:

+5V, +5-40V, +36-75V

• 2000V isolation; UL/CSA recognized

ACA-20PC Series

Digital, LED-Display

AC Ammeters with Built-in

Current Transformers

DATEL's new ACA-20PC Series are the first digital ac ammeters to incorporate onboard current transformers (CT’s), and they are amazingly easy to use. Simply pass the current-carrying load wire through the ACA-20PC’s on-board CT, apply power to the meter's two supply terminals, and you’re instantly measuring ac currents over one of four ranges (0-2A with 1mA resolution, 0-20A with 10mA resolution, or 0-50A and 0-100A with 100mA resolution). Absolutely no external components, such as expensive low-value shunts or 5A "donut" CT’s, are required.

Meters are ac powered (120/220/277Vac @ 50/60Hz or 120Vac @ 400Hz) or dc powered (+5V, +5-40V, or +36-75V) and impose minimal loads (50mA max. and 120mA max., respectively) on their supplies. All models employ auto-zeroing circuits, precision bandgap references, and super stable thin-film resistors for unsurpassed accuracy (±0.15%FS) and stability.

The functionally complete ACA-20PC ammeters provide all the scaling/interface circuitry to mate the CT’s output to a precision (3½ digit) A/D converter. The A/D's output goes directly to drivers for the meters’ large (0.37"/9.4mm digit height), easy-to-read, LED displays. AC-powered units have on-board AC/DC converters, and wide-range dc-powered units have on-board linear regulators. AC-powered models can be powered by the same ac supply whose current they are monitoring. The 2A and 20A, 85-264Vac, 50/60Hz ("AC1") models feature additional on-board terminal blocks to supply power to the external load. All models provide 2000Vdc isolation between the measured ac current and their power supply, and all are UL/CSA recognized.

Each meter is housed in a subminiature, 1.38" x 0.88", epoxy-encapsulated package. Total behind-the-panel installation depth is approximately 2 inches. Display color options include standard red, high-intensity red, and standard green.

CAL.

+

3½ DIGIT

A/D CONVERTER

–

+V

–V

LED DISPLAY

PRECISION

FULL-WAVE

RECTIFIER

			POWER
		CONVERTER
	BUILT-IN	A		B
	CURRENT
			+	–
	TRANSFORMER
	(L1)				TB1
	MEASURED AC
			AC or DC
	LOAD CURRENT	INPUT POWER

Figure 1. ACA-20PC Series Simplified Schematic

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

ACA-20PC Series				3 ½ D I G I T ,
Performance/Functional Specifications
Typical at TA = +25°C, unless otherwise noted.
Rated Full-Scale Current	Min.	Typ.	Max.	Units
ACA-20PC-1-XXX-XX	—	—	1.999	Amps
ACA-20PC-2-XXX-XX	—	—	19.99	Amps
ACA-20PC-3-XXX-XX	—	—	50.0	Amps
ACA-20PC-4-XXX-XX	—	—	100.0	Amps
Overcurrent Rating		1.5 x rated full-scale current
Performance
Sampling Rate		2.5 samples per second
Accuracy		±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
ACA-20PC-X-AC1-XX	85	120	264	Vac@47-99Hz
ACA-20PC-X-AC2-XX	85	120	140	Vac@350-450Hz
ACA-20PC-X-AC3-XX	240	264	310	Vac@47-99Hz
ACA-20PC-X-DC1-XX	+4.75	—	+40	Vdc
ACA-20PC-X-DC2-XX	+36	—	+75	Vdc
ACA-20PC-X-DC3-XX	+4.75	—	+5.25	Vdc
Power Supply Current
ACA-20PC-X-AC1,3-XX	—	30	50	mA@47-99Hz
ACA-20PC-X-AC2-XX	—	30	50	mA@350-450Hz
ACA-20PC-X-DC1,2-XX	—	+8	+12	mAdc
ACA-20PC-X-DC3-XX	—	+80	+120	mAdc
Power Supply Terminal Block
ACA-20PC-1-AC1-RL & ACA-20PC-2-AC1-RL
(2A and 20A ac-powered models with 4-position terminal blocks):
Wire Size & Type	12-20AWG (solid), 14-20AWG (stranded)
Insulation Strip Length			0.25 inches
Screw Tightening Torque		4.4 pound-inches (0.5Nm)
Maximum Rated Current		20A with 12AWG solid wire;
	15A with 14AWG solid or stranded wire
Maximum Rated Voltage		630V (VDE 0110-V. Group 2);
		250V (VDE 0110-V. Group 3)
ACA-20PC-X-XXX-XX
(All other ac/dc-powered models with 2-position terminal blocks):
Wire Size & Type		16-24AWG (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___"
Decimal Point		Fixed, model dependent
Physical/Environmental
Operating Temperature	0	—	+60	°C
Storage Temperature	–40	—	+75	°C
Humidity (non-condensing)	0	—	95	%
Case Material		Polycarbonate

L E D D I S P L A Y , A C A M M E T E R S

Physical/Environmental
Dimensions	1.38"W x 0.88"H Depth is model
	dependent (see Mechanical Specifications)
Weight:
ACA-20PC-1-XXX-XX	1.1 ounces (31 grams)
ACA-20PC-2-XXX-XX	1.1 ounces (31 grams)
ACA-20PC-3-XXX-XX	1.3 ounces (37 grams)
ACA-20PC-4-XXX-XX	1.5 ounces (43 grams)

The ACA-20PC-1-AC1-RL and ACA-20PC-2-AC1-RL have 4-position on-board terminal blocks. All other models have 2-position terminal blocks.

Specified full-scale currents are those passing through the built-in CT's primary (load) circuit, over the frequency of 45-450Hz. The Overcurrent Rating is a continuous rating that applies to the measured ac load current. It does not apply to any circuitry external to the meter.

Accuracy is guaranteed to the rated current.

For the ACA-20PC-2-AC1-RL, if the load is connected to the meter's on-board 4-position terminal block, the 20A full scale range requires 12AWG solid copper wire on all connections. If 14AWG solid copper wire is used, the current should be limited to 15A. See Figure 3.

All specified maximum power supply currents are steady-state values. AC-powered models can draw higher surges at initial turn-on.

Maximum reverse polarity protection on "DC1" models is –40Vdc, and –50Vdc on "DC2" models. "DC3" models provide no reverse polarity protection.

Ordering Information

ACA - 20PC - 1 - AC1 - RL

Input Range: 1 = 1.999A 2 = 19.99A 3 = 50.0A

4 = 100.0A

LED Color:

RL = Red Standard

RH = High-Intensity Red*

GS = Green Standard*

Power Supply:

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

DC2 = +36-75Vdc DC3 = +5Vdc

*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.

Technical Notes

IMPORTANT! To ensure safe and reliable operation, ACA20PC 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: ACA-20PC ac ammeters employ a full-wave- rectified, average responding, rms-calibrated circuit to measure the stepped-down output of their on-board, L1 current transformer (CT) . Stated accuracy specifications are measured using a sine-wave current at or close to the specified full scale input level, at nominal line frequency.

2.Calibration: Periodic recalibration of ACA-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 ACA-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

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

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