ACA-20PC-2-AC2-GS 查看數據表（PDF） - DATEL Data Acquisition products

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ACA-20PC-2-AC2-GS

Digital, LED-Display AC Ammeters with Built-in Current Transformers

DATEL Data Acquisition products  

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

ACA-20PC Series

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 the ACA-20PC.

3. Wire Gauges and Fusing: Wires specified in the Functional Specifica-

tions 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 specific installation.

In particular, special attention must be paid to ACA-20PC-1-AC1-RL

and ACA-20PC-2-AC1-RL ac-powered models when their built-in

auxiliary terminal block connections (TB1) are used to supply current to

an external load. The supply wires connected to both the meter and the

load must be fused according to the current rating of the wire gauge

being used, in accordance with applicable regulatory codes. Also, wire

insulation should be stripped to within ±10% of the stated dimensions,

and wires should be inserted into TB1 such that their insulation is not

pinched by the screw terminal.

The ACA-20PC-3-ACX (0-50A range, ac-powered) and ACA-20PC-4-

ACX (0-100A, ac-powered) models’ TB1 is used only for powering the

meters' internal circuitry. It must not be used to supply current to

external loads. The supply wires feeding these meters must also be

fused according to the current rating of the wire gauge being used, in

accordance with applicable regulatory codes.

AC-powered models draw minimal steady-state supply currents (50mA

max.), and in most applications, they can be fused according to the

supply wire’s maximum amperage rating. However, these models can

draw significantly higher surge currents for brief periods when the ac

line voltage is initially applied.

Panel Installation

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 conductor

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

Step 1.

Step 2.

PANEL

PANEL

1

2

4. AC Supply Polarity and Grounding: The two ac supply inputs, 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" designa-

tions. 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.

5. Connector Torque Ratings: It is important to tighten TB1's screw

terminals to their rated torque specifications 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.

6. 100 Amp Model (ACA-20PC-4-XXX): This model’s built-in current

transformer requires a larger panel cutout width dimension. See

Mechanical Specifications for more information.

7. DC-Powered Models: DC-powered models draw minimal supply

currents (120mA max.) 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.

8. Isolation: The on-board CT (L1) provides a minimum 2000Vdc 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.

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 Specifications 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 flange and

panel front surface (see Mechanical Specifications). Be sure to use and

securely tighten all four screws supplied with the bezel assembly.

Step 3.

PANEL

3

Step 4.

PANEL

BEZEL

4

Figure 2. Panel Installation

GASKET

(optional)

DATEL, Inc., Mansfield, MA 02048 (USA) • Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 • E–mail: sales@datel.com • Internet: www.datel.com

3

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