ACA5-20PC-1-AC3-RH 查看數據表（PDF） - DATEL Data Acquisition products
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ACA5-20PC-1-AC3-RH Datasheet PDF : 5 Pages
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5 A I N P U T, 3½ D I G I T, L E D D I S P L AY, A C A M M E T E R S
ACA5-20PC Series
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. TB1 is to be used only for powering
the meter’s internal circuitry. It must not be used to supply current
to external loads.
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.
4. AC Supply Polarity and Grounding: The two supply inputs, TB1-A
and TB1-B, on all ac-powered ACA5-20PC ammeters are not in
themselves polarity sensitive, that is, they have no internal "AC LO" or
"AC HI" designations. Also, ac-powered ACA5-20PC ammeters do not
include or require a connection to earth/chassis ground.
5. Connector Torque Ratings: It is important to tighten TB1's, screw-
terminals to their rated torque specification of 3.6 pound-inches
(0.4Nm). Proper tightening will minimize connector losses and ensure
safe, reliable operation.
6. 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.
7. Isolation: The on-board CT (L1) provides a minimum 2000Vdc
Panel Installation
All connections to ACA5-20PC 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 conductors through the
ammeter’s built-in CT. The installed wire positions should be such that
minimal forces are applied to the built-in CT, TB1, or to the ammeter
itself. In high-vibration environments, proper strain reliefs be used for
all load and supply wiring.
To ensure a secure panel-mount installation, DATEL recommends
Step 1.
PANEL
Step 2.
PANEL
1
2
isolation between the current-carrying conductor passing through its
primary circuit and the ammeter supply voltage connected to TB1.
This isolation rating only applies to applications in which the load
wiring (i.e., the wire passing through L1’s center hole) does not
connect directly or indirectly to TB1-A or TB1-B.
8. CT Precautions: In normal operation, a 5A current transformer’s
secondary circuit operates at a very low voltage due to its closed-loop
operation and its low burden resistance. However, a CT can still
generate potentially lethal voltages if its output current is suddenly
interrupted. For example, loose CT secondary connections can cause
a condition referred to as “inductive kick". Inductive kick can generate
extremely high voltages across intermitent secondary connections.
Therefore, implementing connections to any 5A current
transformer’s output leads must only be performed with zero
load-current, that is, with no power applied to the load circuit.
9. CT Connections and Grounding: Some applications require
connecting one of the external 5A CT’s output leads to earth/chassis
ground. In the USA, consult the latest revision of the National
Electrical Code (NEC) for more information regarding CT grounding.
After all mechanical assembly is completed, connect the two output
leads of the external 5A CT to each other after they are run through
L1’s center hole. Pressure-style connectors (commonly refered to as
“wire nuts”) are acceptable as long as they are rated for the number of
conductors and voltage invloved.
10. Replacing Analog Panel Meters: ACA5-20PC ammeters can be
used as direct replacements for analog panel meters driven by 5A
CT’s. All wiring operations must be performed with both the load and
the supply power sources completely de-energized.
using the DMS-BZL4 bezel assembly (with sealing gasket) supplied
with each ammeter. See Mechanical Specifications for detailed cutout
and ammeter dimensions.
Following the four-step sequence shown in Figure 2 —being careful
not to apply excessive force or twisting motions—insert the ammeter
into the panel opening. When using the DMS-BZL4, 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
GASKET
(optional)
Figure 2. Panel Installation
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
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