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ACA-20RM-ALM Series
True-rms-AC Ammeters with Alarm Function
PANEL INSTALLATION
All connections to ACA-20RM-ALM Series ammeters must be made after
the ammeter is securely attached to the panel and with all associated
load and supply voltages de-energized (off), using extreme caution and
observing all safety measures applicable to the user’s installation.
Care should be exercised when passing conductors through the amme-
ter’s built-in current transformer L1. The installed wire-positions should
be such that minimal mechanical forces are applied to L1, TB1, or to the
ammeter itself. In high-vibration environments, it is strongly recom-
mended that adequate strain reliefs be used for all wiring.
plastic standoffs over the bezel’s threaded studs. Install the ACA-20RM-
ALM pc-board assembly as shown and then attach and securely tighten
each of the four hex nuts to 15-20 ozf-in (0.106 to 0.140 N-m). Use only
the factory-supplied hardware as the use of substitute hardware could
result in an unsafe installation and/or adversely affect the reliability of
the ammeter.
The recommended range of panel thickness that can be used with the
supplied hardware is 0.040 inches (1.0mm) to 0.125 inches (3.2mm).
Panel thickness outside of this range will require additional user-supplied
hardware or modi?cations.
Using Figure 4 as a guide, carefully insert the bezel/color ?lter assembly
into the panel opening. From the rear of the panel, install the four round
PANEL
Gasket
Standoff
Nut
0.032 (0.8) Thick
Gasket
Standoff
0.190 (4.83)
Bezel
ACA-20RM
AC Ammeter
SIDE VIEW
Figure 4. Panel Installation
BEZEL AND PANEL CUTOUT
RECOMMENDED DRILL AND
0.187
PANEL CUTOUT DIMENSIONS
FRONT VIEW
(4.75)
1.280
(32.51)
0.69
(17.5)
1.07
(27.18)
INTERNAL CORNER RADII:
0.032 (0.81) MAX.
0.116 (2.95)
0.838
(21.29)
1.336 (33.93)
0.145 (3.68)
1.826 (46.38)
1.626 (41.30)
0.093 (2.362) DIAMETER (4 REQUIRED)
www.murata-ps.com/support
MPM_ACA-20RM-ALM.A06 Page 4 of 5
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