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ACA-20RM Series
True-RMS-AC Ammeters with Built-in CT
The calibration potentiometer has approximately ? of a turn of rotation;
do not force its adjustment screw past the end stops. Contact MPS if
additional information is required regarding calibration, setup, or any
other technical issue pertaining to ACA-20RM ac ammeters.
3. Wire Gauges and Fusing : Wires speci?ed in the Functional Speci?-
cations section must be used for making connections to ACA-20RM
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 speci?c installation.
ACA-20RM ammeters are not internally fused. Terminal block TB1 is to
be used only for powering the ammeter’s internal circuitry; it must not
be used to supply power to external loads. The supply wires feeding
these ammeters must be fused with a 0.25A/250V time delay/time lag
fuse, in accordance with applicable regulatory codes.
Wire insulation must be stripped to within ±10% of the stated dimen-
sions, and wires should be inserted into TB1 such that their insulation
is not pinched by the screw terminal.
4. AC Supply Polarity and Grounding : The two supply inputs, TB1 ‘A’ and
‘B’, on ACA-20RM ammeters are not polarity sensitive, that is, they have
no ‘AC LO’ or ‘AC HI’ designations. Also, ac-powered ACA-20RM amme-
ters do not include or require a connection to earth/chassis ground.
WIRING DIAGRAMS
First pass and carefully dress one external load wire through L1, then
connect the AC supply and load wires to TB1 as shown. Ensure all wires
are stripped and properly tightened. For accurate operation, make only
BACK VIEW
5. Connector Torque Ratings : Be sure to tighten TB1’s screw-terminals
to 3.6 pound-inches (0.4Nm). Proper tightening will ensure reliable
long-term operation.
6. Isolation : The on-board CT (L1) provides a minimum of 2000Vdc iso-
lation between the current-carrying load conductor passing through
its opening and the ammeter’s power source that’s connected to TB1.
Of course, this isolation rating applies only to applications where the
load wire does not connect directly or indirectly to TB1-A or TB1-B
(i.e., where two different ac supplies are involved).
7. Split-Core CT (Clamp-on) Models : 50A models feature a split-core
current transformer that can be clamped around a current-carrying
load conductor without having to disconnect or remove power from
the load’s power source. This live-connection capability can only
be used if the load’s power source is isolated (see technical note?6)
from the ammeter’s own power source that’s connected to TB1.
The ammeter’s ac power supply must always be denergized before
making connections to TB1. Refer to the ‘Panel Installation’ section of
this data sheet for additional information.
one pass with load wire through the on-board CT (only one primary turn).
For split-core CT models, make sure to fully engage the CT's Locking
mechanism
BACK VIEW
A
FUSED AC POWER
A
TB1
FUSED AC POWER
B
TB1
B
TO AC LOAD
L1
L1
TO AC LOAD
FROM AC SUPPLY
Figure 2. Connections for pc-board mounted CT's
FROM AC SUPPLY
Figure 3. Connection for ?ying lead CT's
www.murata-ps.com/dpm
email: sales@murata-ps.com
MPM_ACA-20RM_B08 Page 3 of 5
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相关代理商/技术参数
ACA-20RM-4-AC4-RL 制造商:Murata Power Solutions 功能描述:True-RMS-AC Ammeters With Built-In CT
ACA-20RM-4-AC4-RL-ALM-C 功能描述:数字面板表 50A rng, 170-264Vac 3.5 Dig brght rd LED RoHS:否 制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM
ACA-20RM-4-AC4-RL-C 功能描述:数字面板表 50AInput TrueRMS-AC RoHS:否 制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM
ACA-20RM-5-AC3-RL-ALM-C 功能描述:数字面板表 30A rng, 85-140Vac 3.5 Dig brght rd LED RoHS:否 制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM
ACA-20RM-5-AC3-RL-C 功能描述:数字面板表 30AInput TrueRMS-AC RoHS:否 制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM
ACA-20RM-5-AC4-RL-ALM-C 功能描述:数字面板表 30A rng, 170-264Vac 3.5 Dig brght rd LED RoHS:否 制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM
ACA-20RM-5-AC4-RL-C 功能描述:数字面板表 30AInput TrueRMS-AC RoHS:否 制造商:Murata Power Solutions 设备类型:AC Voltmeters 显示器类型:LED, 3 Digit, Red 工作电源电压:85 VAC to 264 VAC 工作电源电流:50 mArms 输入电流:50 mA 输入频率: 输入电压:120 VAC 系列:DMS-20PC-1-LM
ACA-20RM-ALM 制造商:MURATA-PS 制造商全称:Murata Power Solutions Inc. 功能描述:True-rms-AC Ammeters with Alarm Function