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| 型号： | ACA-20RM-5-AC3-RL-ALM-C |
| 厂商： | Murata Power Solutions Inc |
| 文件页数： | 3/5页 |
| 文件大小： | 0K |
| 描述： | AMMETER AC 30A 120V W/ALARM RED |
| 产品目录绘图： | Digital Panel Meter |
| 特色产品： | ACA-20RM-ALM Series Ammeters |
| 标准包装： | 12 |
| 系列： | ACA-20RM-ALM |
| 类型： | 安培表 |
| 测量范围： | 0 ~ 30.0A |
| 显示器样式： | 红色字符，黑色背景 |
| 显示器类型： | LED |
| 显示器位数： | 3.5 |
| 显示器位数 - 高度： | 0.370"（9.40mm） |
| 背光： | 无 |
| 安装类型： | 面板安装 |
| 端子： | 端接块 |
| 电源电压： | 85 ~ 140VAC |
| 产品目录页面： | 2856 (CN2011-ZH PDF) |
| 其它名称： | 811-1982 |
ACA-20RM-ALM Series
True-rms-AC Ammeters with Alarm Function
To adjust the overcurrent alarm set-point level:
A. Turn off power to the ACA-20RM-ALM (i.e., the power source con-
nected to TB1).
B. Carefully remove the shorting jumper across JP1 from its ‘normal
operation position’ across terminals 2 and 3 and place it across JP1
terminals 1 and 2.
C. Re-apply power to TB1 and, using a plastic insulated adjusting tool,
adjust R3 so the ammeter’s display shows the desired overcurrent
trip level in Amps.
D. Turn off power to the ACA-20RM-ALM and return JP1’a shorting
jumper back to its ‘normal operation position’ across terminals 2
and 3. Re-apply power to TB1 to resume normal operation. If pos-
sible, after the ammeter is re-con?gured for normal operation, the
load current should be slowly increased to verify the visual alarm
operates when the load current exceeds the preset level.
Please note, the load circuit does not need to be turned off to adjust the
overcurrent alarm set point. Current ?owing through L1 while JP1 is
across terminals 1 and 2 will not be measured. Once tripped, the alarm
7. Isolation: The built-in current transformer L1 provides a minimum
of 2000Vdc isolation between the load conductor and the ammeter’s
supply voltage connected to TB1.
8. Split-Core CT (Clamp-on) Models: Both 50A models feature a split-
core current transformer that can be clamped around a properly insu-
lated live conductor without having to disconnect or remove power
from the load circuit. This live-connection capability can only be used
if the load’s power source is electrically isolated (see technical note
7) 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.
BACK VIEW
A
set point function has a hysteresis of approximately 0.5A.
The overcurrent alarm function can also be adjusted with JP1 in its
normal operation position if the desired alarm overcurrent-level is
actually ?owing through L1 (i.e., with a live load). For example, with
a 20 Amp load current ?owing through L1, and with JP1 in its normal
operation position, slowly adjust R3 until the display starts ?ashing on
and off. Using this “live load” adjustment method eliminates the need
FUSED AC POWER
B
TB1
to turn off power to TB1 or recon?guring JP1.
4. Wire Gauges and Fusing: Wires speci?ed in the Functional Speci?ca-
tions section must be used for making connections to ACA-20RM-ALM
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-ALM 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 feed-
ing these power meters 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-
TO AC LOAD
BACK VIEW
L1
Figure 2. Typical wiring diagram
sions, and wires should be inserted into TB1 such that their insulation
is not pinched by the screw terminal.
5. AC Supply Polarity and Grounding: The two supply inputs, TB1-A and
TB1-B, on ACA-20RM-ALM ammeters are not in themselves polarity
sensitive, that is, they have no internal “AC LO” or “AC HI” designa-
TB1
JP1
3
2
1
R7
CAL
R3
ALARM
3
2
1
3
2
1
JP1
Normal Operation
JP1
Overcurrent
Alarm Adjustment
tions. ACA-20RM-ALM ammeters do not include or require a connec-
tion to earth/chassis ground.
Figure 3. Alarm circuit component location
6. Connector Torque Ratings: It is important to tighten TB1’s, screw-ter-
minals to their rated torque speci?cation of 3.6 pound-inches (0.4Nm).
Proper tightening will minimize connector losses and ensure safe,
reliable operation.
www.murata-ps.com/support
MPM_ACA-20RM-ALM.A06 Page 3 of 5
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| ACA-20RM-ALM_10 | 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 |
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