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參數資料
| 型號： | SCM5B33-07B |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Isolated True RMS Input Modules |
| 中文描述： | 真有效值隔離輸入模塊 |
| 文件頁數： | 1/2頁 |
| 文件大小： | 26K |
| 代理商： | SCM5B33-07B |
DATAFORTH
48
Call 800-444-7644
For Information and Assistance
SCM5B33
Isolated True RMS Input Modules
FEATURES
G
INTERFACES RMS VOLTAGE (0 – 300V) OR RMS CURRENT (0 – 5A)
G
DESIGNED FOR STANDARD OPERATION WITH FREQUENCIES OF
45HZ TO1000HZ (EXTENDED RANGE TO20Khz)
G
COMPATIBLE WITH STANDARD CURRENT AND POTENTIAL
TRANSFORMERS
G
INDUSTRY STANDARD OUTPUTS OF EITHER 0-1MA, 0-20mA,
4-20MA, 0-5V OR 0-10VDC
G
±
0.25% FACTORY CALIBRATED ACCURACY (ACCURACY CLASS
0.2)
G
1500 VRMS CONTINUOUS TRANSFORMER BASED ISOLATION
G
INPUT OVERLOAD PROTECTED TO480V MAX (PEAK AC & DC) OR
10A RMS CONTINUOUS
G
ANSI/IEEE C37.90.1-1989 TRANSIENT PROTECTION
G
REGULATORY COMPLIANCE (TOBE DETERMINED)
DESCRIPTION
Each SCM5B33 True RMS input module provides a single channel of AC
input which is converted to its True RMS dc value, filtered, isolated,
amplified, and converted to a standard process voltage or current output
(Figure 1).
The SCM5B modules are designed wth a completely isolated computer side
circuit which can be floated to
±
50V fromPower Common, pin 16. This
complete isolation means that no connection is required between I/O
Common and Power Common for proper operation of the output swtch. If
desired, the output swtch can be turned on continuously by simply connecting
pin 22, the Read-Enable pin to I/OCommon, pin 19.
The field voltage or current input signal is processed through a pre-amplifier
and RMS converter on the field side of the isolation barrier. The converted dc
signal is then chopped by a proprietary chopper circuit and transferred across
the transformer isolation barrier, suppressing transmssion of common
mode spikes and surges. The computer side circuitry reconstructs, filters and
converts the signal to industry standard outputs. Modules are powered from
+5VDC,
±
5%.
For current output models an external loop supply is required having a
compliance voltage of 14 to 48VDC. Connection, wth series load, is between
Pin 20 (+) and Pin 19 (-).
FIGURE 1. SCM5B33 Bock Dagram
**
AC Source
–In
**
**
–EXC
Backpanel
Term Block
6
5
3
Surge
Suppression
and
Protection
Pre-Amp,
Conversion
*
* Current Input Models Only
Add Jumpers for Current Input Modules
(provided with SCM5B33-06, 07)
Isolated
Field-Side
Power
4
3
2
1
+EXC
–V
+V
I
IN
4
–V
LPF
+V
Power
Oscillator
Isolated
Computer-Side
Power
V
OUT or
I
OUT
20
22
I/O Common
RD EN\
+5V
17
16
Power Common
19
Isochopper
Amplifier
Pat Pending
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