SCM5B33

SCM5B33 Isolated True RMS Input Modules FEATURES q INTERFACES RMS VOLTAGE (0 – 300V) OR RMS CURRENT (0 – 5A) q DESIGNED FOR STANDARD OPERATION WITH FREQUENCIES OF 45HZ TO 1000HZ (EXTENDED RANGE TO 20Khz) q COMPATIBLE WITH STANDARD CURRENT AND POTENTIAL TRANSFORMERS q INDUSTRY STANDARD OUTPUTS OF EITHER 0-1MA, 0-20mA, 4-20MA, 0-5V OR 0-10VDC q ±0.25% FACTORY CALIBRATED ACCURACY (ACCURACY CLASS 0.2) q 1500 VRMS CONTINUOUS TRANSFORMER BASED ISOLATION q INPUT OVERLOAD PROTECTED TO 480V MAX (PEAK AC & DC) OR 10A RMS CONTINUOUS q ANSI/IEEE C37.90.1-1989 TRANSIENT PROTECTION q REGULATORY COMPLIANCE (TO BE 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 with a completely isolated computer side circuit which can be floated to ±50V from Power 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 switch. If desired, the output switch can be turned on continuously by simply connecting pin 22, the Read-Enable pin to I/O Common, 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 transmission 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, with series load, is between Pin 20 (+) and Pin 19 (-). 4 +EXC ** AC Source +In IIN –In ** –EXC 4 6 3 5 2 1 3 Surge Suppression and Protection Pre-Amp, Conversion Isochopper™ Amplifier Pat Pending LPF 20 VOUT or IOUT * +V –V 19 I/O Common Isolated Computer-Side Power 22 RD EN\ Backpanel Term Block +V * Current Input Models Only ** Add Jumpers for Current Input Modules (provided with SCM5B33-06, 07) –V 17 Isolated Field-Side Power Power Oscillator +5V 16 Power Common FIGURE 1. SCM5B33 Block Diagram. DATAFORTH A Burr-Brown Company ® Call 800-444-7644 For Information and Assistance 48 SPECIFICATIONS Typical at T = +25°C and +5V power. A Module Input Signal Range Standard Frequency Range Extended Frequency Range Impedance Coupling Protection(1) Continuous (-01 thru -05) Continuous (-06 thru -07) Transient (-01 thru -05) Transient (-06 thru -07) Output Signal Range Current Limit Voltage Limit Resistance Protection Ripple and Noise (100Khz) Accuracy(3)(4) Sinusoid 50/60 Hz 45Hz to 1kHz 1kHz to 20kHz Non-Sinusoid Crest Factor = 1 to 2 Crest Factor = 2 to 3 Crest Factor = 3 to 4 Crest Factor = 4 to 5 Vs. Temperature Isolation (Common Mode) Input to Output, Input to Power Continuous Transient Output to Power Continuous Rejection (50-60Hz Common Mode) Response Time (0 to 99%) Output Enable Control Selection Time Voltage Max Logic “0” Min / Max Logic “1” Current, “0,1” Loop Voltage Load Resistance (maximum) Supply Voltage Current Sensitivity Environmental Operating Temp. Range Storage Temp. Range Relative Humidity Emissions Immunity Dimensions NOTE: SCM5B33 100mV to 300V rms, 0 to 5A rms 45Hz to 1000Hz 1kHz to 20kHz 1 MΩ ±1% shunted by 100pF (-01 thru -05), 0.10Ω (-06), 0.025Ω (-07) AC 300V rms 10A rms ANSI/IEEE C37.90.1-1989 See note 2 0-5V or 0-10V or 0-1mA or 0-20mA or 4-20mA 1.4mA (0-1mA models), 30mA (0/4-20mA models), 8mA (0-5, 0-10V models) ±18V (0-5, 0-10V models) 50Ω (0-5, 0-10V models) Continuous Short to Ground 0.025% Span rms ORDERING INFORMATION MODEL SCM5B33-01 SCM5B33-02 SCM5B33-03 SCM5B33-04 SCM5B33-05 SCM5B33-06 SCM5B33-07 SCM5B33-01B SCM5B33-02B SCM5B33-03B SCM5B33-04B SCM5B33-05B SCM5B33-06B SCM5B33-07B SCM5B33-01C SCM5B33-02C SCM5B33-03C SCM5B33-04C SCM5B33-05C SCM5B33-06C SCM5B33-07C SCM5B33-01D SCM5B33-02D SCM5B33-03D SCM5B33-04D SCM5B33-05D SCM5B33-06D SCM5B33-07D SCM5B33-01E SCM5B33-02E SCM5B33-03E SCM5B33-04E SCM5B33-05E SCM5B33-06E SCM5B33-07E INPUT* (rms) 0-100mV 0-1V 0-10V 0-150V 0-300V 0-1A 0-5A 0-100mV 0-1V 0-10V 0-150V 0-300V 0-1A 0-5A 0-100mV 0-1V 0-10V 0-150V 0-300V 0-1A 0-5A 0-100mV 0-1V 0-10V 0-150V 0-300V 0-1A 0-5A 0-100mV 0-1V 0-10V 0-150V 0-300V 0-1A 0-5A OUTPUT* (dc) 0-5V 0-5V 0-5V 0-5V 0-5V 0-5V 0-5V 0-1mA 0-1mA 0-1mA 0-1mA 0-1mA 0-1mA 0-1mA 4-20mA 4-20mA 4-20mA 4-20mA 4-20mA 4-20mA 4-20mA 0-10V 0-10V 0-10V 0-10V 0-10V 0-10V 0-10V 0-20mA 0-20mA 0-20mA 0-20mA 0-20mA 0-20mA 0-20mA ±0.25% Span ±0.25% Reading Additional Factor ±0.75% Reading Additional Factor ±0.05% Reading Additional Error ±0.15% Reading Additional Error ±0.30% Reading Additional Error ±0.40% Reading Additional Error ±100ppm/°C 1500Vrms max ANSI/IEEE C37.90.1-1989 50Vdc max 100dB