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P R O D U C T D A T A PWM-C Pulse Width Modulation to Current Transducers CSI’s Model PWM-C1 and PWM-C2 transducers provide a 4 to 20 mA and 0 to 20 mA output, respectively, proportional to the duration of the pulse input. PWM-C Features • Higher resolution than 8 bid AO • 4 – 20 mA or 0 – 20 mA • Dual range 0.1 – 5.2 seconds 0.1 – 25.6 seconds • Anti-wraparound protection Physical Description Both the PWM-C1 and PWM-C2 are provided with a simple 3-wire electrical connection, for control and 2-wire electrical connection to the controlled device. The PWM-C1 and PWM-C2 are contained on a single integrated circuit board designed for panel mounting using the supplied snap-track mounting rail. Electrical connections are terminated on a 5-position terminal strip on the bottom edge of the card for easy access. Power and clock status is displayed via a green LED and presence of a PWM signal from the DDC controller is indicated via a red LED. The PWM-C1 and PWM-C2 may be powered by either a 24-volt AC or DC source to eliminate the requirement for a special transformer or power supply for a single transducer. Controller Red LED indicates detection of pulse input. 5 SEC/25 SEC PULSE WIDTH SELECTION Green flashing LED indicates power and clock rate. INPUT 5 J2 25 SEC • • • SEC R27 D5 • •• • Remove R27 for MR 0r I/SITE Triac input. Remove both for UC Triac input. POWER CLOCK COMMON (GROUND) OUTPUT TO DEVICE UNDER CONTROL ANALOG INPUT + PDS 103 9/94 V G I O G 1 2 3 4 5 – 24V supply polarity indication applies if DC supply is used. CONTROL UNIT +24V –GND Pulse width modulated output using normally open relay contact or open collector transistor or Triac. Common (Ground) connection when Triac or transistor output is used. Control Systems International ® P R O D U C T Control Systems International D A T A PWM-C Pulse Width Modulator to Current Transducers MODEL NUMBER DESCRIPTION COMMENTS PWM-C1 Current Transducer, Pulse Width Input (5.2 or 25.6 seconds), 4 – 20 mA Output Current Transducer, Pulse Width Input (5.2 or 25.6 seconds), 0 – 20 mA Output With Snap-Track PWM-C2 pulse inputs may be created by mechanical dry contacts, solid state open collector transistors (NPN) or triacs as shown in the wiring diagram. If the input is from a Unitary Controller Triac (Triac to ground), remove resistor R10 and diode D2 as shown on diagram.If the input is from a Universal MicroRegulator or I/SITE I/O Controller Triac, remove resistor R10 only. PWM-C1 and PWM-C2 input full range time is user selectable between two jumper selectable ranges: 0.1 to 5.2 second pulse input or 0.1 to 25.6 second pulse input, to provide rapid loop response time when required. The time base is jumper selectable via a plug-on jumper labeled J2. An input pulse of less than 0.1 second duration will be rejected by the transducer and no change will occur in the input. The PWM-C1 and PWM-C2 transducers internally limit the maximum input signal to a full scale range of 255 counts and does not allow “wraparound” on pulses of longer duration than the specified or selected maximum. Upon power initialization the PWM-C1 or PWM-C2 forces the output to 0% of scale value until receipt of the first pulse input from the DDC controller. With Snap-Track POWER SUPPLY VOLTAGE: 24 to 35 Vdc @ 75 mA; 18 to 28 Vac @ 150 mA 50/60 Hz CSI Transducer Conversion Coefficients Transducer PWM-C1 PWM-C1 PWM-C2 PWM-C2 Resolution Counts 0-255 0-255 0-255 0-255 Input Range (seconds) 0.1-5.2 0.1-25.6 0.1-5.2 0.1-25.6 Source Range (FS) 0-100% 0-100% 0-100% 0-100% M (Slope) 0.19608 0.03922 0.19608 0.03922 B (Intercept) –1.96078 –0.39216 –1.96078 –0.39216 Output Range (milli amps) 4-20 4-20 0-20 0-20 Specifications: PHYSICAL DESCRIPTION PCB DIMENSIONS: 4'L x 3.25"W (10.2 cm x 8.25 cm) SNAP-TRACK DIMENSIONS: 4"L x 3.5"W (10.2 cm x 8.9 cm) TRANSDUCER INPUT PULSE DURATION: 0.1 to 25.6 seconds or 0.1 to 5.2 seconds INPUT PULSE RESOLUTION: 0.4% INPUT INTERFACE: Dry contact, triac or open collector transistor INPUT EXCITATION VOLTAGE: +15 Vdc (continued or pulsed) OUTPUT CURRENT (PWM-C1): 4 to 20 mA OUTPUT CURRENT (PWM-C2): 0 to 20 mA OUTPUT EXCITATION VOLTAGE: 13.5 Vdc (675 ohm max loop resistance) LINEARITY: 1% full scale ENVIRONMENTAL OPERATING TEMPERATURE: 32° to 132°F(0° to 50°C) HUMIDITY REQUIREMENTS: 10% to 90% (non-condensing) Information in this publication is based on specifications believed correct at the time of publication. The right is reserved to make changes in specifications and models as design improvements are introduced. PDS 103 9/94 CSI Group Headquarters PAN-AMERICAN MARKET CSI CONTROL SYSTEMS INTERNATIONAL 1625 W. Crosby Rd., Suite 100 Carrollton, Texas 75006 Phone: 972-323-1111, Fax: 972-242-0026 EUROPEAN COMMUNITY MARKET CSI Europe Unit B3, Armstrong Mall – Southwood, FARNBOROUGH GU14 ONR United Kingdom Phone: 44 1252 370900, Fax: 44 1252 372470 ASIA-PACIFIC MARKET CSI Pacific 36 Hasler Rd. Osborne Park, Western Australia 6017 Phone: 61-9-244 2799, Fax: 61-9-244 4335 www.control systems. com Control Systems International ®