PWM-V Pulse Width Modulation To Voltage Transducer

P R O D U C T
D A T A
PWM-V Pulse Width Modulation To Voltage Transducer
The CSI Model PWM-V transducer provides a user
selectable to 10 Vdc or 0 to 20 Vdc output proportional to
the duration of the pulse input.
PWM-V Features
• Higher resolution than 8 bit AO
• 0 – 10 Vdc or 0 – 20 Vdc
• Dual range
0.1 – 5.2 seconds
0.1 – 25.6 seconds
• Anti-wraparound protection
Physical Description
The PWM-V is provided with a simple 3-wire electrical connection,
for control, and 2-wire electrical connection to the controlled device.
The PWM-V is 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 are displayed via a green LED and the presence of a PWM
signal from the DDC controller is indicated via a red LED.
The PWM-V may be powered by either a 24 Volt AC or DC source
to eliminate the requirement for a special transformer or power
5 SEC/25 SEC
PULSE WIDTH
SELECTION
Red LED indicates
detection of pulse input.
OUTPUT VOLTAGE
SELECTOR
10V
20V
•••
Green flashing LED
indicates power and
clock rate.
R27 D5
•
••
•
Remove R27 for MR
and I/SITE Triac inputs.
Remove both for UC
Triac inputs.
CONTROL UNIT
V G I O G
1 2 3 4 5
Pulse width
modulated output
using normally
open relay
contact or open
collector
COMMON (GROUND)
transistor or
Triac.
OUTPUT TO DEVICE
UNDER CONTROL
ANALOG INPUT
POWER
CLOCK
–
+
24V supply polarity
indication applies if
DC supply is used.
INPUT
5 J2 25
SEC • • • SEC
+24V
–GND
Common (Ground)
connection when
Triac or transistor
output is used.
PDS 102 9/94
Control Systems
International
®
P R O D U C T
Control Systems International
D A T A
PWM-V Pulse Width Modulation – Voltage Transducer
MODEL NUMBER
DESCRIPTION
COMMENTS
PWM-V1
Voltage Transducer, Pulse Width Input (5.2 or 25.6
seconds), 0 – 10 Vdc or 0 – 20 Vdc Output
With Snap-Track
supply for a single transducer. Controller 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-V 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 with the left most 2 pins providing the 5 second time base.
An input pulse of less than 0.1 second duration will be rejected by
the transducer and no change will occur in the output.
The PWM-V transducer internally limits 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-V forces the
output to 0% of scale value until receipt of the first pulse input from
the DDC controller.
0 – 20V Option
The PWM-V transducer is provided with an initial output voltage
range of 0 to 10 volt DC. The output range may be user selected to 0
to 20 volts DC by positioning the jumper plug, J1, located at the left
side of the board, to the bottom most pair. Since changing the span
from 0 – 10 to 0 – 20 may change the resultant output (0 – 20 Vdc)
accuracy by 1%, an adjustment of the span potentiometer may be
used to eliminate the error if desired.
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 VOLTAGE: 0 to 10 Vdc or 0 to 20 Vdc
OUTPUT CAPACITY: 10 mA (1K/2K ohm minimum load
impedance)
LINEARITY: 1% full scale
ENVIRONMENTAL
OPERATING TEMPERATURE: 32° to 132°F (0° to 50°C)
HUMIDITY REQUIREMENTS: 10% to 90% (non-condensing)
POWER
SUPPLY VOLTAGE: 24 to 35 Vdc @ 75 mA .18 - 28 Vac @ 150 mA
50/60 Hz
CSI Transducer Conversion Coefficients
Transducer
PWM-V
PWM-V
Resolution Counts
0-255
0-255
Input Range (seconds)
0.1-5.2
0.1-25.6
Source Range (FS)
0-100%
0-100%
M (Slope)
0.19608
0.03922
B (Intercept)
–1.96078
–0.39216
0-10
0-10
Output Range (Vdc)
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)
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 102 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
®

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