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About the
UCM-420A
The UCM-420A is a low-cost
m i c r o p r o c e s s o r - b a s e d c o n -
troller that uses industry-stan-
d a r d 4-20 mA or 1-5 VDC
input/output signals to provide
stand-alone P/I control or output
expansion.
When used as a Stand-Alone
Controller with Local Setpoint,
the UCM-420A provides propor-
tional/integral control of VFDs,
valves, actuators, or any device
that accepts a 4-20 mA or 1-5 VDC
signal. Input may be 4-20 mA,
1-5 VDC, or PreCon Type 3
Thermistor.
When used as a Stand-Alone
Controller with Remote Setpoint
for P/I control, the setpoints
may be adjusted by a 1-5 VDC,
4-20 mA, or pulse-width modu-
lated signal.
When used as a Remote
Setpoint Controller with Local
Adjustment, the remote setpoint
can have 100% control, or can
establish a base setpoint with the
local setpoint having a ±12.5%
adjustment.
When used as an Output
Expander, one AC or DC time-
based PWM signal can control up
to eight groups of UCM-420As
independently. This produces
eight analog outputs from one
PWM controller output. Five
common jumper-selectable time
bases are available.
Table of Contents
Section
How to Use This Manual ........................................... 2
Features ......................................................................2
Specifications ............................................................ 2
Installation Instructions and Dimensions ................3
General Wiring Instructions ......................................4
General Wiring Diagrams .......................................... 4
Remote Setpoint Controller ..............................................
B
Local Setpoint Controller ..................................................
Output Expander (Multiplexed PWM) ...............................
Sample and Hold ..............................................................
F
PWM to 4-20 mA Converter (Single Unit or Multiplexed)
G 4-20 mA Signal Generator ...............................................
Set-up Instructions
A
Remote Setpoint Controller ..............................................
B
Local Setpoint Controller ..................................................
C
Remote Setpoint Controller with Local Adjustment...........
D
Output Expander (Multiplexed PWM) ...............................
E
Sample and Hold ..............................................................
F
PWM to 4-20 mA Converter (Single Unit or Multiplexed)
G 4-20 mA Signal Generator ...............................................
Ordering Information ................................................. 30
KELE
P.O. Box 34817
Memphis, TN 38184
Phone: 901-382-4300
FAX: 901-372-2531
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