Section Page
How to Use This Manual ........................................... 2
Features ......................................................................2
Specifications ............................................................ 2
Installation Instructions and Dimensions ................3
General Wiring Instructions ......................................4
General Wiring Diagrams ..........................................4
Modes of Operation - Descriptions
A Remote Setpoint Controller ..............................................8
B Local Setpoint Controller ..................................................9
C Remote Setpoint Controller with Local Adjustment ..........10
D Output Expander (Multiplexed PWM) ...............................11
E Sample and Hold ..............................................................12
F PWM to 4-20 mA Converter (Single Unit or Multiplexed) 12
G 4-20 mA Signal Generator ............................................... 12
Set-up Instructions
A Remote Setpoint Controller ..............................................13
B Local Setpoint Controller ..................................................16
C Remote Setpoint Controller with Local Adjustment...........18
D Output Expander (Multiplexed PWM) ...............................22
E Sample and Hold ..............................................................26
F PWM to 4-20 mA Converter (Single Unit or Multiplexed) 27
G 4-20 mA Signal Generator ............................................... 29
Ordering Information .................................................30
1
About the
UCM-420A
The UCM-420A is a low-cost
microprocessor-based con-
troller that uses industry-stan-
dard 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
KELE
P.O. Box 34817
Memphis, TN 38184
Phone: 901-382-4300
FAX: 901-372-2531
