Specifications

NEW!
TRANSDUCERS
1460
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TRANSDUCERS
23
WHEN YOU NEED IT RIGHT, RIGHT NOW, CALL KELE.
kele.com888-397-5353 USA
March 2014
Supply Voltage 24 VAC ±10%, half-wave;
or 24 VDC ±10%
Supply Current 160 mA @ 24 VAC;
80 mA @ 24 VDC maximum
Input 0-20 mA or 0-15 VDC, jumper
selectable
Input Impedance 250Ω (mA input);
49.7 kΩ (VDC input)
Wiring Terminations Screw terminals
Accuracy ±1%
Output Four SPDT relays, adjustable via
setpoint potentiometers
Relay Differential Factory set at 0.5 mA or 0.375V,
adjustable using plug-in resistors
Relay Output Rating 10A @ 120 VAC
Operating Temperature 32° to 158°F (0° to 70°C)
Operating Humidity 5% to 95% RH (non-condensing)
Weight 0.6 lb (0.25 kg)
RoHS Statement Ye s
Warranty 1 year
SEQUENCER CONTROL MODULE - FOUR STAGE
UCS-421E
DESCRIPTION
The UCS-421E is a solid-state device used for multistage
control in HVAC systems, sequencing boilers or chillers, or
floating/tri-state control of VAV boxes from a single analog
signal. The UCS-421E can be used to obtain a digital output
from a voltage or current producing sensor. Units may be
daisy chained to provide additional stages of control, and a
mounting track for easy installation.
OPERATION
The UCS-421E accepts a 0-20 mA or 0-15V input signal to
produce a four-stage relay output. Each relay has a multi-turn
potentiometer adjustment to set the pull-in point. Relays 1
and 4 can be jumper-selected to pull in on either a rise or fall
in signal. Relays 2 and 3 always pull in on a signal rise. The
UCS-421E considers an input signal below 1 mA or 0.75V to
be a loss of signal, and all relays will de-energize if the SLD
jumper is removed. If the SLD jumper is installed, the signal
loss feature is disabled and the relays in the FLT mode will
stay energized. Individual relay differential is easily adjusted
by using different value plug-in differential resistors. Multiple
UCS models can be daisy chained to operate additional
stages from one input signal. A maximum of eight slave units
can be daisy chained.
SPECIFICATIONS
2.25
(5.72)
3.66
(9.30)
Depth: 1.19
(3.02)
in
(cm)
CH
V
mA
SLD
FLT
SEQ
FLT
SEQ
1234
1 2 3 4
24V
POWER
COMMON
SIGNAL
INPUT
CHAIN
OUTPUT
FEATURES
• Four stages of relay control
• Voltage or current input
• LED indication of relay status
• Adjustable relay setpoints
• Adjustable relay differentials
• Loss of signal feature
• Snap-track mounted
DIMENSIONS