Specifications

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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 50 mA @ 24 VAC; 25 mA maximum
@ 24 VDC
Input 0.5-20 mA or 0.75-15 VDC, jumper
selectable
Input Impedance 250Ω (mA input); 10 kΩ (VDC input)
Wiring Terminations Screw terminals
Accuracy ±1%
Time Constant 30 seconds, jumper enabled
Output One SPDT relay, factory set at 12
mA, 9 VDC; adjustable via setpoint
potentiometer
Relay Differential Factory set at 0.5 mA or 0.375V,
adjustable 0.2-2V or 0.25-3 mA
Relay Output Rating 5A @ 120 VAC
Operating Temperature 32° to 158°F (0° to 70°C)
Operating Humidity 5% to 95% RH (non-condensing)
Dimensions
UCS-121 3.3"H x 1.5"W x 1.3"D
(8.2 x 3.8 x 3.2 cm)
UCS-121-H 4.0"H x 2.3"W x 1.8"D
(10.2 x 5.7 x 4.4 cm)
Weight 0.4 lb (0.18 kg)
RoHS Statement Ye s
Warranty 18 months
SEQUENCER CONTROL MODULE - SINGLE STAGE
UCS-121 SERIES
DESCRIPTION
The UCS-121 Series is a solid-state device used to control
on/off type loads in HVAC and lighting systems from an
analog current or voltage signal. The UCS-121 can be used
to convert an analog current or voltage signal from a BAS
controller or sensor/transmitter into a SPDT digital output. The
UCS-121 is provided with a mounting track or in a hub-mount
enclosure for easy installation.
FEATURES
• One stage of relay control, SPDT
• Voltage or current input
• LED indication of relay status
• Adjustable relay setpoint
• Adjustable relay differential
• Snap-track or hub enclosure
• Jumper-enabled time constant
S
P
T
D
I
F
To
Controlled
Load
Relay ON
LED
RLY
NO
RLY
COM
RLY
NC
24 V
PWR
COM
SIG
IN
24 VAC/VDC
Signal
mA or V
+
+
_
_
DIR REV
DLY NODLY
mA V
Input Jumper
T. C. Jumper
Action Jumper
Relay N.O.
Relay N.C.
Relay
Common
WIRING
OPERATION
The UCS-121 accepts a 0.5-20 mA or 0.75-15V input signal
to produce a single-stage relay output. The relay has a single-
turn potentiometer adjustment to set the trip point. The relay
differential is factory set to 0.5 mA or 0.375V but can be
easily adjusted in the field using the single-turn differential
adjustment potentiometer on the UCS-121. With the action
jumper in the direct DIR position, the relay will energize when
the input signal increases to the setting of the setpoint pot
SPT and will de-energize when the input signal decreases
below the setting of the differential pot DIF. With the action
jumper in the reverse REV position, the relay will de-energize
when the input signal increases to the setting of the SPT
and will energize when the input signal decreases below
the setting of the DIF. To enable a 30-second time constant,
place the T.C. jumper in the DLY position. The NODLY position
removes the time constant.
SPECIFICATIONS
UCS-121