Kele UCS-621 Quick Start Manual

OUTPUT TRANSDUCERS
UNIVERSAL SEQUENCER CONTROL MODULE
MODEL UCS-621
DESCRIPTION
The Model UCS-621 is a solid-state device used for
multi-stage control in HVAC systems, sequencing boil-
ers or chillers, or floating control of VAV boxes from a
single analog signal. The UCS-621 can be used to
obtain a digital output from a voltage or current produc-
ing sensor. The UCS-621 is supplied with mounting
track for easy installation.
FEATURES
• 6 stages of relay control
• Voltage or current input
• 24 VAC or 24 VDC power
• LED indication of relay status
• Adjustable relay setpoints
• Adjustable relay differentials
• Snap-track mounted
OPERATION
The UCS-621 accepts a 0.5-20 mA or 0.375-15 VDC
signal to produce up to six stages of relay output. Each
relay has a multi-turn potentiometer adjustment to set
the pull-in point. Each of the six relays is jumper-selec-
table to pull in on either a rise or fall in signal. Individual
relay differential is easily adjusted by using different
value plug-in differential resistors. The UCS-621 consid-
ers an input signal below 0.5 mA or 0.375 V to be a loss
of signal and all relays will de-energize.
SPECIFICATIONS
Supply voltage
Input signal
Output
Relay rating
Accuracy & repeatability ±1%
Setpoint adjustment
Input impedance
KELE & ASSOCIATES • P O Box 34817 • Memphis, TN 38184
24 VAC ±10% @ 300 mA
24 VDC ±10% @ 150 mA
0.5-20 mA or 0.375-15 VDC
jumper-selectable
6 SPDT relays
5A @ 120 VAC
25-turn potentiometers
250 ½ (mA input),
30 k½ (V input)
DIMENSIONS
in
(cm)
1 2
3
1
2
1
3
2
4
3
5 4
6 5
6
SIG
(15.24)
Operating temp range
Humidity limit
Dimensions
Relay differential
Weight
901-937-4900 • FAX 901-372-2531 • E-mail info@kele.com
4 5 6
V
MA
6.0
32° to 158°F (0° to 70°C)
5-95% RH noncondensing
3.25"H x 6.0"W x 1.375"D
(8.25 cm x 15.24 cm x 3.49 cm)
0.5 mA or 0.375V
(adjustable by plug-in
differential resistors - see
wiring diagram)
0.7 lb (0.32 kg)
3.25
(8.25)