Download 4-Stage

OUTPUT TRANSDUCERS
SEQUENCER CONTROL MODULE - FOUR STAGE
MODEL UCS-421
TM
A Kele Company
DESCRIPTION
The Model UCS-421 is a solid-state multi-stage device
used for floating/tri-state control of VAV boxes, or multistage control in HVAC systems from a single analog signal. The UCS-421 can be used to obtain a digital output
from a voltage or current producing sensor. In its base
configuration, the UCS-421 has four relay outputs. Units
may be “daisy chained” to provide additional stages of
control. The UCS-421 is supplied with mounting track
for easy installation.
FEATURES
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4 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
DIMENSIONS
in
(cm)
DEPTH: 1.375
(3.49)
UCS-421
MODE
FLT SEQ
INPUT
TYPE
H3
A
C
B
B
D
D
C
CH
H4
V
H5
MA
SIGNAL
INPUT
A
3.25
(8.25)
CHAIN
OUTPUT
MODE
FLT SEQ
24V
POWER
The UCS-421 accepts a 1-20 mA or 0.75-15 V input signal to produce four stages of relay output. Each relay
has a multi-turn potentiometer adjustment to set the pullin point. The “A” and “D” relays can be jumper-selected
to pull in on either a rise or fall in signal. The “B” and “C”
relays always pull in on a signal rise. The UCS-421 considers an input signal below 1 mA or 0.75 V to be a loss
of signal and all relays will de-energize. Multiple
UCS-421s and UCS-221s can be “daisy chained” to
operate additional stages from one input signal. Any
combination of UCS-221s and UCS-421s (maximum of 8
slave units) can be “daisy chained.” The chain output on
slave units produces a DC voltage output which can be
used for control of electronic actuators.
COMMON
OPERATION
5.5
(13.97)
SPECIFICATIONS
Supply voltage
24 VAC ±10% @ 200 mA
24 VDC ±10% @ 100 mA
Input signal
1-20 mA or 0.75-15 VDC
jumper-selectable
Output
4 SPDT relays
Relay rating
5A @ 120 VAC
Accuracy & repeatability ±1%
Setpoint adjustment
25-turn potentiometers
Input impedance
250 Ω (mA input),
10 kΩ (V input)
KELE • www.kele.com
Operating temp range
Humidity limit
Dimensions
Optional enclosure
Relay differential
Weight
32° to 158°F (0° to 70°C)
5-95% RH noncondensing
3.25"H x 5.5"W x 1.375"D
(8.25 cm x 13.97 cm x 3.49 cm)
B7
0.5 mA or 0.375 V
(adjustable by plug-in
differential resistors - see
wiring diagram)
0.55 lb (0.25 kg)
USA 901-937-4900 • International 901-382-6084
OUTPUT TRANSDUCERS
SEQUENCER CONTROL MODULE - FOUR STAGE
MODEL UCS-421
WIRING
Make all connections according to the diagram below or as shown on the job diagrams and in compliance with national
and local codes. Make all connections with power removed. Failure to do so could result in circuit board damage. Use
shielded #18-gauge cable for connections from the UCS-421 to the controller, shield grounded at the controller.
TABLE 1
OTHER DIFFERENTIAL
RESISTORS CAN BE USED
(CUSTOMER SUPPLIED):
9.1 k OHM = 0.25 mA OR 0.1875 V
36.5 k OHM = 1.0 mA OR 0.75 V
54.9 k OHM = 1.5 mA OR 1.125 V
73.2 k OHM = 2.0 mA OR 1.5 V
SIG LOSS LED WILL ILLUMINATE UPON
SIGNAL LOSS
MODE
MODE
FLT SEQ
FLT SEQ
H1
B A
C
INPUT
TYPE
H2
C D
B
A
UCS-421
SIG
LOSS
D
RELAY CONTACT WIRING
FOR FLOATING/TRI-STATE
CONTROL (SET MODE
JUMPER H1 OR H2 IN FLT
POSITION)
V
H5
mA
C
D
SIGNAL
INPUT
B
CHAIN
OUTPUT
A
CW
CH
H4
JUMPER H3 SHOULD BE IN CHAIN POSITION (CH)
WHEN USING UCS-421 AS A SLAVE UNIT.
CHAIN OUTPUT IS USED TO CONNECT THE MASTER
UNIT TO THE FIRST SLAVE. ADDITIONAL SLAVES ARE
CONNECTED FROM SIGNAL INPUT TO SIGNAL INPUT
B(C)
24V
POWER
A(D)
H3
COMMON
FACTORY RELAY SETTINGS
Relay A: 4 mA, 3 V
Relay B: 6.6 mA, 5 V
Relay C: 9.3 mA, 7 V
Relay D: 12 mA, 9 V
PLUG-IN DIFFERENTIAL RESISTORS (1/4W, 1%)
18.2 K OHM = 0.5 mA OR 0.375 V (FACTORY-SUPPLIED)
SEE TABLE 1 FOR OTHER DIFFERENTIALS
CCW COM
24VAC OR DC
SIGNAL
mA OR V
+
–
–
+
24 V POWER TERMINAL
COMMON TERMINAL
SIGNAL INPUT TERMINAL
CONNECTIONS TO UCS-221
OR UCS-421 SLAVE UNITS.
(MAX 8 UNITS)
INSTALLATION
SET-UP AND CALIBRATION
1. Set jumpers to desired position as follows:
• Mode jumpers (H1, H2) - In FLT position, the A and D relays energize on a decrease in signal. In the SEQ position, the A
and D relays energize on an increase in signal. The B and C relays always energize on an increase in signal.
• Input jumpers (H3, H4, H5) - Select H5 mA position for a 1-20 mA input, or H4 V position for a 0.75-15 VDC input. If the
UCS-421 is used as a slave unit, place the bottle plug jumper in the H3 chain position.
2. Connect a meter in series with the SIGNAL INPUT terminal and the 1-20 mA (+) signal to read a current signal. To read a
voltage input, connect across the COMMON (-) and SIGNAL INPUT(+) terminals.
3. Adjust the input signal to the desired pull-in current or voltage for Relay A.
4. If Relay A’s LED is on, turn its setpoint adjustment clockwise (counter-clockwise if Relay A (or D) has Mode jumper in FLT
position) until it de-energizes. Otherwise proceed to step 5.
5. Adjust Relay A pull-in point by turning its setpoint adjustment counter-clockwise (clockwise if Relay A (or D) has Mode jumper
in FLT position) until the relay energizes. (Setscrews A, B, C, & D are 25-turn potentiometers.)
6. Repeat steps 3, 4, & 5 for Relays B, C, & D using corresponding setpoint adjustments.
7. When using a 1-20 mA input, the CHAIN OUTPUT produces a 0.7 to 12 VDC signal which is proportional to the input signal.
This can be used to control electronic actuators with an impedance of 2 kΩ or larger. Connections should be made between
CHAIN OUTPUT(+) and COMMON(-). If a voltage input is used, the CHAIN OUTPUT is directly proportional to the input.
ORDERING INFORMATION
UCS-421
Sequencer Control Module - 4 Relay Outputs, Field Calibrated
UCS-421-C
Sequencer Control Module - Factory Set Custom Relay Settings
(Specify settings when ordering)
KELE • www.kele.com
USA 901-937-4900 • International 901-382-6084