Kele UCS-621 User manual

UNIVERSAL SEQUENCER CONTROL MODULE
MODEL UCS-621
OUTPUT TRANSDUCERS
KELE & ASSOCIATES • P O Box 34817 • Memphis, TN 38184 901-937-4900 • FAX [phone] • E-mail [email protected]
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.
Supply voltage 24 VAC ±10% @ 300 mA
24 VDC ±10% @ 150 mA
Input signal 0.5-20 mA or 0.375-15 VDC
jumper-selectable
Output 6 SPDT relays
Relay rating 5A @ 120 VAC
Accuracy & repeatability ±1%
Setpoint adjustment 25-turn potentiometers
Input impedance 250 ½(mA input),
30 k½(V input)
Operating temp range 32° to 158°F (0° to 70°C)
Humidity limit 5-95% RH noncondensing
Dimensions 3.25"H x 6.0"W x 1.375"D
(8.25 cm x 15.24 cm x 3.49 cm)
Relay differential 0.5 mA or 0.375V
(adjustable by plug-in
differential resistors - see
wiring diagram)
Weight 0.7 lb (0.32 kg)
SPECIFICATIONS
SIG
1
2
3
4
5
6
1
2
3
4
5
6MA
V
6
12345
3.25
(8.25)
6.0
(15.24)
DIMENSIONS
in
(cm)

UNIVERSAL SEQUENCER CONTROL MODULE
MODEL UCS-621
OUTPUT TRANSDUCERS
KELE & ASSOCIATES • P O Box 34817 • Memphis, TN 38184 901-937-4900 • FAX [phone] • E-mail [email protected]
SIG
1
2
3
4
5
6
1
2
3
4
5
6MA
V25-TURN
ADJUSTMENT
POT - ONE FOR
EACH RELAY
FACTORY SET TO
20 mA (ALL RELAYS)
RELAY LED - ON
WHEN RELAY
IS ENERGIZED
ONE LED PER
RELAY
TO CONTROLLED DEVICES
SET JUMPERS FOR
RELAY TO ENERGIZE
ON A DECREASE OR
INCREASE IN SIGNAL PLUG-IN DIFFERENTIAL
RESISTORS (1/4W, 1%)
9.1 K OHM = 0.5 mA OR 0.375 V
(FACTORY - SUPPLIED)
SIGNAL LED - ON
WHEN SIGNAL IS
PRESENT
24VAC
OR
24VDC
POWER
MILLIAMP OR VOLTAGE
INPUT JUMPER
= INCREASE IN SIGNAL
= DECREASE IN SIGNAL
EXAMPLE:
1-3 SET TO ENERGIZE
ON INCREASE IN SIGNAL
4-6 SET TO ENERGIZE
ON DECREASE IN SIGNAL
123456
SIG IN (+)
COM (-)
24V
SIGNAL
mA or V
123456
OTHER DIFFERENTIAL RESISTORS
CAN BE USED (CUSTOMER-SUPPLIED):
18.2 K OHMS = 1.0 mAOR 0.75V
27.4 K OHMS = 1.5 mAOR 1.125V
36.5 K OHMS = 2.0 mAOR 1.5V +
–+
–
WIRING
SET-UP AND CALIBRATION
Set jumpers to desired position as follows:
1. SIG jumpers (1-6) - In the lpositions, each relay energizes on a decrease in signal. In the jpositions, each
relay energizes on an increase in signal.
Input jumpers (V, mA) - Select mA position for a 0.5-20 mA input, or V position for a 0.375-15 VDC input.
2. Connect a meter in series with the SIG IN (+) terminal and the 0.5-20 mA (+) signal to read a current input. To
read a voltage input, connect across COM (-) and SIG IN (+). SIG LED will illuminate when signal is present.
3. Adjust the input signal to the desired pull-in current or voltage for Relay 1.
4. If Relay 1 LED is on, turn its setpoint adjustment clockwise (counter-clockwise if “SIG” jumper is set to “decrease
in signal”) until it de-energizes. If Relay 1 LED is off, proceed to step 5.
5. Adjust Relay 1 pull-in point by turning its setpoint adjustment counter-clockwise (clockwise if relay “SIG” jumper
is set to “increase in signal”) until the relay energizes.
(Setscrews 1-6 are 25-turn potentiometers.)
6. Repeat steps 3, 4, & 5 for Relays 2-6 using corresponding setpoint adjustments.
INSTALLATION
UCS-621 Universal Sequencer Control Module - 6 Relay Outputs, field calibrated
UCS-621-C Universal Sequencer Control Module - Factory Set Custom Relay Settings
(Specify settings when ordering)
ORDERING INFORMATION
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-621 to the controller, shield grounded at the controller.