Specifications

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March 2014
SEQUENCER CONTROL MODULE - FOUR STAGE
UCS-421E
CH
V
mA
SLD
FLT
SEQ
FLT
SEQ
1234
1 2 3 4
24V
POWER
COMMON
SIGNAL
INPUT
CHAIN
OUTPUT
Plug-in Differential Resistors (1/4W, 1%)
18.2 k
Ω = 0.5 mA or 0.375V (factory supplied)
See Table 1 for other differentials.
Jumper should be in chain position (CH)
when using UCS-421E as a slave unit.
Remove jumper to enable
signal loss feature.
Chain Output is used to connect the master
unit to the first slave. Additional slaves are
connected from signal input to signal input.
Connections to UCS slave
units (max eight units)
24V Power Terminal
Common Terminal
Signal Input Terminal
24 VAC/VDC
TABLE 1. OTHER DIFFERENTIALS
Other Differential Resistors can be used
(customer-supplied):
9.1 kΩ = 0.25 mA or 0.1875V
36.5 kΩ = 1.0 mA or 0.75V
54.9 kΩ = 1.5 mA or 1.125V
73.2 kΩ = 2.0 mA or 1.5V
Signal
mA or V
+
–
+
–
Factory Relay Settings
Relay 1: 5.3 mA, 4V
Relay 2: 6.6 mA, 5V
Relay 3: 8.0 mA, 6V
Relay 4: 9.3 mA, 7V
Relay Contact Wiring
for Floating/Tri-state
Control (set #1 mode
Jumper in FLT position)
1 (3) 2 (4)
CW
CCW
COM
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-421E to the controller, shield
grounded at the controller.
WIRING
1. Set jumpers to desired position as follows:
Mode jumpers - In FLT position, Relays 1 and 4 energize on a decrease in signal. In the SEQ position, Relays 1 and 4 energize
on an increase in signal. Relays 2 and 3 always energize on an increase in signal.
Input jumpers - Select mA position for a 0-20 mA input or V position for a 0-15 VDC input. If the UCS-421E is used as a slave
unit, place the bottle plug jumper in the chain position.
2. Connect a meter in series with the SIGNAL INPUT terminal and the 0-20 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 1.
4. If Relay 1 LED is on, turn its setpoint adjustment clockwise (counterclockwise if Relay 1 has mode jumper in FLT position) until
it de-energizes; otherwise, proceed to step 5.
5. Adjust Relay 1 pull-in point by turning its setpoint adjustment counterclockwise (clockwise if Relay 1 has mode jumper in FLT
position) until the relay energizes. (The potentiometers are 25-turn potentiometers.)
6. Repeat steps 3, 4, and 5 for Relays 2, 3, and 4 using corresponding setpoint adjustments.
7. When using a 0-20 mA input, the CHAIN OUTPUT produces a 0-12 VDC signal, which is proportional to the input signal.
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
MODEL DESCRIPTION
UCS-421E Sequencer control module, four relay outputs, field calibrated
UCS-421E-C Sequencer control module, four relay outputs, pre-calibrated (specify settings when ordering)
SETUP / CALIBRATION
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