Specifications

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March 2014
SEQUENCER CONTROL MODULE - EIGHT STAGE
UCS-821E
CH
V
mA
SEQ FLT SEQ FLT
34512 6 78
SEQ FLT SEQ FLT
321 4 5 6 7 8
24V
POWER
COMMON
SIGNAL
INPUT
CHAIN
OUTPUT
Connections to UCS slave
units (max eight units)
24V Power Terminal
Common Te rminal
Signal Input Te rminal
24 VAC/VDC
Signal
mA or V
+
–
+
–
FLT
SEQ
Plug-in Differential Resistors (1/4W, 1%)
18.2 kΩ = 0.5 mA or 0.375V (factory supplied)
See Ta ble 1 for other differentials.
Jumper should be in chain position (CH)
when using UCS-821E 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.
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 5: 10.7 mA, 8V
Relay 6: 12.0 mA, 9V
Relay 7: 13.3 mA, 10V
Relay 8: 14.7 mA, 11V
Relay Contact Wiring
for Floating/Tri-state
Control (set #1 mode
Jumper in FLT position)
1 2
CW
CCW
COM
TABLE 1. OTHER DIFFERENTIALS
Other differential resistors can be used
(customer-supplied):
9.1 k
Ω = 0.25 mA or 0.1875V
36.5 k
Ω
= 1.0 mA or 0.75V
54.9 kΩ = 1.5 mA or 1.125V
73.2 k
Ω = 2.0 mA or 1.5V
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-821E to the controller, shield grounded at the controller.
WIRING
1. Set jumpers to desired position as follows:
Mode jumpers - In FLT position, the relays energize on a decrease in signal. In the SEQ position, the relays 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-821E 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 through 8 using 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-821E Sequencer control module, eight relay outputs, field calibrated
UCS-821E-C Sequencer control module, eight relay outputs, pre-calibrated (specify settings when ordering)
SETUP / CALIBRATION