Specifications

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The UCS-121 can be ordered preset to the application to save time during installation. Specify the -C option for factory setup and
calibration. The UCS-121 can also be set up and calibrated in the field.
Input Jumpers
Set the input jumper for the type of input signal, mA or V, to be used. Set the action jumper for either direct DIR or reverse REV
action. See Operation for a description of direct and reverse action.
Setpoint Adjustment
1. When making adjustments, the load being controlled should be disconnected from the UCS-121 and the T.C. jumper placed in
the NODLY position.
2. Connect a meter in series with the SIG IN terminal and the 0.5-20 mA signal to read a current signal. To read a voltage input,
0.75-15 VDC, connect the meter across the COM and SIG IN terminals.
3. Turn the setpoint pot SPT fully counterclockwise to its minimum position.
4. Adjust the input signal to the desired relay trip point.
5. Turn the setpoint pot clockwise until the RELAY ON LED turns off (or turns on if the action jumper is in the REV reverse
position).
6. Adjust the relay trip point by slowly turning the setpoint pot SPT counterclockwise until the RELAY ON LED turns on (or turns
off if the action jumper is in the REV reverse position).
7. The relay trip point is now set. Verify setting by varying the input signal up and down and observing the RELAY ON LED.
8. Set the jumper to the DLY position to add a 30-second time constant or to the NODLY position for no time constant.
Differential Adjustment
The relay differential is factory set for 0.5 mA or 0.375V, which should be suitable for most applications without requiring any
adjustment. If the relay differential must be adjusted, follow these steps:
1. When making adjustments, the load being controlled should be disconnected from the UCS-121 and the T.C. jumper placed in
the NODLY position.
2. The relay setpoint should be set prior to adjusting the relay differential. See instructions above.
3. Connect a meter in series with the SIG IN terminal and the 0.5-20 mA signal to read a current signal. To read a voltage input,
0.75-15 VDC, connect the meter across the COM and SIG IN terminals.
4. Adjust the input signal to any value greater than the relay trip point setting so that the RELAY ON LED turns on (or turns off if
the action jumper is in the REV reverse position).
5. Turn the differential pot DIF fully clockwise to its maximum position.
6. Adjust the input signal to the desired relay differential value. The relay differential value should be equal to the setpoint value
minus the required relay differential. For example, if the relay setpoint is adjusted for 10V and a 1V differential is required, the
input signal should be adjusted for a input value of 9V (10V - 1V = 9V).
7. Turn the differential pot very slowly counterclockwise until the RELAY ON LED turns off (or turns on if the action jumper is in the
REV reverse position).
8. The relay differential is now set. Verify settings by varying the input signal up and down and observing the RELAY ON LED.
9. Set the jumper to the DLY position to add a 30-second time constant or to the NODLY position for no time constant.
SEQUENCER CONTROL MODULE - SINGLE STAGE
UCS-121 SERIES
ORDERING INFORMATION
CALIBRATION
MODEL DESCRIPTION
UCS-121 Sequencer control module, single stage
UCS-121-C Sequencer control module, single stage, pre-calibrated
UCS-121-H Sequencer control module, single stage, hub enclosure
UCS-121-H-C Sequencer control module, single stage, hub enclosure, pre-calibrated
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