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How to Use This Manual
The UCM-420A is a very versatile product designed
to cover a wide variety of control applications. To
properly apply the UCM-420A, refer to the MODES
OF OPERATION (beginning on page 8) and select
the configuration you desire for your control system.
Then proceed to the section and page number indi-
cated for the proper application, wiring and set-up of
the UCM-420A.
FEATURES
• Proportional / Integral Control
• DIP switch / Jumper Programming
• Sample and Hold for Failsafe
• 6-Hour Memory on Loss of Power
• Selectable Throttling Range
• Selectable Reset Rates
• Selectable Direct- or Reverse-Acting
• 4-20 mA or 1-5 VDC* Output
• 4-20 mA, 1-5 VDC or Thermistor Input
* Requires external 250 ohm resistor
SPECIFICATIONS
Supply voltage
Remote setpoint input
Local setpoint input
PWM time base
Output
Output resolution
Output burden
Input
Input impedance
Accuracy
Operating temperature
Humidity limit
24 VAC ±10% @ 100 mA (130 mA if PWM input is used) or
24 VDC ±10% @ 50 mA (65 mA if PWM input is used)
4-20 mA, 1-5 VDC, PWM or Multiplexed PWM
4-20 mA, 1-5 VDC, three-wire potentiometer or PreCon two-wire potentiometer
0.1-2.65, 5.2, 12.85, 25.6 seconds or 0.59-2.93 seconds
4-20 mA sourcing (1-5 VDC with 250 ohm resistor)
256 steps
650 ohm maximum
4-20 mA, 1-5 VDC or PreCon Type 3 Thermistor (thermistor range 50° to 90°F)*
250 ohms (mA)/10,000 ohms (voltage)
±1%
32° to 158°F (0° to 70°C)
95% noncondensing
• Selectable Pulse-Width Time Base
• Status LED Indication
• Multiplex Input Operation
• Pulse-Width to 4-20 mA Converter
• Remote and/or Local Setpoint
• Local Setpoint Potentiometer Mounted on
Unit (Standard)
• Optional DIN Rail Mount
• Optional Setpoint Potentiometer on
Stainless Steel Plate
2
* Other ranges available
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