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Kele UCM-420A Operating And Installation Instructions

Setpoint controller
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April 1994
UCM-420A
Setpoint Controller
Operating and
Installation Instructions
Table of Contents
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Summary of Contents for Kele UCM-420A

  • Page 1 April 1994 UCM-420A Setpoint Controller Operating and Installation Instructions...
  • Page 2 A LARGE number of applications in a SMALL package... REMOTE SETPOINT LOCAL SETPOINT CONTROLLER CONTROLLER REMOTE SETPOINT CONTROLLER WITH 4-20 mA SIGNAL LOCAL ADJUSTMENT GENERATOR UCM-420A PULSE-WIDTH OUTPUT EXPANDER TO ANALOG CONVERTER SAMPLE AND HOLD...

  • Page 3: Table Of Contents

    About the Table of Contents UCM-420A The UCM-420A is a low-cost Section Page m i c r o p r o c e s s o r - b a s e d c o n - How to Use This Manual ........... 2 troller that uses industry-stan- Features ..............2...

  • Page 4: How To Use This Manual

    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.

  • Page 5: Installation Instructions And Dimensions

    If pur- TABS chased with the UCO-47 DIN Rail Mounting Option, mount on a DIN rail. The UCM-420A must be installed in a clean, dry location, avoiding areas of temperature extremes, corrosive vapors, or electromagnetic interfer- ence.

  • Page 6: General Wiring Instructions

    In cases where more wires are required to be connected to the common terminal block of the UCM-420A than will fit under the screw on the terminal block, connect as follows: A.
  • Page 7 General Wiring Diagrams (Cont.) GENERAL WIRING DIAGRAM 3 - Completely separate PWM and UCM-420A circuits. JUMPER PINS 24 VAC JUMPER INPUT – POSITION INPUT 24 VDC REM SPT NUMBER INPUT LOC SPT POT + CONTACT AT BAS CONTROLLER LOC SPT...
  • Page 8 GENERAL WIRING DIAGRAMS 8 & 9 - Using an analog (4-20 mA or 1-5 VDC) signal for local setpoint. Analog signals are normally used as remote setpoints. However, the UCM-420A may be configured to accept an analog signal for a local setpoint if this is required.
  • Page 9 General Wiring Diagrams (Cont.) INPUT WIRING (DIAGRAMS 10-12) GENERAL WIRING DIAGRAM 10 - GENERAL WIRING DIAGRAM 11A - PreCon Type 3 Thermistor input 4-20 mA input from a two-wire device JUMPER JUMPER PINS PINS 24 VDC JUMPER INPUT POWER JUMPER INPUT SUPPLY POSITION...

  • Page 10: Modes Of Operation - Descriptions

    When the UCM-420A is used as a remote setpoint controller, a 4-20 mA, 1-5 VDC or time-based pulse-width signal from a BAS controller sends a setpoint signal to the UCM-420A. The UCM-420A monitors a 4-20 mA, 1-5 VDC, or thermistor input from the process being controlled to provide a proportional/integral control signal to the controlled device.

  • Page 11: Local Setpoint Controller

    EXAMPLE: LOCAL SETPOINT CONTROLLER - Static Pressure Control In this example, the input to the UCM-420A is a 4-20 mA signal from a pressure transducer that monitors duct pres- sure. The setpoint is adjusted by using the setpoint potentiometer mounted on the UCM-420A. The UCM-420A then sends a 4-20 mA control signal to the VFD which controls the AHU fan speed, which in turn, determines duct pres- sure.

  • Page 12: C Remote Setpoint Controller With Local Adjustment

    Remote Setpoint Controller With Local Adjustment When the UCM-420A is used as a remote setpoint controller with local adjustment, a 4-20 mA, 1-5 VDC, or time- based pulse-width signal from a BAS controller sends a setpoint signal to the UCM-420A. The setpoint poten- tiometer on the UCM-420A or a UCM-SPA setpoint potentiometer wired to the "Local Setpoint"...

  • Page 13: D Output Expander (Multiplexed Pwm)

    UCM-420As with each group able to have a different setpoint. When operated in this mode, each UCM-420A accepts a 4-20 mA, 1-5 VDC, or thermistor input (with a range of 50 to 90°F)* from the process being controlled.

  • Page 14: E Sample And Hold

    The UCM-420A may be used to monitor and pass through a 4-20 mA or 1-5 VDC signal. If the signal being moni- tored is lost, the UCM-420A will output the last valid value for the signal until the signal returns. On a power loss, the signal is remembered up to six hours.
  • Page 15 If power is not lost, but the analog remote setpoint signal is suddenly lost (because of a loose wire or Building Automation System failure), the UCM-420A will continue to control with the previous setpoint until a valid signal returns.
  • Page 16 Set-Up Instructions (Cont.) Select the type of input to be used and set the jumper per TABLE 3. The input may be a 4-20 mA STEP or 1-5 volt signal that measures temperature, pressure, humidity, etc., or a PreCon Type 3 Thermistor.

  • Page 17: A Remote Setpoint Controller

    *NOTE: PWM contact at controller may switch either positive or negative leg of circuit, and PWM circuit may use the same power supply as the UCM-420A, or a separate power supply. See the General Wiring Diagram Section for detailed wiring.
  • Page 18 Two-wire pot* Local setpoint Positions 1 & 6 *UCM-420A comes from the factory with an integral three-wire local setpoint potentiometer. To use any other local setpoint option, installer must first remove existing three wires from local setpoint terminals on UCM-420A terminal block.
  • Page 19 The number of times per minute this offset is overcome by the output signal is the integral reset rate. If the output of the UCM-420A is used for digital control, set the integral reset rate "OFF." TABLE 9...
  • Page 20 If power is not lost, but the analog remote setpoint signal is suddenly lost (because of a loose wire or Building Automation System failure) the UCM-420A will continue to control with the previous setpoint until a valid signal returns.
  • Page 21 *NOTE: The UCM-420A comes from the factory with an integral three-wire local setpoint poten- tiometer installed and wired. To use any other local setpoint option (or three-wire potentiometer separate from the UCM-420A) installer must first remove the existing three wires from the "LOCAL SETPOINT" terminals on the UCM-420A.
  • Page 22 The number of times per minute this offset is overcome by the output signal is the integral reset rate. If the output of the UCM-420A is used for digital control, set the integral reset rate "OFF." TABLE 15...
  • Page 23 Set-Up Instructions (Cont.) WIRING DIAGRAM - UCM-420A AS A REMOTE SETPOINT CONTROLLER WITH LOCAL ADJUSTMENT LED INDICATION Steady Green - Power On Dark - Power Loss Steady Red - PWM Signal Present UCM-420A 1 2 3 4 5 6 7 8...
  • Page 24 MUX Remote setpoint, two-wire local setpoint Positions 1 & 6N In the multiplexed PWM mode, each UCM-420A is assigned an address 1-8 so that it may be inde- STEP pendently updated by the Building Automation System. Multiple UCM-420As may be assigned the same address.
  • Page 25 MULTIPLEXED OPERATION The pulse-width input is optoisolated and can accept an 24 VAC or 24 VDC signal from any source with or without a common ground. The sequence for updating a UCM-420A setpoint in the multiplexed mode is as follows: 1.
  • Page 26 Set-Up Instructions (Cont.) STEP Select the type of input to be used and set jumpers per TABLE 20. The input may be a 4-20 mA or 1-5V signal which measures temperature, pressure, humidity, etc. or a PreCon Type 3 Thermistor. TABLE 20 Input Set jumper plugs on...
  • Page 27 *NOTE: PWM contact at controller may switch either positive or negative leg of circuit, and PWM circuit may use the same power supply as the UCM-420A or a separate power supply. See the General Wiring Diagram Section for detailed wiring.

  • Page 28: E Sample And Hold

    OPERATION The UCM-420A may be used to sample an analog signal and hold the value on a loss of signal. In this mode of operation, the analog remote setpoint signal is sampled and the local setpoint and input signals are ignored. The “lost”...
  • Page 29 SET-UP OF THE UCM-420A AS A PULSE WIDTH TO 4-20 MA CONVERTER (SEE PAGE 12) The UCM-420A may be used to convert a time-based pulse-width AC or DC input signal to a 4-20 mA output signal. By using the multiplexed mode, multiple UCM-420As may be controlled by one BAS output.
  • Page 30 1.76 4.69 2.93 THIS CONCLUDES THE SET-UP OF THE UCM-420A AS A PULSE WIDTH TO 4-20 MA CONVERTER. WIRE THE UCM-420A PER THE WIRING DIAGRAM BELOW AND THE GENERAL WIRING DIAGRAMS. WIRING OF THE UCM-420A AS A PWM TO 4-20 mA CONVERTER...

  • Page 31: G 4-20 Ma Signal Generator

    UCM-420A to be calibrated before system start-up. This mode of operation supplies a 4-20 mA signal in 1 mA steps. If the UCM-420A is installed when the signal generator mode is to be used, wiring should be done in accordance with the proper wiring diagram for the mode of operation for which the UCM-420A is to be used.

  • Page 32: Ordering Information

    Local setpoint potentiometer on stainless steel plate The standard unit stocked by Kele is the UCM-420A which includes a local setpoint potentiometer and accepts a thermistor input. On large quantities (100 minimum), special configurations are available. Contact Kele for special...
  • Page 33 Post Office Box 34817 (Zip: 38184) 2975 Brother Blvd. Memphis, Tennessee 38133 Phone: 901-382-4300 Fax: 901-372-2531...

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