The Dynisco UPR900 and ATC990 are advanced process indicators and controllers designed for industrial applications, particularly those involving pressure and temperature management. These devices share a common hardware platform and many features, with the ATC990 offering additional control capabilities.
Function Description
The UPR900 Indicator is a 1/4 DIN (96x96mm) sized device, with a depth of 117mm behind the panel. Its primary function is to indicate and display various process parameters such as pressure, temperature, or other measured values. It can accept one or two inputs for this purpose. The device features a graphical display with 80 x 160 pixels and a red/green color-changing backlight, providing clear visual feedback. It offers flexible output and option combinations, including a data recorder and a USB port for data management.
The ATC990 Controller builds upon the UPR900's features by adding single-loop PI/PID control. It operates in two distinct modes: Pressure mode and Temperature/standard PID mode.
- Pressure mode is specifically tailored to Dynisco's core business needs, offering specialized options, features, tuning, and calibration for pressure applications. It also supports differential pressure control with an optional second input.
- Temperature/standard PID mode provides features suitable for more general applications, most commonly temperature control (single PID for heating or dual PID for heating and cooling), but can also be used for other parameters like %RH or pH.
Important Technical Specifications
- Dimensions: 1/4 DIN (96x96mm) size, 117mm depth behind the panel.
- Display: Graphical, 80 x 160 pixels, with red/green color change backlight.
- Inputs: 1 or 2 inputs for indication/display. Input types include Strain gauge, linear mA/VDC, thermocouples, or RTDs.
- Digital Inputs (UPR900): Four digital (logic) inputs (C1 to C4) are standard. They operate from a DC voltage signal or switch closure ("volt free" contacts). Open contacts (>5000 ohm) or 2 to 24VDC signal equate to Logic High. Closed contacts (<50 ohm) or -0.6 to +0.8VDC signal equate to Logic Low. Five rear terminals are used (25 to 28 for C1 to C4 +ve input, with 33 as a shared common -ve). These inputs are "Edge Sensitive," requiring a high-to-low or low-to-high logic state transition to change function status, and the current state is remembered at power down.
- Digital Inputs (ATC990): As UPR900, with additional functions for control.
- Control (ATC990): Single loop PI/PID control.
- Outputs: Relays can be used as alarm outputs. Boolean logical outputs (1 OR 2, or 1, 2 OR 3) are also available. Each output can be selected to latch or not independently.
- Calibration Resistor Value: Default 80% of sensor maximum for semi-automatic strain gauge calibration.
- Pressure Tune Output Pulse (ATC990): Configurable from -25% to +25%, default 10%.
- Automatic Stand-by Parameters (ATC990):
- Pressure Stand-by Threshold: 0 to 15% of full scale or OFF.
- Pressure Stand-by Recovery Time: 1 to 60 seconds.
- Pressure Stand-by Active Limit: Active power limitation value.
Usage Features
- Strain Gauge Input Settings: Users can configure input type (Strain Gauge is default), engineering units (KGcm, Mpa, psi, bar, or none), number of decimal places (max 5 digits), scale range upper and lower limits, filter time for signal noise, and input failure mode (High or Low).
- Peak Detection: Can be set to Maximum, Minimum, or Disabled (default). An extra Operator Mode screen displays the highest or lowest input value since the last reset. Reset is performed by pressing UP & DOWN simultaneously or via a digital input.
- Semi-Automatic Strain Gauge Calibration: If enabled, uses a resistor within the transducer to calibrate the instrument. The procedure involves setting the Shunt Resistor to Enabled, defining the Calibration Resistor value (e.g., 80% of sensor maximum), and performing low and high point calibrations by applying zero pressure and then the required %mV value. Error messages like "Count Failure" or "R Cal Failure" indicate issues with the transducer or signal.
- Manual Strain Gauge Calibration: If the shunt resistor is disabled, users must manually input known Zero Offset and Full Scale mV values using an accurate mV calibration source. The process involves setting the Shunt Resistor to Disabled, and then performing low and high point calibrations by applying the transducer mV signal at zero pressure and at full scale.
- Linear and Temperature Calibration & Scaling:
- Single Point Calibration: Applies a 'zero offset' across the entire span to correct constant errors or for critical single values.
- Two Point Calibration: Corrects both "zero" and "span" errors by applying separate offsets at two points in the range.
- Multi-point Scaling: For linear input signals (mA, mV, or VDC), allows linearization of non-linear signals using up to 15 breakpoints.
- Alarms (UPR900): Up to 3 alarms selectable as Process High, Process Low, Rate of Signal Change, or Sensor/input Break. The alarm source can be input 1 or 2. Users set the threshold, hysteresis, and alarm filter time. An option to inhibit (mask) an alarm at power-up is available. Colour change on alarm is optional.
- Alarms (ATC990): Additional alarm types include PV-SP Deviation, Band, Control Loop, Percentage memory used, High and Low power.
- Digital Input Functions (UPR900): Each digital input (C1-C4) can be configured for functions like IP1/IP2 Peak Reset, Alarm Reset, IP1/IP2 Zero Calibration, and Data Recorder start/pause.
- Digital Input Functions (ATC990): Additional digital input functions include Setpoint Selection, Auto/Manual Ctrl Select, PID Control Outputs enable/disable, Run Pre Tune, Run Self Tune, and Increment/Decrement Control Output.
- Automatic Stand-by (ATC990): Prevents overshoots after temporary process interruptions (e.g., pressure drops to zero) by preventing integral component saturation. It activates when the unfiltered controller input leaves a defined band around the setpoint. If the input recovers within the "Pressure stand-by recovery time," the controller returns to normal. If not, it switches to manual mode at 0% power. The "Pressure Stand-by Active Limit" further limits output swing by confining power to a range around the stored steady state value.
Maintenance Features
- Calibration Reminder: If the Data Recorder option is fitted (indicating a battery-backed Real Time Clock), a calibration reminder can be set. If enabled and the set date is exceeded, a "calibration due" screen will be shown every 24 hours and at every power-up until the date is changed or disabled.
- Alarm Status Screen: From the normal main operator screen, pressing the BACK key shows the Alarm Status Screen.
- Clear Latched Outputs Screen: Another press of the BACK key from the Alarm Status Screen shows the Clear Latched Outputs screen (if any are latched). Latched outputs can be unlatched using the UP or DOWN key, provided the associated alarm is no longer active.
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