The 561108C DPS-Digital Positioner System is available as a factory pre-installed option for Valworx 5616 series electric actuators. Installing the DPS kit will change a standard On-Off type actuator to modulating or proportional control. The DPS system provides an accurate valve positioning function whereby the movement of the actuator is controlled by a 4-20mA input signal. Any change in the control input signal results in a corresponding and proportional change in the position of the actuator output (valve). An internal microprocessor on the DPS circuit board continuously monitors digitally the analog input and output signals and compares them to the physical position via an output feedback system, moving the actuator as required to balance the signals and find the desired position.
The actuator output can be positioned anywhere between 0 and 90 degrees. When used with an electric actuated ball valve or butterfly valve, the ball or disc can be positioned anywhere between closed and the fully open position or 0-100% flow (non-linear). Accuracy of the actuator with digital positioner is 2-3% full scale. The overall accuracy of a valve assembly will vary depending on the type of valve selected and how the valve is mounted to the actuator.
The positioner has auto-calibration for zero and span settings. An output monitoring signal, in the same format as the input, is also provided to confirm the output drive position. The standard DPS actuator will fail closed with loss of the control signal. The actuator can also be setup reverse acting (4mA = open) and fail open with loss of the control signal. The actuator will fail in place with loss of external power.
Standard Features:Digital microprocessor control board Auto-calibration Output monitoring signal Digital design virtually eliminates hunting Economically priced
The actuator output can be positioned anywhere between 0 and 90 degrees. When used with an electric actuated ball valve or butterfly valve, the ball or disc can be positioned anywhere between closed and the fully open position or 0-100% flow (non-linear). Accuracy of the actuator with digital positioner is 2-3% full scale. The overall accuracy of a valve assembly will vary depending on the type of valve selected and how the valve is mounted to the actuator.
The positioner has auto-calibration for zero and span settings. An output monitoring signal, in the same format as the input, is also provided to confirm the output drive position. The standard DPS actuator will fail closed with loss of the control signal. The actuator can also be setup reverse acting (4mA = open) and fail open with loss of the control signal. The actuator will fail in place with loss of external power.
Standard Features:
| Type | Digital positioner for 5616C series electric actuators |
|---|---|
| Rotation | 0-90 degrees |
| Input Signal | 4-20mA |
| Output Monitoring Signal | 4-20mA |
| Calibration | Auto-calibration zero and span |
| Accuracy | 3% full scale |
| Linearity | 2% full scale |
| Hysteresis | 3% full scale |
| Steps 4/20mA | Min. 150 per 90 degrees |
| Steps 0- 10V | Min. 98 per 90 degrees |
| Fail Condition | Standard positioner fails closed with loss of control signal. Field selectable reverse-acting mode (4mA=open) fails open with loss of control signal. Actuator fails in place with loss of external power. |
| Impedance | 100 Ohms |
