DCP200 Profile Controller & Recorder - Product Manual

CPU

This stands for Central Processing Unit and refers to the onboard microprocessor that controls the measurement, control, alarm and display functions of the instrument.

Current Proportioning Control

Current proportioning control is used to produce the correcting variable on units with linear output(s). It provides 4 to 20mA, 0-20mA, 0 to 5V, 0 to 10V or 2 - 10V DC for proportional control, PI, PD or PID control modes. On-Off control cannot be used with linear outputs.

Also refer to: Correcting Variable, Linear Output, On-Off Control, PD, PI, PID, Proportional Control, and Time Proportional Control.

Custom Display Mode

The user can copy up to 50 Configuration Menu parameters into Operation Mode using the PC software. It the Custom Display in enabled in the Display Configuration sub-menu, these screens follow the normal Operation Mode screens. In this mode these screens are not pass- code protected.

Also refer to: Control Configuration, Display Configuration and Operation Mode

Cycle Time

For time proportioning outputs, the cycle time is used to define the time over which the controller averages the ON vs. OFF time, in order to provide the required correcting variable. Each Time-Proportioning output has its own adjustable cycle time. Shorter cycle times give better control, but at the expense of reduce life when used with electromechanical control devices (e.g. relays or solenoid valves). There are separate cycle times for the Primary and

Secondary control outputs

 

Settings = 0.5 to 512 seconds

Default value = 32 secs.

Also refer to: Correcting Variable, PID, Primary Proportional Band, Proportional Control, Relay, Secondary Proportional Band, Solenoid Valve and Time Proportioning.

Data Recorder

The Data Recorder option can record the process value, setpoint, alarms and events over time. Recordings can be transferred to a USB memory stick or via the serial communications options. This option includes a USB Interface and a battery backed-up Real Time Clock.

Refer to the Data Recorder Option section of this manual for more details.

Also refer to: Recorder Configuration.

Deadband

-Refer to Overlap/Deadband.

Derivative Action

The Derivative Time Constant defines how the control action responds to the rate of change in the process variable. The power is decreased if the PV is rising, or increased if the PV is falling. This parameter is not available if primary control output is set to On-Off, and it is normally set to OFF in modulating value applications as it can cause premature wear due to constant small adjustments to the valve position.

Settings = OFF or 0 seconds to 99 minutes 59 seconds

Default value = 01.15.

Also refer to: Modulating Valve, On-Off Control, PD Control, PI Control, PID, Process Variable, Tuning and Valve Motor Drive Control.

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Glossary

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Honeywell DCP200 manual Current Proportioning Control, Custom Display Mode, Cycle Time, Data Recorder, Deadband

DCP200 specifications

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