Introduction; Description - Presys DCY-2057 Technical Manual

PRESYS
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Instruments

1 - Introduction

1.1 - Description

The PRESYS DCY-2057 Controller is a microprocessor-based instrument
which control and show any process variable found in industrial plants, such as:
pressure, temperature, flow, level etc. It is provided with two types of non-volatile
internal memories (E2PROM and NVRAM) to store configuration and calibration
values. Its high accuracy is warranted by auto-calibration techniques based on high
thermal stability voltage reference.
It can communicate with computers by optional communication module
RS-232 or RS-422/485.
The DCY-2057 Controller was designed according to modularity and flexibility
concepts. Therefore, five plug-in points are provided inside the Controller for the
installation of optional modules. By acquiring just these optional modules, the user is
capable of transforming a Single-Loop Controller, into a Dual-Loop Controller, of
obtaining a wide variety of control output types, such as: by relay, by open collector
voltage, by solid-state relay, voltage (1 - 5V, 0 - 10V), current (4 - 20mA). It can even
be provided with three alarm module types, such as: by relay, by open collector
voltage and by solid-state relay.
It is provided with several control modes: ON-OFF, PID (with all its
combinations), time proportioning, programmable setpoint, cascade and remote
setpoint input.
The DCY-2057 Controller is provided with auto-tune algorithm to compute the
PID parameters for optimizing control capabilities.
It incorporates all standard control characteristics, such as: auto-manual
bumpless transfer, output saturation, remote setpoint and programmable setpoint up
to ten segments, protection against integral saturation, etc.
It is capable of monitoring two inputs. Input 1 is a pressure input, and input 2
can be configured as another pressure input or as an universal standard analogical
input.
Thus, the Controller can accept one or two inputs of gage or absolute pressure
or vacuum. There are versions available for use with air and inert gases or sealed for
fluids compatible with 316L stainless steel. In the version for single pressure input,
the second input accepts the connection of 4-20mA, 1-5VDC,
thermocouple and RTD.
The thermocouple and RTD inputs are automatically linearized by means of
tables stored in the EPROM memory. A 24VDC voltage source, isolated and with
short circuit protection, is provided for transmitter power supply.
Except for pressure input, the input type for channel 2 can be selected by the
user and enabled by jumpers and software configuration. All configuration data can
be protected by a password system, and are stored in the non-volatile memory in the
event of a power failure.
DCY - 2057 Pressure Controller
0-10VDC,
Introduction
Page 1