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PRESYS
| Instruments
1.0 - Introduction
1.1 - Description
The PRESYS DCY-2050 and 2051 Controllers are microprocessor-based
instruments which control and show any process variable found in industrial plants, such
as: temperature, pressure, flow, level etc. The difference between models DCY-2050
and 2051 lies just in the form which process variables are shown. In model DCY-2051
the process variable is shown on a display by four larger size digits. They are 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.
They can communicate with computers by optional communication module RS-
232 or RS-422/485.
The DCY-2050 and 2051 Controllers have been designed according to modularity
and flexibility concepts. Therefore, five plug-in points are provided inside the controllers
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.
They are provided with several control modes: ON-OFF, PID (with all its
combinations), time proportioning, heating-cooling, programmable set-point, cascade
and remote set-point input.
The DCY-2050 and 2051 Controllers are provided with auto-tune algorithm to
compute the PID parameters for optimizing control capabilities.
They incorporate all standard control characteristics, such as: auto manual
bumpless transfer, output saturation, remote set-point and programmable set-point up to
ten segments, protection against integral saturation, etc.
They are capable of monitoring two universal standard inputs, accepting a direct
thermocouple connection, RTDs, current (mAdc) and voltage (mVdc, Vdc). 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.
The type of input selected by the user is enabled by jumpers and by the 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.
They allow a power supply from 90 to 240Vac.
DCY-2050 and DCY-2051
Introduction
Page 1
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