Specification Sheet

51-52-03-36
Page 2
Digital Inputs
Two isolated digital inputs are provided
for remote dry contact closure to select
one of the following actions :
• Manual control mode.
• Local setpoint 1 or Local setpoint 2.
• Direct controller action.
• Hold SP Ramp/Program.
• Select PID set 2.
• Run - SP Ramp/Program.
• External program reset.
• Disable PID integral action.
• Manual mode, failsafe output.
• Disable keyboard.
• Start Timer.
• Initiate Tuning.
• Initiate PV Hot Start
• Output tracks Input 2.
• To Remote Setpoint.
• To Latching Manual Mode.
Also, the digital inputs can allow one of
the following selections to be combined
with one of the above selections:
• Select PID set 2.
• Direct controller action.
• Local setpoint 2 or Local setpoint 1.
• To Run.
• The 2nd Current Output and the 2nd
Digital Input are mutually exclusive.
Selection is made via a keyboard
entry.
Outputs and Control
Five Outputs - The following output
types are available:
• Current Outputs (4-20 or 0-20 ma)
• Electromechanical Relays (5 amps)
• Solid State Relays (1 amp)
• Dual Electromechanical Relays (2
amps)
• Open Collector Outputs
Output Algorithms - The UDC2500 is
available with one or more of the
following output algorithms:
• Time Proportional provides On-Off
or Time Proportional (Relay) output.
• Current Proportional supplies
proportional direct current output for
final control elements, which require
a 4-20mA signal. Output can be
easily configured via the keyboard
for 0-20mA operation without
recalibration.
• Current Proportional Duplex is
Similar to current proportional but
provides a second set of tuning
parameters and a split range current
output or a second current output
via the Auxiliary output option, for
the heat and cool zones.
• Time Proportional Duplex -
Depending on which control
algorithm you select, this duplex
output algorithm can provide On-Off
Duplex, Time Proportional Duplex,
or Three Position Step Control. The
time proportional duplex output
provides independent PID tuning
constants and two time proportional
outputs; one for heat zone above
50% output, and one for cool zone
below 50% output.
• Current/Relay Duplex (Relay=Heat)
- A variation of Duplex with Current
active for 0 to 50% output (PID Set
2) and Relay 2 active 50 to 100%
output (PID Set 1). Note that only
one alarm is available.
• Relay/Current Duplex (Relay=Cool)
- A variation of Duplex with Current
active for 50 to 100% output and
Relay 2 is active for 0 to 50%
output. Not that only one alarm is
available.
Heat/Cool Capability - Provides split
range control with independent PID
tuning constants—one for heating, one
for cooling—plus mixed output forms.
Universal Outputs - UDC2500 provides
“out of the box” operations, with no need
to open the case. There are no jumpers
to connect, no switches to set, and no
hardware configuration required.
Control Algorithms - Depending on the
output algorithms specified, the
controller can be configured for the
following control algorithms:
• On-Off
• PID-A
• PID-B
• PD with Manual Reset
• Three Position Step Control : The
TPSC algorithm allows the control of
a valve (or other actuator), with an
electric motor driven by two
controller output relays; one to move
the motor upscale, the other
downscale without a feedback
slidewire linked to the motor shaft.
• 3 control modes:Manual, Automatic
with Local Setpoint, Automatic with
Remote Setpoint
• Bumpless, balanceless transfer
between control modes. Available
with a Dual Display option and SP
Programming option.
Alarms
One or two electromechanical alarm
relays are available to activate external
equipment when preset alarm setpoints
are reached. Each of the two alarms can
be set to monitor two independent
setpoints. Each alarm setpoint can be
either high or low alarm. The alarm type
can be selected to be either of the
inputs, the Process Variable, Deviation,
Output, Shed from communications, PV
rate of change, or to alarm on manual
mode or a Current Output Open failure.
It can also be used as an On or Off
event at the beginning or end of a
Ramp/Soak segment. The alarm
hysteresis is configurable from 0 to
100% of range.
• Alarms can be configured as
latching or non-latching.
• Alarm blocking is also available
which allows start-up without alarm
energized until after it first reaches
the operating region.
• PV rate of change alarm.
• Loop break alarm.
• Timer output reset.
Communication
A communications link is provided
between the UDC2500 and a host
computer or PLC via the RS422/485
Modbus® RTU or Ethernet TCP/IP
communications option. An infrared
communication link is also available
allowing a non-intrusive configuration of
the instrument.
Miscellaneous
Auxiliary Output - This isolated
Auxiliary Output can be scaled from 4-20
ma for 0 to 100% for any range. It can be
configured to represent Input 1, Input 2,
PV, active Setpoint, Local SP1,
Deviation, or the Control Output.
Transmitter Power - This output
provides up to 30 volts dc to power a 2-
wire transmitter (it requires the use of
alarm 2 open collector output selection
or auxiliary output).
Dual Setpoints - A simple push-button
selection allows to quickly switchover
from primary to alternate setpoint with
minimal operator confusion.
Universal Switching Power - Operates
on any line voltage from 90 to 264 Vac
50/60 Hz without jumpers. 24 Vac/dc
instrument power is available as an
option.
Timer - This standard feature provides a
configurable time period of 0 to 99 hours,
59 minutes or units of minutes and
seconds. It can be started via the
keyboard, alarm 2, or by a digital input.
The timer output is Alarm 1 which
energizes at the end of the Timer Period.
Alarm 1 can be automatically reset. The
Timer Period can be changed between
each batch. Status is shown on the lower
display.