Honeywell UDC3500 - Dewpoint

Monitoring and Operating the Controller
3/07 UDC3500 Universal Digital Controller Product Manual 243
Dewpoint
The Dewpoint Algorithm is used for controlling the Dewpoint in endothermic
atmospheres. Furnace Control’s Accucarb ZrO
2
sensor is used on Input 1. Input 1
actuation is automatically set to Carbon when the Dew Point Algorithm is configured.
Input 2 may be any input actuation, but it is normally a type K, R or S thermocouple
input.
The percent Hydrogen (H
2
) atmospheric content is entered as a fixed value.
All calculations are performed by the Controller with the Dewpoint temperature shown as
the PV display. The actual reading of each analog input is available for viewing on the
lower display.
The availability of Dewpoint on Input Algorithm 2 provides the capability of controlling
Carbon Potential on Loop 1 while also being able to calculate the Dewpoint value from
the same probe. For this configuration, “DEW XX.X” may be viewed on the lower
display, where “XX.X” is the Dewpoint temperature.
4.26 Healthwatch
Introduction
The Healthwatch feature puts diagnostic data at your fingertips so you can monitor vital
performance status to improve your process, predict failures, and minimize downtime.
Valuable data regarding maintenance and diagnostic selections can be read by operator-
accessed displays. Alarms can be configured to activate when the desired threshold is
reached.
See Section 4.18 Maintenance for details on using the various Healthwatch timers and
counters. See Section 4.15 Alarms for details on Healthwatch maintenance alarms.
4.27 Setpoint Rate/Ramp/Program Overview
Introduction
The Setpoint Ramp configuration group lets you enable and configure any of the
following:
• SP RATE – a specific rate of change for any local setpoint change. (Subsection 4.28)
• SP RAMP – a single setpoint ram
p that occurs between the current local setpoint and
a final local setpoint over a time interval of 1 to 255 minutes. (Subsection 4.29)
• SP PROG – a ramp/soak profile in a 20-segment program. (Subsection 4.30)
This section explains the operation of each selection and configuration reference where
necessary.