Setting Failsafe Mode; Carbon Potential, Oxygen And Dewpoint Algorithms; Table 4-28 Procedure For Setting A Failsafe Mode - Honeywell UDC3500 Product Manual

Monitoring and Operating the Controller

4.24 Setting Failsafe Mode

Introduction
You can set the Failsafe Mode to be Latching or Non-Latching.
Set Failsafe Mode

Table 4-28 Procedure for Setting a Failsafe Mode

Step Operation
Select Control
1
Set-up Group
Select Failsafe
2
Function Prompt
3 Select a value
4 Return to Normal
Display

4.25 Carbon Potential, Oxygen and Dewpoint Algorithms

Introduction
Carbon probes can be used to control Carbon Potential, Percent Oxygen or Dewpoint
applications by configuring the Input Algorithm 1 for the desired type.
Most carbon probes consist of a zirconium oxide (ZrO
measure the temperature at the ZrO
for the ZrO sensor and two for the thermocouple. The ZrO
2
1 on this controller while the thermocouple is connected to Input 2. Input 1 actuation is
automatically set to Carbon when any Carbon Potential Algorithm is configured, to
Oxygen when the Oxygen Algorithm is configured, and to Carbon when the Dewpoint
Algorithm is configured. The thermocouple in these probes is normally a K, R or S
thermocouple type. However, Input 2 can be configured for any input actuation for
applications where some other temperature sensor is used. PV Source in the Control Set
Up Group should be configured to IN ALG 1.
Instruments with Two Loops may use Loop 1 to control the Carbon/Oxygen/Dewpoint of
the oven while Loop 2 may use the temperature measured by Input 2 to control the
temperature of the oven. For this application, PV Source in the Control Set Up Group
240
Press
Until you see:
Setup
Upper Display = SET
Lower Display = CONTROL
Func You will see:
Loop 1/2
Upper Display =
LATCH (Controller goes to manual and output goes to
NoLATCH (Controller mode does not change and output
Lower Display = FSMODE
To select a failsafe mode in the upper display.
or
Lower At power up, the output will go to the value set.
Display
sensor). These probes generally have four wires, two
2
UDC3500 Universal Digital Controller Product Manual
Result
failsafe value)
goes to failsafe value)
) sensor and a thermocouple (to
2
sensor is connected to Input
2
3/07