Honeywell UDC2800 Product Manual page 203

Chapter 5 - Monitoring and Operating the Controller
Table 5-16: Auto/Manual Station Mode Configuration Procedure
Step Operation
1 Select
Algorithms
set up group
2 Select Control
Algorithm
3 Select
PD+Manual
Reset function
203
Input 1 is typically the PV of some upper controller and Input 2 is
typically that controller's output. If the upper control fails, the upper
device or some watchdog opens the digital input switch and
UDC2800 back-up PID A control is active.
When the upper control reactivates, the digital input switch is closed
and the Auto/Manual Station becomes a repeater station and allows
the upper control output signal to pass through.
Configuration
There are some things to consider when configuring the controller.
The PV range stays as the Input 1 range, even while Input 2 is the PV
when the switch is closed; therefore:
The Input 2 High Value must be less than or equal to the Input 1
n
High Value.
(Suggest: Input 2 High Value = 100.0)
The Input 2 Low Value must be greater than or equal to the Input
n
1 Low Value.
(Suggest: Input 2 Low Value = 0.0)
The Tuning Gain 2 must be equal to (Input 1 High Value - Input 1
n
Low Value) / (Input 2 High Value - Input 2 Low Value).
See the following table for the configuration procedure.
Press
Setup key
Function key
Increment key
or Decrement
key
Function key
Result
Until you see
Algorithms
Enter in the first function prompt of the
Algorithms set up group: Control Algorithm.
Press the Function key again to enter in the
first configuration prompt of Control
Algorithm.
Until you see the selection
Select the selection
set up group.
PD+Manual Reset
.
PD+Manual Reset
.