Honeywell UDC3300, Product Manual

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4/00 UDC 3300 Controller Product Manual 157
What happens when
you change modes Table 5-8 explains what happens to the controller when you switch from
one mode to another.
Table 5-8 Changing Operating Modes
Mode Change Description
Manual to Automatic
Local Setpoint The Local Setpoint is usually the value previously stored as
the Local Setpoint.
PV tracking is a configurable feature which modifies this.
For this configuration, when a loop is in manual mode, the
local setpoint value tracks the process variable value
continuously.
Manual or Auto Local to
Automatic Remote SP The Remote Setpoint uses the stored ratio and bias to
calculate the control setpoint.
Auto bias is a configurable feature which modifies this.
When it is selected the transfer from automatic local to
automatic remote or from manual remote to automatic
remote adjusts the bias based on the local setpoint such
that Bias = LSP – (RSP Input x R).
Automatic Remote
Setpoint to Manual or
Auto Local Setpoint If configured for Local Setpoint Tracking, when the
controller transfers out of remote setpoint the last value of
the control setpoint is inserted into the local setpoint.
If LSP tracking is not configured, the local setpoint will not
be altered when the transfer is made.