Installation manual

Series C Controller Configuration and Operation Manual
8-6  Athena Controls, Inc. 900M050U00
8.3.3 Specifying the Derivative (Rate) Action for Manual Tuning of PID
Control
Parameter Name
: Derivative (30)
Name as Displayed:
dErdEr
Used By:
all controllers
When Displayed:
if output 1 or output 2 type is PID
Range:
0.0 to 0.9, 1 to 2400 seconds (See Notes 1 and 2 below.)
Default:
0.0
Description:
Used to specify the time period used by the derivative
component of the control algorithm when analyzing load
changes.
Note 1: The range is reduced when a linear input is used and the value of the dSPLdSPL
(display) menu dEC.PdEC.P (decimal position) parameter is not 0 (zero). See 4.3.2 for more
information about the effect of a linear input on numerical ranges.
Note 2: This parameter is a special case. Even if the value of the dSPLdSPL (display) menu
dEC.PdEC.P (decimal position) parameter is 2 or 3 (which is permitted when a linear input is
used), the maximum number of decimal places applied to the PID derivative (rate) action
is 1 (the tenths position).
8.3.4 Specifying the Offset (Manual Reset) for Manual Tuning of PID
Control
Parameter Name:
Offset (Manual Reset) (34)
Name as Displayed
:
OFFSOFFS
Used By:
all controllers
When Displayed:
if output 1 or output 2 type is PID
Range:
–100 to 100 percent (See Note 1 below.)
Default:
0
Description:
Used to specify a fixed amount that the proportional band will be
offset up (positive) or down (negative). The result is an increase
or decrease of power applied at the setpoint to compensate for
proportional control offset error.
Note 1: The range is reduced when a linear input is used and the value of the dSPLdSPL
(display) menu dEC.PdEC.P (decimal position) parameter is not 0 (zero). See 4.3.2 for more
information about the effect of a linear input on numerical ranges.