19
CYCLE TIME
676 to 8=676 seconds
This cycle time functions like the O1 Output
Cycle Time but allows independent cycle time for cooling. A
setting of zero will keep output O2 off.
RELATIVE GAIN
676 to 0676
This defines the gain of the cooling relative to
the heating. It is generally set to balance the effects of cooling to
that of heating. This is illustrated in the Heat/Cool Relative Gain
Figures. A value of 0.0 places the cooling output into On/Off
Control.
6
-F.8
DEADBAND/OVERLAP
.555 to 5555
This defines the overlap area in which both heating and
cooling are active (negative value) or the deadband area
between the bands (positive value). If a heat/cool overlap is
specified, the percent output power is the sum of the heat power
(O1) and the cool power (O2). If Relative Gain is zero, the
cooling output operates in the On/Off Control Mode, with the
On/Off Control Hysteresis
4*?) in Output Module 8."& becoming
the cooling output hysteresis. The function of Deadband is
illustrated in the Control Mode Explanations. For most
applications, set this parameter to 0.0 prior to starting Auto-Tune.
After the completion of Auto-Tune, this parameter may be
changed.
STEP 7.5 MODULE 5 - Cooling (Secondary) Parameters (=."8)
PARAMETER MENU
To enable Cooling in Heat/Cool applications, the Alarm 2 Action must first be set for Cooling. (For P16
Controllers, the cooling output is sometimes referred to as secondary output.) When set to cooling, the output no
longer operates as an alarm but operates as a cooling output. The O2 terminals are the same as A2, however
a separate O2 annunciator indicates Cooling Operation. Cooling output power ranges from -100% (full cooling)
to 0% (no cooling, unless a heat/cool overlap is used). The Power Limits in Output Module
8."& also limit the
cooling power. In applications requiring only a Cooling output, the main 01 output should be used.
876
4?48
076
G:(8
HEAT/COOL RELATIVE GAIN FIGURES
Heat/Cool Deadband = 0
Heat/Cool Deadband < 0
Heat/Cool Deadband > 0
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