Watlow F4P Series, User Manual, Page: 70 / 124

7 . 1 2
■
F e a t u r e s Wa t l o w S e r i e s F 4 P
Advanced Features
Boost Heat and Boost Cool
Boost operation is supported on output 1B. Boost is en-
abled when outputs 1A and 1B are configured to perform
the same function: heat/heat or cool/cool.
The type of boost operation chosen in the output 1B
menu can be either boost on power or boost on set point.
When boost on power is selected, output 1B is turned on
or off based on the output load power requirements.
Boost on power can be enabled for operation in the auto
mode only or in both the auto and manual mode. If cho-
sen, the power level at which output 1B will be turned on
is set in the Operations Page > Control Set Points. A de-
lay time can also be set. The delay time will delay the
turn on of the boost output until the power level is
exceeded for the time of the delay. There is a 5% power
level hysteresis between boost on and boost off operation.
When boost on set point is selected, output 1B is turned
on or off based on a programmable set point value or on a
deviation from the set point value. Boost set points and
boost deviation values are set in the Operations Page >
Control Set Points.
Figure 7.12a — Boost Heat Based on Output Power.
Figure 7.12b — Boost Heat Based on a Fixed Set Point.
Boost Heat
Process Set Point
Off
On
Time
Temperature
Boost Set Point
Boost Heat
Boost Percent Power
85%
Boost On Delay
30 Seconds
Off
On
100%
85%
0%
Time
Heat % Power
5% Hysteresis