
Wa t l o w S e r i e s F 4 P
F e a t u r e s
■
7 . 5
Control Methods
Auto (closed loop) and Manual (open
loop) Control
Auto (closed loop) control uses a process sensor to deter-
mine the difference between the process value and the
set point. Then the controller applies power to a control
output load in order to reduce that difference.
Manual (open loop) control allows the user to directly set
and adjust the power level to the control output load.
The Series F4P Auto/Manual Indicator Light is on when
the controller is in manual mode. The controller can only
switch between auto and manual mode from the Main
Page. To toggle between manual and auto mode, first
press the
å
key, then confirm your selection in the lower
display. The indicator light will flash after you press the
å
key until you confirm your choice or 10 seconds have
elapsed.
In manual mode, the user manually adjusts the output
power level. Changes take effect when the new value has
been entered and the controller is back in the Main Page.
Before it switches from manual to auto mode the F4P
checks to make certain a functioning sensor is connected
to analog input 1.
The user can select how the Series F4 determines a set
point when it makes a transition from manual to auto op-
eration. It can automatically switch back to the last set
point it used in auto mode or use reverse bumpless trans-
fer, which will establish a set point that equals the pro-
cess value at the time it was switched from manual
mode.
Location in software: Setup Page > System.
The user can protect the process being controlled by se-
lecting the maximum control output power levels that
will be allowed when the controller switches from auto to
manual power.
Location in software: Setup Page > System > Maximum
Heat Transfer Power and Maximum Cool Transfer Power.
Содержание F4P Series
Страница 4: ...ii Table of Contents Watlow Series F4P Notes...
Страница 14: ...2 8 Operating from the Front Panel Watlow Series F4P Notes...
Страница 58: ...6 32 Parameters Watlow Series F4P Notes...
Страница 77: ...Watlow Series F4P Features 7 19 Notes...
Страница 78: ...7 20 Features Watlow Series F4P Notes...
Страница 94: ...8 16 Installation and Wiring Watlow Series F4P Notes...
Страница 108: ...Notes 9 14 Communications Watlow Series F4P...