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Alarm Mode (Menu 4)
The Alarm Mode is used to select whether the Status Contact will open when the unit is
stopped remotely via the Start Contact. It can be set to:
1. Alarm When Off
The Status Contact opens when the unit is stopped (turned
off) remotely via the Start Contact.
2. No Alarm When Off
The Status Contact remains closed when the unit is stopped
(turned off) remotely via the Start Contact.
Low Temp Alarm Setpoint (Menu 1)
When enabled the Status Contact will remain open until the Process Temperature exceeds
this setpoint. See the Process Setpoints section for more detail.
AUXILIARY TEMPERATURE SETTINGS
There are two settings that affect the way that the Auxiliary Temperature signal is used by the system:
Process Control and Aux Temp Mode.
Process Control (Menu 5)
This setting is used to select the thermocouple input that is associated with the Auxiliary
Temperature signal. See the Process Control Settings section for more details.
AUX Temp Mode (Menu 5)
Aux Temp mode can be set to any of the following:
1. Disabled
The Aux Temp signal is ignored by the system.
2. Display Only
The Aux Temp signal is only used for display purposes. It can
be read on the PF2100 display in manual mode via the Review
Menu. It can also be read remotely via the Modbus Expansion
Card if it is installed and enabled.
3. Temp Main Ctl
The Aux Temp signal is used as a secondary Process Control
input. This modifies the normal Process Control by adding
the additional requirement that the signal be below the Aux
Setpoint for the main valve(s) to open.
4. Temp ESD
The Aux Temp signal is used as an auxiliary ESD input. In
addition to the normal Process Control, if the Aux Temp signal
ever rises above the Aux Setpoint, the system will shut down.
COMMISSIONING SETTINGS
The date and location of commissioning can be stored in the PF2100. This information is optional and can
be input by the customer directly. These two settings can be viewed in menu 3 and edited in menu 4.
Commission Date (Menu 4)
This is the date on which the PF2100 was commissioned. Use the Up and Down keys to edit
the date and OK to advance to the next date field.
Commission Location (Menu 4)
This is the location where the PF2100 was installed. Use the Up and Down keys to edit each
character and OK to advance to the next character.
DISPLAY SETTINGS
There are two settings that affect the behavior of the display: Display Sleep and Temperature Display
Units.
Display Sleep (Menu 4)
When enabled, the display will turn off to conserve power after 10 minutes of inactivity (no
user key presses). Otherwise, the display will always remain on.
Temperature Display Units (Menu 4)
The PF2100 always operates in Celsius. This includes storage of temperature setpoints,
thermocouple measurements, temperature calculations, and modbus communications. This
setting only affects the temperature units on the display. This may lead to small rounding
errors when operating in Fahrenheit.
PASSWORD SETTING
There are two levels of password protection. Menus 1-3 and the Quick Setpoint Adjust feature may be
optionally protected by the Level 1 Password. Menus 4-7 are always protected by the Level 2 Password.
These passwords cannot be modified.
Level 1 Password:
Level 2 Password:
For convenience, once a password has been entered it unlocks all menus that it protects for a period
of time. Therefore it does not need to be re-entered when returning to the menu later. The menus will
remain unlocked for 10 minutes or until the user manually locks the menus again. To lock the menus
manually, press and hold the OK button for 3 or more seconds. The display will briefly show “Password
Logout” to indicate that the menus are locked again.
Password Enable (Menu 4)
When enabled, the Level 1 or Level 2 Password must be entered to access menus 1-3 and
the Quick Setpoint Adjust feature.
PID CONTROLLER
A PID Controller is a type of feedback control algorithm commonly used in industrial control applications.
The purpose of the controller is to maintain a process variable as close as possible to a user defined
setpoint. This is accomplished by continuously measuring the difference between the current value of
the process variable and the desired setpoint value and then adjusting some manipulated variable to
compensate for the difference. The PID Controller gets its name from the initials of the three tuning
coefficients that are built into the control algorithm: the Proportional coefficient, the Integral coefficient,
and the Derivative coefficient. These coefficients set the Controller’s response to three types of errors:
the current error (Proportional), the sum of all past errors (Integral), and the predicted future error
(Derivative).
PF2100 PID Controller
The PID Controller is used to maintain the Process Temperature as closely as possible to
the Process Setpoint. The Controller adjusts the 4-20mA output signal which in turn drives a
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