Super Systems 9120 with TS - Manual (Page 47)

SSi 9120 Touchscreen Interface
4586 – 9120 With Touch Screen Interface Page 47 of 80
The minimum measured millivolt tolerance of the probe required to start a burnoff. Clicking on
the value will allow the user to change the value.
Burnoff Maximum Temperature
The maximum measured temperature allowed during a burnoff. If the temperature value is
exceeded
the burnoff will stop . This is done to help maintain the life and the accuracy of your
probe. Clicking on the value will allow the user to change the value.
PID Loop Setup
PID is the tuning parameters
entered for each Process
Variable loop.
Prop Band (0 for On/Off)
This is the proportional band
field. P = Proportional (Prop
Band). This is a field in which
you want to stay around the
setpoint.
The range 0 – 999.0
Reset
This is the reset field. I =
Integral (Reset). This is the
actual temperature being
monitored over a period of time and then averaged to keep within the Proportional band. The
reset is in repeats per minute. This affects the output of the controller. It will be proportional to
the amount of time the error is present. This helps to eliminate offset.
The range 0 – 100.00
Rate
This is the rate field. D = Derivative (Rate). This is the sudden change or rate in the
temperature. This rate is in minutes. This affects the controller output which is proportional to the
rate of change of the measurement and will control the amount of output by time restraints. Thus
derivative takes action to inhibit more rapid changes of the measurement than proportional
action. Derivative is often used to avoid overshoot.
The range is 0 – 100.00. The rate is not typically used for heating/carbon
Mode
This is the mode of the loop.
The values are: Dual Reverse, Single Reverse, Dual Direct, or Single Direct.
Dual – This has two output relays which can increase and decrease to achieve your SP.
Single – This has one relay which works in only one direction to achieve your SP.
Direct - If the PV - SP equals a positive number and the output would bring the PV down toward
setpoint that is direct.
Reverse – If the PV - SP equals a negative number and the output would bring the PV up toward
setpoint then that is reverse