Super Systems 9130 Series - Manual (Page 25)

Series 9130 Operations Manual Rev - 24
Setpoint Change Limit
This is a smart time feature that allows Process Loop to use PB only without Reset until the Process
Variable drops below the percent output set under this category.
It is used to eliminate overshoot.
The Output percentage selected under this category
must be above the normal operating output percentage
of the furnace at heat.
The options are: OFF, 80%, 70%, 60%, 50%, 40%, 30%, or 20%.
Example: If the furnace runs at 40% output at heat for the maximum load, the setpoint change limit should
be set to 60%.
Low Limit
This is the low limit for the loop. The range is –100 to 100.
High Limit
This is the high limit for the loop. The range is –100 to 100.
0 Setpoint Stops Control
If the Setpoint is zero, then all outputs are turned off. The option is either Yes or No.
IN1 high limit shuts down ctrl
If input 1’s high limit is reached, then all outputs are turned off. The value can either be Yes or No.
IN2 high limit shuts down ctrl
If input 2’s high limit is reached, then all outputs are turned off. The value can either be Yes or No.
IN3 high limit shuts down ctrl
If input 3’s high limit is reached, then all outputs are turned off. The value can either be Yes or No.
PID Auto Switch
This is the PID auto switch field. The value can either be Yes or No.
Switch Point PID 1 -> 2
This is the PID Switch Point field. This is used in conjunction with the PV Switching feature. See the
PV
Switching section for more information. The range is –300 to 4000.
Switch Point PID 2 -> 3
This is the PID Switch Point field. This is used in conjunction with the PV Switching feature. See the
PV
Switching section for more information. The range is –300 to 4000.
Overshoot Limit Gain
This is the Overshoot limit gain field. When calculating the control action, sometimes the calculation would
call for more than 100% which is not possible. The output is limited to 100% or whatever was set in the
High Limit field. The difference of the unlimited minus the limited is multiplied by the overshoot limit gain
and divided by 100. This is subtracted from the control output. If the gain is 0 there is no effect. Under
normal control the unlimited equals the limited and there is no effect. If there is a big change where the
control loop drives hard, then the effect is to limit the drive as it approaches setpoint and limit the
overshoot.
The limited is the values set in the upper and lower limits fields. The unlimited would be what is calculated
before limiting. For a big setpoint change, the calculations may compute 150% output, but the true output
is limited to the upper limit.
The range is 0 to 9999.