Super Systems 9205 Series - Manual (Page 32)

Series 9205 Operations Manual Rev A 31
Setpoint Upper Limit
This is the upper limit for the setpoint. The range is –300 to 9999.
Cascade SP Lower Limit
This is the cascade setpoint low limit. The 9205 uses the difference between the cascade SP lower limit and
the cascade SP upper limit and multiplies that value by the % output of the load loop. It then offsets this
value by the cascade SP lower limit and feeds the furnace loop this value as a setpoint.
Cascade SP Upper Limit
This is the cascade setpoint upper limit. The 9205 uses the difference between the cascade SP lower limit
and the cascade SP upper limit and multiplies that value by the % output of the load loop. It then offsets
this value by the cascade SP lower limit and feeds the furnace loop this value as a setpoint.
Example:
Cascade SP Lower Limit: 0
Cascade SP Upper Limit: 2000
The load has a setpoint of 1700 and it is at 37 % output. The furnace setpoint will be calculated as follows:
(2000 – 0) * 0.37 + 0 = 740.
PV Source
The options for PV Source are either Internal or External. If External is selected, the loop’s PV must be
written by an external source (an example would be a 7EK controller, PLC, etc.). Selecting Internal will
continue normal operation where the source is determined by the PID loop and the PV type.
Minimum Forward On Time (sec)
This setting specifies the minimum number of seconds for which output must be positive (heating) before
the control is turned off. The maximum value for this setting is 100.
Minimum Forward Off Time (sec)
This setting specifies the minimum number of seconds for which the control must be off after heat is
applied. The maximum value for this setting is 100.
Minimum Reverse On Time (sec)
This setting specifies the minimum number of seconds for which output must be negative (cooling) before
the control is turned off. The maximum value for this setting is 100.
Minimum Reverse Off Time (sec)
This setting specifies the minimum number of seconds for which the control must be off after cooling is
applied. The maximum value for this setting is 100.
Positive Output Accumulator
The Positive Output Accumulator is the sum of the positive outputs (given in percentages up to one decimal
place) measured each second. Therefore, if the following outputs are recorded over five seconds:
Output (in %) Second Passed
100.0 1
99.0 2
99.0 3
98.0 4
97.0 5