Super Systems 9205 Series - Manual (Page 33)

Series 9205 Operations Manual Rev A 32
Then the value for the Positive Output Accumulator after five seconds will be (100.0 + 99.0 + 99.0 + 98.0 +
97.0) or 493.0.
To reset the Positive Output Accumulator, simply click Edit while the Positive Output Accumulator is
highlighted and confirm the reset. This will cause the Positive Output Accumulator to be reset to zero and
start accumulating values again from that point.
Negative Output Accumulator
The Negative Output Accumulator is the sum of the negative outputs (given in percentages up to one
decimal place) measured each second. The sum of the negative values is expressed as a positive value. This
means that, if an output of -50% is recorded after one second, a value of 50 will be added to the Negative
Output Accumulator. Similarly, if the following outputs are recorded over five seconds:
Output (in %) Seconds Passed
-20.0 1
-20.0 2
-21.0 3
-21.0 4
-22.0 5
Then the value for the Negative Output Accumulator after five seconds will be (20.0 + 20.0 + 21.0 + 21.0 +
22.0) or 104.
To reset the Negative Output Accumulator, simply click Edit while the Negative Output Accumulator is
highlighted and confirm the reset. This will cause the Negative Output Accumulator to be reset to zero and
start accumulating values again from that point.
Overshoot Control Logic
Overshoot control logic is activated when a large setpoint change occurs. If the logic is active and a large
setpoint occurs, it sets a working setpoint at an appropriate distance from the desired setpoint to prevent
the PV from overshooting the desired final setpoint. When the PV reaches or crosses this working setpoint,
then the logic exponentially ramps the working setpoint to the desired final setpoint.
Ramp Detect Logic
The Ramp Detect logic works in conjunction with the instrument recipe programmer. If the control loop is
the temperature loop for the recipe programmer, and the OPCODE is a ramp, then the control loop does
some special checks. If the Overshoot Control Logic is active, then the final setpoint of the ramp is used to
determine the working setpoint band. However, the ramp setpoint is used until the band is reached. Also,
once the band is reached, if the ramp is faster than the overshoot logic exponential ramp, then the program
is temporarily put on hold as needed to sync the two ramps.
Ramp Level 1 Control and Ramp Level 2 Control
Ramp Level 1 and 2 Control are only active if the Ramp Detect logic is active.
Ramp Level 1 Control provides mild overshoot protection during a recipe ramp.
Ramp Level 2 Control is only active if the Ramp Level 1 control is active.
Ramp Level 2 Control provides enhanced overshoot protection during a recipe ramp.