Specifications

Synergy Nano Technical Manual, Revision -
Page 48
Tuning versus Control System Issues
Control system non-linearities, refrigeration and other issues can disrupt chamber performance and can
appear to be PID tuning problems.
The following chart shows the log file of a control system issue that wasn’t caused by PID tuning. In this
case, the boost cooling system was turning on during the linear portion of a cooling ramp and causing major
perturbations in the control system as a result of the changing system gain.
The following chart shows the log file of this issue. In this plot, the actual (Act) temperature in yellow shows
significant fluctuations
On the other hand, the heating control loop is unstable in the following chart. This was correcting by
increasing the Heat Proportional band for 7 to 14.
Smooth
Response
Abrupt
Response
Smooth
Response
Abrupt
Response
Oscillating
Heat