![]() Cascade master outputs should track slave SPs if the slave is not in cascade (auto output and remote SP). ![]() ![]() Setpoints (SPs) should track process variables (PVs) when not in auto. The fuel/air ratio (FAR) for jackshaft burners is set by mechanically adjusting set-screws on the fuel valve-the CCS sends a single output to the actuator to drive both fuel and air together.īumpless transfer with setpoint and output trackingĪ boiler CCS’s proportional-integral-derivative (PID) loops and auto/manual bias (A/M/bias) stations should generally be configured to track as much as possible. This post also does not apply to jackshaft burners, which have a single actuator driving both the combustion air damper and the fuel valve. This post does not cover the BMS it focuses primarily on the fuel and air aspects of the CCS (rather than water and other auxiliary components). The CCS determines how much fuel, air, and water to put into the boiler, and should prevent unsafe conditions from happening in the first place. The BMS determines if there will be a fire or not, and is primarily responsible for shutting down the system if conditions become unsafe, as well as enforcing purge requirements on restart. Larger burners are controlled with a combination of a CCS and a burner management system (BMS).
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