Ii.a) Basic Concepts - Tech Controllers EU-880 zPlD User Manual

User's manual
and the same controller without PID control:

II.a) Basic concepts

Lighting - cycle that lasts until the flue gas temperature reaches a specific value, provided that it does
not drop below this value for 4 minuts (factory setting for lighting time).
Operation – after the lighting procedure is completed the controller will go into operating cycle mode
and the display will show the message: "PID:OPERATION". This is the main operating status of the
controller in which the blower function is run automatically and fuel is supplied automatically based on
the PID algorithm oscillating around the user's set-point temperature. If the temperature suddenly rises
by more than 5°C above its set-point value so-called monitoring mode is activated.
Monitoring mode - this mode will start automatically if during any time that the controller is in operating
cycle mode the temperature rises by more than 5°C above its set-point value. If this happens in order to
lower the circulating water temperature the controller will switch over from PID control to manual settings
(as per parameters set in the Installation menu>>Monitoring mode) and the display will show the
message: "PID:MONITORING".
Shutting off - if the flue gas temperature drops below a specified value and does not rise above this
value for 10 minuts (factory setting for shutting off time), the controller will go into shut off mode. In
this mode the blower and feeder will stop running and the display will show the message: "SHUT OFF".
If there is power failure the thermoregulator will stop working.
When power is restored the controller will resume operation at its pre-set parameters restored from its
built-in memory. No saved thermoregulator parameters are lost when there is power failure.
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