Coffee Boiler Heating; Programming And Readings - La San Marco NEW 105 TOUCH Serie Bedienung Und Wartung

-> hIGh sensitivity
7.3 Coffee boiler heating
WITh ON/OFF ADjUSTMeNT WITh hYSTeReSIS OF 2°C
The temperature is adjusted with a hysteresis of 2°C. The heating element is controlled by the ON/OFF relay,
which is de-energised on reaching the programmed temperature T°SeT (see TeChNICAL LeVeL Program-
ming) and it re-energises when it drops by 2°C. To avoid vibrations on the trigger threshold, a time-controlled
filter is also fitted.
To activate this function, you will need to set in TeChNICAL PROGRAMMING all the pid constants to 0 (see
relevant paragraph).
WITh PID ADjUSTMeNT (DeFAULT SeTTING)
The temperature is adjusted according to a proportional, integrated and derivative algorithm.
(see TeChNICAL LeVeL Programming for parameter settings)
The heating control is enabled when the dosage function is IDLe-ON and it uses a temperature probe and a
low voltage command RISCAF for triac or solid state relay with PID function.
The temperature is adjusted according to an algorithm which uses 3 constants:
- proportional (kp)
- integrated (ki)
- derivative (kd)
the three constants must be adapted to all types of coffee doses according to the power characteris-
tics of the heating element, the size of the boiler, its dissipation, and so on.
The "setpoint value or T°SeT" is defined as the temperature the boiler needs to be at to operate normally
- If during the heating or maintenance phase the temperature oscillates excessively around the T°SeT, with
peak values which do not attenuate over time, the proportional constant needs to be lowered: Kp
- If during the maintenance phase the temperature oscillates excessively around the T°SeT, with a pro-
longed oscillation time and peak values which do not attenuate over time, the integrated constant needs
to be lowered: Ki
- If during the heating or maintenance phase the temperature oscillates excessively and is often more than
the T°SeT, but it attenuates over time, the derivative constant needs to be lowered: Kd
- If during the heating phase the temperature tends to be below the value of the T°SeT, differing from it more
and more, the derivative constant needs to be increased: Kd
- If during the heating phase the temperature tends to be below the value of the T°SeT constantly, the
proportional constant needs to be increased: Kp and the integrated constant also needs to be increased
slightly: Ki
- If during the maintenance phase the temperature tends to be below or above the value of the T°SeT con-
stantly, the integrated constant needs to be increased: Ki and the proportional constant also needs to be
increased slightly: Kp
7.4 Programming and readings
PROGRAMMING COFFee DOSeS
The quantities relating to the volumetric coffee doses can be modified and stored by following the procedure
set out below
 In IDLe-ON status, press the K5GRx (1..3) key and keep pressing it for 5 seconds; make sure that the
lighting of the LeDs l5GRx (1..3) switches from fixed to flashing.
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1MΩ for example in the event of mountain water or glass level
indicator
PID T°SET