4
SCL2:lower limit for analogue input 2 (same as SCL but for input 2 - factory setting 0);
SCH2:upper limit for analogue input 2 (same as SCH but for input 2 - factory setting 100);
SPL: lower setpoint limit (same as SCL but for setpoint - factory setting 0);
SPH: upper setpoint limit (same as SCH but for setpoint - factory setting 100);
Example: for SIEMENS pressure sensor QBE2.. P25 (25bar), the input signal used is 0-10V: if you want to work between 5 and
19 bar, set SPL to 500 and SPH to 1900 (kPa). That way the setpoint scale can be set between 500 and 1900 kPa (5 and 19
bar).
OFF1:correction for analogue input 1 (factory setting 0)
OFF2:correction for analogue input 2 (factory setting 0)
OFF3:correction for analogue input 3 (factory setting 0)
HYST:"K6" auxiliary contact differential (factory setting 1)
dF1: delay applied to sensor signal to prevent transients (range 0-100sec.; factory setting 1 sec.)
6. Manual control
z To control burner output manually, press the EXIT key for 5 sec. with the burner operating - the LED with the hand symbol
lights.
z At this point, use the up arrow and down arrow to increase or decrease burner output.
z To exit manual mode, press the EXIT key.
z NB: Every time the controller switches the burner off (start enabled LED off - Q13-Q14 contact open), manual mode is disa-
bled when the burner is switched back on.
7. Instrument self-setting (auto-tuning)
z If the burner in the steady state does not respond properly to heat generator requests, you can activate the instrument's
self-setting function, which recalculates PID values for its operation, deciding which are most suitable for the specific kind of
request
z To activate this function, proceed as follows:
z Press the PGM key and down arrow at the same time.
z The green display reads tunE and the instrument forces the burner to increase and decrease output.
z During these output oscillations, the instrument calculates the PID parameters (proportional band, integral time, derivative
time).
z At the end of calculations, the tunE function switches off automatically and the instrument has stored the new parameters.
z If you want to disable the self-setting function, press the up arrow once it has started.
z PID parameters calculated by the instrument can be edited at any time following the procedure illustrated earlier in point 2.
Note:
If no key is pressed for ~10sec. during the instrument's setting, the instrument automatically exits setting mode and
returns to normal operating mode.
To Next Page
Loading...
