Lamtec ETAMATIC - Manual Calculating and Setting of the Control Parameters; Guidelines

48
6 O
2
Trim
6.9.6.2 Manual Calculating and Setting of the Control Parameters
Set firing rate controller to "Manual” and run to low firing-rate.
Enter password (see chapter ExternalLink: Passworteingabe)
Key 7  more O
2
Key 6  less O
2
You should choose the setting of parameters 898 and 899 in that way, that the next setpoint
value/actual value comparison (control pulse) only takes place if the actual O
2
value has
changed visibly (~ 60% of end value). A mark at the centre of the setpoint display indicates
that a setpoint / actual value comparison has just been performed.
No change, or change too small  Increase P term, parameter 899.
6.9.6.3 Guidelines
Enter the calculated value in parameter 898.
Factory setting: 15 seconds.
The dead time is weighted as a function of firing rate.
The dead time reduces at high fire due to the higher gas velocities. The factory setting is A
reduction of 3 seconds in dead time.
Procedure for calculating the dead time at high fire, as described above.
Set the P-term in that way, that a deviation of 1…2 vol.% O
2
between target and actual value
is corrected within 4…6 steps without overshooting.
Repeat until the setpoint is reached within ca. 4…6 steps. Check control unit setting at medi-
um and high fire.
NOTICE
You may use the P-term (parameter 899) and the dead time (parameters 898 and 900) to
achieve optimisation which inter alia depends on the installation's properties; e.g. a shorter
dead time can be set if the P-term is reduced at the same time.
Recommendation:
Set control unit speed a bit slower and P-term smaller  safer!!!
– Set base value for "Deactivated control” and "Air deficiency”
press keys 13 and 14 to select "Set O
2
"
press key 8 to confirm the query
press key 16 until the display shows "setpoint"
press key 5 up, to activate the O
2
trim during adjustment. the display shows "T"
use the keys 6 and 7 to change the O
2
setpoint from the preset value with the range
+3 to -1 vol.% O
2
. Observe the change in the actual O
2
value simultaneously on the
display.
Control pulses too short → increase P-term, parameter 899
Overshooting → reduce P-term