57
6 Commissioning
NOTICE
It is possible to achieve optimisation by manipulating P-factor (parameter 899) and dead time
(parameters 898 and 900), that inter alia also depends on the installation's properties; e.g. one
may set a somewhat shorter dead time if the P-factor is reduced at the same time.
Recommendation:
Set a slightly longer regulation cycle and smaller P-factor higher safety!
6.6.5.8 Setting a Base Value for "Deactivated controller” and "Air shortage”
Parameters 901 and 902
Parameters 917 and 918
During fault, O
2
trim would deactivate these and depending on the cause, the specified cor-
rection value for "deactivated O
2
controller” or "air shortage” would be displayed as an output.
The burner would not shut down.
Parameter 897 can be set by the customer to specify a burner shut-down if the fault is "air
shortage”.
6.6.5.9 Base Value For Inactive O2 Trim/Insufficient Air
The base values for deactivated O
2
trim and air shortage can be called up by parameter 896.
8 Correction input base value for ’deactivated O
2
trim’ parameter 901/902
9 Correction input base value for air shortage parameter 917/918
Recommended settings:
for parameters 901/902 and 917/918
Base value for deactivated O
2
trim < neutral value
Base value for air shortage < base value for deactivated O
2
trim.
NOTICE
The neutral value is obtained from the chosen correction mode:
Correction mode + 50%/-50% neutral value 500 50%
Correction mode+ 60%/-40% neutral value 600 60%
See chapter 6.7.5 Correction Modes
Factory settings:
Parameters 901/902 base value for ’deactivated O
2
trim’ 300
Parameters 917/918 base value for ’air shortage’ 150
This results in the following overall picture (approximate):
To Next Page
Loading...
Need help?
General
