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
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):
Summary of Contents for VMS Series
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Page 119: ...118 10 Appendix...
Page 129: ...128 10 Appendix Fig 10 9 Ger t 4 Ger t 5 with output regulator...
Page 141: ...140 10 Appendix 10 14 Declaration of Conformity...
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Page 143: ...142 10 Appendix 10 15 Protocol Example...
Page 144: ...143 10 Appendix 10 16 O2 Setpoint Curves...
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