70
6
Commissioning
6.8.4
Checking O
2
Influence
NOTICE
If the system is not equipped with an additional O
2
- or CO-monitor, it has to be ensured that
the combustion boundary values are kept at maximum adjacent correctional influence.
The correction value can be altered as follows in order to set the correction range and to check
the combustion boundary values.
The correction value can now be changed with channel key 1 (6), with burner on. The manu-
ally selected correction value is maintained until the selector switch (2) is turned to some other
position, or normal correction is activated by pressing channel key 2 (4) downward. Adjust-
ment of the correction range is possible by parameter 517 (with the burner in operation). In the
event of several fuels (curve sets), the range can also be adjusted individually for each curve
set and channel by parameters 517 to 596 (expert level).
To ensure that with deactivated O
2
trim, the tolerance to the air deficiency side is not growing,
the parameters 917, 918 and 901, 902 have to be set to the corresponding value. This value
depends on the selected correctional mode. Empirical formula (+ correctional mode x 10.)-
100.
Example 1:
Correction mode +60/-40
→
the parameters have to be smaller than 500, i. e. every value be-
tween 0 and 500 creates excess air (600 would correspond to the setpoint curve)
Example 2:
Correction mode +70/-30
→
the parameters have to be smaller than 600.
Burner on, controller is enabled (terminal 4).
Turn selector switch (2) to O
2
TRIM
Explanatory text is displayed
Press channel key 4 (5) downward
Explanatory text disappears
Turn selector switch (1) to FIRING RATE RATING (firing
rate)
Press ENTER (3)
Correction range is displayed.
With channel key 2 (4) upwards the manual correction
is switched on, shown by the display ’TK’ in the middle
of the display.
Summary of Contents for VMS 4
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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...
Page 142: ...141 10 Appendix...
Page 143: ...142 10 Appendix 10 15 Protocol Example...
Page 144: ...143 10 Appendix 10 16 O2 Setpoint Curves...
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