51
6 Commissioning
6.6.4 Operating Control and Displays
6.6.4.1 Mode Switching
Turn selector switch (1) to STATUS.
Channel key 3 in upward position the display shows O
2
trim.
Turn selector switch to STATUS position the display shows O
2
actual value and O
2
target
value. If O
2
trim is deactivated, the figures are
shown in parentheses.
NOTICE
O
2
actual and target values are only displayed if O
2
trim or O
2
display are activated by param-
eter 896.
In AUTOMATIC operation, the display switches during regular operation to the O
2
trim mode.
During burner start-up and with the basic firing rate, VMS text mode is active - basic setting
However, switching the display by means of channel key 3 is always possible. Nevertheless,
the manually preselected setting only remains in force until the next change-over into ’Regular
operation’ or ’Basic firing rate control’, and then returns automatically to the basic setting.
In ’O
2
trim’ mode, and with the selector switch in the STATUS position, pressing the ENTER
key calls up commentary texts (running texts) relating to O
2
trim.
The selector switch position (2) O
2
trim serves only for the input of O
2
target value curves.
Fig. 6-3 O
2
trim activated Fig. 6-4 O
2
trim deactivated
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