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7
Tips and Tricks
7.9
Enter Set Point Values
Selector switch (2) to "Setting”
Run to desired setpoint from above
if accidentally running below this point
Run above setpoint and re-approach from above
7.10
Entering the Highest Setpoint
Selector switch (2) to "Setting”
Run to desired setpoint from below
If accidentally running below this point
Run below setpoint and re-approach from below
NOTICE
Only in this way will you reach the same valve position and hence also the same combustion
values in setting as later during automatic operation.
7.11
Start Without Pre-Purge
Even if the installation is to be started without pre-purge, the pre-purge signal (terminal 3) must
be given for at least 3 seconds so that the VMS progresses one sequence and approaches
the ignition point. Pre-purge need only be continued to the end, i.e., with the channels running
to their end position, if the pre-purge signal is present for more than 10 seconds. If the pre-
purge signal is removed before all actuators are up, this is ignored and the actuators still move
to the topmost limit stop.
7.12
Ignition Delay During Adjustment
When the ignition point is entered for the first time, it is possible to observe the ignition process
by entering a delay time.
To do this, the time needed to run to the burner sight glass and to the boiler end respectively
must be set in parameter 759. As soon as the question ’Really ignite?’ is confirmed by press-
ing the ENTER key, the time expires.
After this sequence, the ignition is released.
This time operates only if the VMS is on SETTING mode.
7.13
Set Firing Rate Automatically
Parameter 4 is used not only to select the separate ignition point but also to determine whether
the regular firing rate input is to be automatically pre-set during setting.
If this is the case, the firing rate points (in addition to the ignition point) are fixed at the values
200 (corresponding to 4 mA at the firing-rate input), 250, 300, 400, 500, 600, 700, 800, 900
and 999.
It is then possible to switch only between these points by using the FIRING RATE switch po-
sition. You cannot run to intermediate values during SETTING.
Storing a point causes the firing-rate default to skip to the next value (unless this is already
taken up). In this way a curve can be entered without shifting to FIRING RATE.
Summary of Contents for VMS 4
Page 2: ......
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...
Page 145: ...144 10 Appendix...
