13
General Information FMS Operating Principle
Setting the pilot burner,
servicing mode
Program monitoring time
Restarting
Leakage test (option)
4 curve sets (option)
Automatic fuel change
Flying curve change
(option)
Range limits
A so-called servicing mode can be set via parameters. The control unit then
runs until the stabilisation period. In this mode 5 successive starts are
possible without the need for pre-ventilation and without a leakage test.
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The 5 start is automatically followed by pre-ventilation and/or a leakage test.
It can be determined by way of parameters how long the FMS may take
after a start signal (terminal 2) until ignition occurs. If this length of time is
exceeded, a fault shut-off occurs. If the content of the parameter is set to
0, no fault occurs (= program monitoring time = T).
Automatic restart can be activated via parameters. The control unit attempts
a one-off restart in the event of any fault marked with * after a factory-set
period (standard: 10 sec). This restart can be prevented by setting the period
to 0.
n the case of firing systems according to EN 676 the parameter must
be set to "0”.
The standard setting is without restart.
The control unit may optionally also perform the leakage test on the gas
valves. The leakage test can per performed before ignition and/or after
shut-off
The leakage test is performed by way of the main valves. The use of filling
and discharge valves is also possible by means of relay switching.
The FMS offers the facility for using two curve sets for each fuel
(e.g. summer/winter operation) or a mode with and without speed.
When using Option 4: Curve sets, it is possible to switch within one fuel
selection from one curve-set to the other (flying curve change). Fuel
change can only be performed via "Off”.
When switching the fuel selection switch over (terminal 75), the FMS first
moves automatically to the base load position. Then the system switches
off. Only then are the fuel selection and thus the curve set changed over. If
the "Burner on” signal is still present, the burner starts with the new fuel.
(This function is not available with Option 4: Curve sets).
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In the 1 pre-ventilation after "Clear memory”, the FMS determines the
maximum range of travel for each control element and stores this
automatically. If no ranges limits have yet been determined, the setting (in
the case of constant outputs the feedback setting) in pre-ventilation
stands at 0 and 999 points respectively. At all further starts a check is
made to see that these range limits are correct. Should the limit switches
be shifted or the frequency converter setting changed after programming,
the range limits must be re-entered.
If the range limits cannot be determined automatically, they can also be
entered manually by way of parameters. If the FMS has no existing range
limits, it automatically takes the top and bottom point of the curve as the
limit. It then does not go beyond this.
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