STORK TRONIC ST552 Glass, Руководство пользователя

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Order number: 900350.011 V2.70 Seite 15
Figure 4
Heating phase after significant cooling (refer to
Figure 3, top):
After significant cooling to temperatures below 50
°C, e.g. loading of large quantities of cold fat, a slow
heating phase will start, although the change-over to
normal heating mode is effected earlier; the heating
relay clocks like in the initial heating phase.
Thus, manual change-over to normal heating
function is only effective for the current heating
phase and will become ineffective as soon as the
setpoint is reached, at the latest. After that, as well
as after mains failure and restart, the controller is in
normal operation mode with slow heating phase
when the controller is switched on and started or
restarted later or in the case of cool-down to
temperatures below 50 °C. The switch-back
threshold is can be set via parameter "P79".
Clocking of automatic burner device in the case of heating mode "Gas+Fan"
Control to setpoint with "burner clocking"
To obtain a better control to the setpoint in the case
of heating mode "Gas+Fan", clocking of the
automatic burner device can be activated. If the
correcting variable percentage determined by the
control part is smaller than the lower speed limit of
the fan defined in parameter "P61", the fan remains
at this minimum speed and the automatic burner
device is clocked until the setpoint is reached.
In this case, the control part calculates the on
phases from 0...100 % based on the correcting
variable values, with a minimum on time / minimum
off time being enforced by parameter "P59". The
feedback is handled such that the time between the
activation of the heating output and the receipt of the
feedback signal is not considered as effective on
time. Thus, the effective on time will start only upon
receipt of the feedback signal.
Below the burner clocking range, the automatic
burner device will always be on at first. Above the
burner clocking range, i.e. after the setpoint was
reached, the automatic burner device and the fan
are switched off if the correcting variable becomes
zero. For the fan, lead and delay times as well as a
start-up boost are always effective.
If burner clocking is deactivated, the automatic
burner device will always be switched on below the
setpoint, and the control is affected by defining the
fan speed based on the correcting variable, within
the limits specified via parameters P61 and P62,
across the whole proportional range. Above the
setpoint, the automatic burner device and the fan will
be switched off.
Gentle heating with "heating clocking"
Two operation modes are available for gentle
heating of cold fat, with the effective correcting
variable always being defined via the ratio of the on
and off times in "P71" and "P72".
Heat clocking with fan:
If P56=2 the so-called heating clocking is affected
only via the fan, the burner will be on permanently.
The speed value of the on phase is defined by "P64",
in the of-period, the minimum value defined by „P61"
is valid. Note that the percentage value specified in
"P64" is relative to the area of "P61 ... P62". Further
the final value of the “on-period” is not reached in
case of very short turn-on times in "P71" because
the fan speed increase is reduced with parameter
"P63".
If P56=3, the heating clocking is affected by
switching the automatic burner device on and off at
the time values defined in “P71” and “P72”, with the
fan always maintaining its minimum speed according
to "P61". Parameter "P64" has no function in this
operation mode.
Heating phase after
with manual change-over
Setpoint