EbV
Product documentation THETA NORM/UNIT
8-5
Time delay stage II
(..22..)
The enabling of stage II (full load stage) is determined not only by the switching
differentials, but also by a time delay. This measure blocks the second stage within
the set time and hence provides for a longer stage I run time. This function is active
only during the start-up phase (i.e. during simultaneous request of both stages). If
stage I is in basic load mode and stage II is in the control phase (residual heat
coverage), the latter is switched on immediately for each request.
Note:
This setting is overlapped by the cascade setting during cascade mode and is not
available.
Enabling mode
Stage II
(..22..)
The effect of a set stage II time delay can
be modified during
the start-up phase
below
the heat generator minimum temperature limit with the parameter "Enabling
Mode stage II":
Unlimited enabling during start-up release
During the start-up phase both stages operate without limitations.
Time out during start-up release
Stage II is switched on according to the set time delay.
Note:
This setting is overlapped by the cascade setting during cascade mode and is not
available.
1)
The decrease in temperature becomes slower every time stage II is switched off because
stage I acts as a backup.
2)
Switch on line of stage II is not reached, temperature is rendered by stage I.
3)
The temperature decreases below switch on line of stage II due to higher heat demand.
B
o
il
er temperat
ure
Switch-off line stage I
Switch-off line stage I
Switch-off line stage II
Swap SD
Switch-off line stage II
Switch-off line stage I
Swap SD
Switch-off line stage I
Switch-off line stage II
Setpoint
Switch-on line stage II
Switch-on line stage I
Switch-on line stage I
Switch-on line stage II
Switch-on line stage II
Switch-on line stage I
Theoretical process with stage I only
Area 1
High decrease (start up)
Heat coverage with full load
Burner stage I and II
Area 2
low decrease
Heat coverage with partial
load (only burner stage I)
Area 3
increased decrease
Heat coverage with full load
(both burner stages)
Содержание Controller Series
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