Siemens AVS75.39 Series User Manual page 169

Input EX 1
Function input EX1
Siemens
Building Technologies
This operating line defines the function of input Ex1 (230 V).
Line no. Operating line
5980 Function input EX1
None ¦ Counter 1st burner stage ¦ Heat gen lock ¦ Error/alarm message ¦
Excess heat discharge
5981 Cont type input EX1
NC ¦ NO
5986 SLT error message input L1
Off ¦ Always ¦ Automatically
None
Activation of input Ex has no impact.
Counter 1st burner stage
Input EX1 acquires the signals for counter values (operating hours and starts) for
the 1st burner stage.
If the function is not activated, the counting values are counted based on the state
of relay.
Heat generation lock
The source is locked by closing contact EX1.
All temperature requests made by the heating circuits and by DHW are ignored.
Frost protection for the boiler will be maintained.
The chimney sweep function can be activated although the heat generation lock is
switched on.
Error / alarm message
A controller-internal error message is triggers when contact EX1 is closed.
If the "Alarm output" (relay outputs QX2-5, operating lines 5890 – 5895) is
appropriately configured, the error message will be forwarded or displayed by an
additional contact (e.g. external lamp or horn).
Excess heat discharge
Excess heat draw is triggered by closing the contact.
Active dissipation of excessive heat enables an external heat source to force
consumers (heating circuit, DHW storage tank) to draw excessive heat by
delivering a forced signal.
The parameter "Excessive heat draw" can be used to determine for every
consumer whether or not it should take account of the "forced" signal, and hence
whether or not that consumer should participate in the dissipation of heat.
Local effect
When using LPB device address 0 or >1, excessive heat dissipation only acts on
the local consumers connected to the controller.
Central effect (LPB)
When using LPB device address = 1, excessive heat dissipation also acts on the
consumers connected to the other controllers in the same segment.
The distribution of excessive heat from segment 0 across other segments of the
system is not possible.
User manual RVS43.345
The settings in detail
169 / 239
CE1U2354en_021
2013-09-02