Signal Priority; Plant Behavior - Siemens Synco 700 Series Basic Documentation

Acknowledgement
(standard fault)
Example
Acknowledgement and
reset (extended fault)
Example
Priority urgent
Priority nonurgent
Examples
Building Technologies
HVAC Products
These types of fault require an acknowledgement.
If a plant uses more than 1 time switch master in the same geographical zone, this fault
status message must be acknowledged.
There is an acknowledgement and a reset required for this type of fault.
If both pumps of the twin pump signal a fault, the fault status message must be ac-
knowledged and – after correction of the fault – be reset by pressing the fault button a
second time.

13.5.2 Signal priority

Fault status messages are called urgent when correct operation of plant can no longer
be ensured.
For example, "Boiler sensor error" would be an urgent fault status message.
Nonurgent fault status messages
• do not adversely affect the plant operation directly
• allow plant to operate with restrictions
A nonurgent fault status message would be "Outside temp sensor error", for example.

13.5.3 Plant behavior

There are:
• Faults with plant stop or aggregate stop
• Faults without plant stop or aggregate stop
Whether a fault leads to an aggregate stop (e.g. shutting boiler down and deactivating
pumps) or a plant stop (shutting all boilers down) depends on the type of fault.
Faults of a boiler or faults of a boiler pump also lead to shutdown of the relevant boiler.
A fault of the boiler sequence manager can cause the entire multiboiler plant to shut
down.
The universal fault inputs only lead to a plant stop if "Stop" is parameterized.
Number Text
5201 Hol/spec day program
failure
5102 >1 time switch in plant 1
10 Outside temp sensor
error
2491 [Main pump B] overload
2492 Main pump] fault
Boiler sequence controller RMK770
13 Function block "Faults"
Effect
Nonurgent message; must not be acknowl-
edged
Nonurgent message; must be acknowl-
edged
Nonurgent message; must not be acknowl-
edged
Contact overload B active.
Nonurgent message; must be acknowl-
edged
Main pump has failed.
Urgent message; must be acknowledged
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CE1P3132en
23.04.2009