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Siemens Commissioning Guide CM1G5192en
Building Technologies 1 0BSafety and CE compliance 29.07.2010
1.1 Operation in the event of fire or emergency situations (ESM)
The user of the SED2 variable speed drive must be aware that fire / emergency operation may only be activated
should crucial events occur (e.g. fire), where continued operation of the motor (fan) is mandatory to ensure smoke
and heat extraction, for instance, in order to facilitate the evacuation of people.
When triggering fire / emergency operation, certain alarm and fault status messages of the SED2 (e.g.
overtemperature of SED2, breakdown of bus communication) will be suppressed. In the case of other faults (e.g.
overvoltage or overcurrent), restarts will permanently be triggered. Suppression of the protective functions shall
ensure that – during fire / emergency operation – the motor continues to run as long as possible.
When using this operating mode, damage to the SED2 itself cannot be excluded, be it due to failure of internal
components or fire caused by excessive heat. In addition, it must be taken into account that – due to the
parameterized behavior of the SED2 – other HVAC plant components can also be damaged during fire /
emergency operation. This includes air dampers, for example, which can be damaged as a result of overpressure
(e.g. when the maximum motor speed is parameterized). Such damage can lead to HVAC plant malfunction or
failure – a fact to be considered when triggering fire / emergency operation.
For these reasons, Siemens Building Technologies assumes no responsibility for any faults, malfunctions and
damage of the SED2 itself or of any other types of components used in the relevant HVAC plant, or for direct or
indirect damage resulting from activation of fire / emergency operation.
The correct functioning of fire / emergency operation depends on the right selection of the HVAC system
components of which the SED2 constitutes only one component. Plant used in vital sectors, such as ventilation
plant that need to mandatorily and constantly deliver a certain amount of outside air, must be approved by the
respective authorities.
Fire / emergency operation can be triggered via one of the 6 digital inputs DI1...6. The display shows alternately
“ES“ and the motor’s frequency.
Fire / emergency operation can be deactivated any time via the digital input that was used for activation. Then, the
SED2 will resume normal operation as parameterized.
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