Safety Phase (Phase 01) - Siemens LMV37.4 Series Basic Documentation

Building Technologies Division
Industry Sector
7.5.2.4.

Safety phase (phase 01)

The safety phase is an intermediate phase which is completed prior to triggering
lockout. The relays of the fuel valves and the safety relay (fan) are deenergized, but
lockout does not yet take place. The alarm relay is not yet activated. If possible or
permitted, safety checks or repetition counter checks are made whose results decide on
the transition to Lockout phase or Standby. The duration of the safety phase is dynamic
(depending on the extent of testing), the maximum time being 30 seconds.
This process is aimed primarily at avoiding unwanted lockouts, e.g. resulting from EMC
problems.
Basic documentation LMV37.4...
7 Basic unit
55/235
CC1P7546en
20.09.2013