107 of 124  Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 8: Electrical Works  8.23.2 Tag numbering  8.23.3 Emergency control  8.23.4 Group control  8.23.5 Motor routine 1  8_Vol3_d4.3_Section 8 electrical works_en_GIR.rev8.doc  A global function shall prevent more objects to start at the same time. The fault inputs will make the object go into fault. The actual fault will be indicated on the  CMSsystem until the object is reset or as long as the fault is active.  The object supervises that a running signal is coming within a specific time after a start command has  been given. If the running signal is not present before the time has elapsed the object will go into fault  and the supervision fault will be indicated. The function works both ways  i.e. if the running signal is  present when the start command is zero.  It handles the following input signals or communication:  The object can be in 3 different modes:  The object is a standard motor routine handling motors with one direction. The group start object is a standard routine handling start/stop of a group of objects. (Ex. a pumping  station includes all pumps  level meters  and automatic control)  If appropriate  an emergency control for a function should be developed.  The contractor must analyse any risk and effects of any failures of the system. The automation shall  react in an appropriate way of any failure such as:  Individual signals and components are identified by means of tag numbers. Tag numbers must be unique and matching main station software as well as in electrical installations  and documentation.   Missing/bad signal from a transmitter   Failure in a component   Auto   Manual (from local panel)   Operator (from operator station)   Auto   Thermal Faults   Moisture faults (if available)   Safety switch   Emergency stop   Actual current (motors with frequency and soft starter)   It handles the following output:   Start contactor 