32 of 124  Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 08: Electrical Works  Soft starter Overload Protection shall be built-in and protect the Thyristors (SCRs) from exceeding the  maximum load capacity. (8) Fault Detection (9) Inputs (10)  Outputs (11)  Analog Input and Output  (12)  Operator Interface HMI  8_Vol3_d4 3_Section 8 electrical works_en_GIR rev6.doc  The starter shall be operated with a LCD display presenting all data and information using a language neutral  icons and figures. All numbers shall be presented using four positions, seven segments. The soft starter shall be equipped with a minimum of one (1) analog output and one (1) analog input signal  using 4 – 20mA. It shall be pre-programmed so 20mA is representing 1,2 times the set Ie value.  In order to protect both starting equipment and the load, the soft starter shall be provided with the fault  detections below. All fault detections and signals shall be standard and not possible to disable or disconnect.  When a fault occurs it shall be indicated directly on the soft starter what type of fault it is. At least the following  fault indications shall be available.  Soft starter Over Temperature Fault  shall be built-in and protect the Thyristors (SCRs) from excessive heat  in the enclosure or heat sink. The temperature shall be measured direct on the Soft starters heatsink with an  internal temperature sensor.  Phase-Loss  detection shall be standard and it shall shut down the soft starter if there is no current detected in  any of the three phases. Shunt Fault  shall detect if there is a current flow through when stopped, from having a shorted thyristors  (SCR) or a by-pass contact(s) closed. Bad network quality  detection shall be standard and indicate if the main supply network contains of excessive  disturbances.  Current lost detection  shall detect and stop the soft starter if the operational current is lost in one or several of  the three phases.  Low control supply voltage  shall stop the soft starter in case of interruption of the control supply to secure a  safe stop of the soft starter.  High Current Protection:  The soft starter shall be equipped with a fixed high current protection, tripping if the  current reaches above 8 times the set rated current and when lasting longer than 200ms. Communication fault. In the event of a communications failure the soft starter shall give indication of the  failure and revert to the off position, only active when serial communication is used. The  soft  starter  shall  be  equipped  with  three  digital  inputs,  Start,  Stop  and  Reset.  Inputs shall are provided for the control and operation of the soft starter and they shall have a common 24VDC  internal source for the control. The digital inputs for start and stop shall be self holding circuits, allow controlling of the soft starter without the  need of an external relay.  The soft starter unit shall have a minimum of three (3) signal relays. The function of the relays shall be, Run (NO – normally open), T.O.R indicating feeding the motor with 100& voltage (NO – normally open)  Event (No and NC – normally open and normally closed) 