Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 08: Electrical Works  31 of 124  Deceleration Control shall be built in and be selectable with the following adjustments, all of which shall be  completely independent of any acceleration setting.  Ramp Type for stop:  For the stop ramp, it shall be possible to select between a voltage ramp and torque  control.  Ramp Time for Stop: The deceleration time shall adjustable from 0-30 seconds to allow controlled  deceleration and soft stop of the motor.  End Voltage Level:  End voltage level shall be adjustable from 20-60% of line voltage. The end voltage shall  be set simultaneously as the initial voltage (at start).  Torque Control:  Torque control feature shall be based on closed-loop principle with self-adjusting output to  thyristors. The self-adjustment in the closed-loop shall be in relation to an actual and ideal load characteristic,  where the ideal torque is set up using the soft starter parameters. The objective of the torque control feature  shall be to obtain smoothest possible stop-ramp for pumps where output torque curve closely follows the load  curve in order to prevent pressure surges and water hammering.  (6) Motor and Load Protection  Motor and Load Protection shall be integrated with the soft starter and all the protection functions shall under  no circumstances be disconnected or disabled when the integrated by-pass contactors are used. All the different protection functions shall be selectable individually and all be switched off as default except  for the Motor Overload Protection. In order to protect both the load and motor the Soft starter shall be provided  with the following functions:  Motor Overload Protection:  This protection shall be possible to turn on and off. When active, (On) it shall be  possible to select between some predefined standard overload trip curves. The trip curves shall be selectable  between the following tripping classes - Class 10A, 10, 20 and 30. The overload protection shall be based on a  thermal register retained in memory until the motor is completely cooled down (no risk of re-starting the  motor).  Motor Underload Protection:  This protection shall be possible to turn on and off. When active (On) it shall be  possible to set between 0,2 - 1,0 times the set rated current value.  Locked Rotor Protection:  This Locked Rotor Protection shall be possible to turn on and off. When active (On)  it shall be possible to set between 0,5 – 7 times the set Ie value.  Manual or Automatic Reset:  For the three different protections above it shall in be possible to select between  manual reset and automatic reset in unattended remote applications. The factory default shall be manual reset.  Thermal Memory:  The over load protection shall not lose track on the motor temperature if the control supply  voltage is lost or shut down, or the motor is stopped. Upon reapplication of power within two hours, the  microprocessor shall be updated as to the motor temperature and adjusted for real time cooling while the power  was off. Thermal Capacity Reset Level : If the Motor Overload Protection is tripping, the softstarter shall not allow a  restart (reset) until the motor has cooled down to 60% of its total thermal capacity.  Phase Reversal:  The soft starter shall be totally insensitive for Phase Reversal and shall be able to start in all  various combination of incoming phase orders.  (7) Softstarter Protection  Soft starter protection shall be provided to maintain reliability of both the driven equipment and the electrical  components, with the following features:  8_Vol3_d4 3_Section 8 electrical works_en_GIR rev6.doc 