Appendix C
Contents
1. 2 Comms Failure Check that the unit has its original front cover and keypad No 6 Subject No Current Display If the motor current drops below 12 5 le while running in Phase Loss only or Start amp Bypass then no value is displayed No 7 Subject Cancelled 1 If trying to change from Keypad to Remote Starting with a start signal present the display flashes cancelled No 8 Subject Commissioning 2 If the Soft Start trips on overload during the start check that the starter is large enough for the load No 9 Subject Too Hot Check ventilation into the cabinet If the unit has worked for a long time check fans and airflow through unit Category Wiring Subject When Replacing Star Delta Wye Delta Starters If you are planning to re use the existing overload and contactor ensure that they are sized for the full motor line current not just for delta phase current No 2 Subject Running Inside the Delta 1 The unit must be set to Firing Mode 1 The current displayed is now the phase current 58 of the line current No 3 Subject Running Inside the Delta 2 When running with Firing Mode 1 the maximum cable length between starter and motor is reduced to 50M No 4 Subject Running Inside the Delta 3 An in line contactor must be used when running in the Delta 1st Ed RevA 09 2011 SR44 Series Soft Starter User M anual C 3 Appendix C Technical Hints i C 4 SR2. 44 Series Soft Starter User M anual 1st Ed RevA 09 2011
3. TECHNICAL HINTS Contents of this Appendix Technical HINES ia ar toi 0 8 oe aes once Sh ane oh ob oh oh Spe detec de eh ER G8 C 2 Category General 0 ccc eee eee e ee ennnes C 2 Category Troubleshooting 2 v 00 eduwsGw ceewen eaetie ads aaa es C 3 Category WINN se sctita 5 oa Sh 4544508 8d Eee Ss oes Lawes sed C 3 Appendix C Technical Hints rrr Technical Hints Category General Subject Motor Configuration If the motor starts O K but stalls as soon as a load is applied then check the configuration of the motor i e it may be that the motor is meant to be connected in delta but is actually connected in star wye No 2 Subject Kick Start Kick start is not always suitable for use with rolling starts or very light loads No 3 Subject Slip Ring Motors 1 When sizing a single stage of resistors for use with a Soft Starter care must be taken to balance the standstill torque requirements against large slips at full voltage No 4 Subject Slip Ring Motors 2 Slip rings may be shorted at partial voltage by forcing a user current limit at start and then using the current limit timeout flag to control K2 and hence the shorting contactor No 5 Subject Commissioning 1 Itis a good idea to start by using one of the standard applications Refer to Applications Menu Settings in Ch 5 No 6 Subject Sizing Starters Starters may need to be de rated for high start frequenc
4. y current ambient temperature altitude or long starts No 7 Subject Contactors Contactors marked for example K1 on wiring diagrams are not included within the Soft Starters No 8 Subject Soft Starts Soft Starters reduce motor starting current at the expense of reducing starting torque and increasing start time No 9 Subject Start Time with Auto Ramp When Auto Ramp is selected the ramp time is an arbitrary number with 1 being fastest up to 255 the slowest The unit will be accelerated to full speed by the microprocessor with a varying ramp profile while trying to keep the start current to a minimum C 2 SR44 Series Soft Starter User M anual 1st Ed RevA 09 2011 Appendix C Technical Hints Caa Technical Hints continued Category Troubleshooting Subject Reset Trip Trips can be reset by pressing the key on the keypad or by changing the Start Stop I p to Start if control is set to remote No 2 Subject Load 1 The Soft Starter will trip 8 if a start is attempted with no motor connected on the output No 3 Subject Intermittent 7 Sensing Signal Trip Normally caused by a noisy site First try increasing the optimize rate secondly increase trip sensitivity No 4 Subject Stopped Cooling This message is displayed during the cooling time pnu116 and is the period allowed for the unit to cool before a restart No 5 Subject Keypad Displays
Download Pdf Manuals
Related Search