Eaton S611 Quick Start Installation Manual

Also see for S611: Installation leaflet User manual Installation leaflet

TroubleshootingS611 Soft Starter MN03901003E—January 2012 www.eaton.com 9S611 Fault Codes, continuedNote Shorted SCRs are the most common mode of SCR failure. With power completely removed from the unit, measure the resistance of each pole, line to load.If the resistance is near zero (less than 5 ohms), it is most likely that the SCR is shorted. Resistance of a serviceable SCR is approximately 10k ohms.Resistance typically moves to a lower value as the SCR ages. This feature may be disabled (not recommended).Code Fault Condition Solution18 Shorted SCR • SCR is shorted• Internal bypass contactor welded shut• No load on the SCRs when STARTcommand is issued• Test resistance of each phase• Contact EatonCare for service19 Instantaneous Overcurrent • Excessive starting current• Excessive load• Reduce starting load• Increase soft starter capacity (be sure model ratingscan handle current demands)20 Overload • Motor overloaded for an extendedperiod of time• Thermal memory is over 100%• Reduce the motor’s load• Verify the Overld Trip FLA and/or Ovrld Trip Class forproper adjustment• Note: Exceeding nameplate ratings will shortenequipment life• Fault during motor start: Verify system is notexceeding the specified maximum starts per hour• Increase the initial torque and/or reduce ramp timeto bring the motor up to speed faster• Increase Trip Class setting (5–30 maximum) and/orreduce ramp time setting21 Mains AC Voltage Loss • Fuses or breaker open• Disconnect open• Replace fuses, close disconnect, or reset breaker22 Under Voltage • Incoming AC line voltage below tripthreshold• Incorrect mains supply voltage• Connect to correct supply voltage• Verify that mains voltage is within acceptable values• Verify Motor Rated Voltage in the Operation mode isset to the correct value23 Over Voltage • Incoming AC line voltage above tripthreshold• Incorrect mains supply voltage• Connect to correct supply voltage• Verify Motor Rated Voltage in the Operation mode isset to correct value24 Phase Reversal • Incoming line phase rotation sequenceopposite of device setting• Single-phase missing and/or open fuseor breaker• Set Phase Sequence to match incoming sequence OR• Exchange two incoming mains phases• Verify that all circuit breakers are closed or fuses areserviceable25 Start Stall • Motor not at rated RPM at end of startramp time and/or current is in excess oftrip threshold• Bypass contactors not closed at the endof the start time (start current low/ramptime short)• Lengthen Soft Start Time and/or increase InitialTorque in the Operations mode• Increase trip threshold• Loads that are heavily loaded (high inertia) during astart such as fans will often need an initial torquesetting much greater than the factory default• Set Kick Start parameters27 SCR Overcurrent • Excessive SCR current during the startramp• Only active when Stall Fault is disabled• Increase Soft Start Time and/or Initial Torqueparameters in Operation mode• Reduce starting load• Verify S611 is properly rated for current28 Under Load • Loss of motor load• Trip threshold set too high• Excessive current fluctuation duringoperation• Inspect for failed motor coupling or pump cavitation• Reduce trip threshold• Increase trip delay time to ride through transient loadchangeswww.comoso.com

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