Eaton S811+N37 series User Manual

Contents

TroubleshootingS811+ Soft Starter MN03900001E—November 2012 43Note: If connected to a network, starting the S811+ fromthe Control Input terminal block may isolate problemsassociated with the network and not with the softstarter.2. It is often useful in determining the nature of the faultcondition by noting when the trip occurs duringoperation of the S811+ soft starter. The operation of theS811+ may be categorized into the following periods;● The S811+ Soft Starter trips Immediately when theSTART command is issued.● The S811+ Soft Starter trips during the START rampand never reaches bypass.● The S811+ Soft Starter trips when the bypasscontactors are closing.● The S811+ Soft Starter trips during running operationwhile bypass contactors are closed.● The S811+ Soft Starter trips after the Stop commandis received.● The S811+ Soft Starter stops sooner than expectedduring a soft stop. If the Soft Stop Time is set toolong for the motor loading (high loads), the motor willbegin to stall when delaying SCR firing reduces thevoltage. The S811+ Soft Starter will detect thisstalling due to the increase in current flow and endthe stop immediately and not indicate any faults.Refer to the flowchart on Page 44 to aid in determining theappropriate corrective action during the various run phases ofoperation.Note: If no fault codes are present during an unexpected“trip” of the soft starter, verify that the soft starter didnot receive a STOP command.Detailed information describing fault codes andcorrective action may be found in Appendix I.Troubleshooting—S811+ Stopped or FaultedCondition Possible Problem Suggested Corrective ActionStatus LED is GREEN Stop command received.Terminal block wiring not secure.Loss of 24 Vdc control power.Transient fault when Reset Mode set to AUTO.External control device failure.External mains device failure or trip condition.Control board failure.24 Vdc permissive signal lost—investigate control system.Check control wiring for security.Check 24 Vdc power source for correct sizing and circuitconnections.Change Reset Mode to Manual to capture fault condition.Inspect external control devices for proper operation.Inspect external devices for condition and proper operation.Possible device fatal error.Status LED is RED Protection/Operation parameters not set to proper values.Fault condition exists.Fault not reset from previous trip.Reset Mode set to Manual.Determine Fault condition from the Fault History.Adjust Protection parameter values to prevent recurring fault trips.Correct problems with mains voltages and/or phase conditions.Attempt to reset fault—the fault will not reset if the faultcondition exists.Set Reset Mode to Manual to retain soft starter in faultcondition for troubleshooting. Correct fault condition andchange Reset Mode to Auto if desired.Set Protection parameters to Warning.Reset Mode set to Manual and no Reset signal was sent to thesoft starter. Reset soft starter or change Reset Mode to AUTO.No status LEDs illuminated,DIM display dark.No Control Power supplyDevice failure.Provide 24 Vdc to Control power terminal block.Check Control Power for proper value and reliability.