marke Posted August 19, 2007 Report Share Posted August 19, 2007 If the starter trips occasionally on phase loss, determine if there is a genuine phase imbalance condition occurring intermittently, and if so, try to correct the situation. If the problem can not be fixed, then you can desensitize the starter by increasing the setting in parameter 7. Maximum sensitivity is at a setting of 1 and minimum sensitivity is at a setting of 10. If the problem continues with a setting of 10, and there is no current imbalance, it is probable that there is a fault on the control pcb. The control pcbs are identical for all EMX and EMX2 models and can be swapped between units without any reprogramming. Swap the main control pcb between two starters and see if the problem moves. Best regards, Mark Empson | administratorSkype Contact = markempson | phone +64 274 363 067LMPForum | Power Factor | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | Pressure Transducers | Smart Relay | GSM Control | Mark Empson Website | AuCom | Soft Starters Link to comment Share on other sites More sharing options...
GGOSS Posted August 23, 2007 Report Share Posted August 23, 2007 The EMX and EMX2 starters are a closed loop controlled current soft starters which utilize external ring type current transformers (CT's) for the purpose of current measurement. In addition to the information presented by Marke, it is wise to confirm that there are no loose connections in the secondary CT cabling. Check the integrity of electronic components and solder joints on the PCB to which the CT terminal strip connects is also suggested. It is my humble opinion that the above-mentioned checks be performed before altering the setting of function 7 or swapping PCB's. Regards, GGOSS Link to comment Share on other sites More sharing options...
marke Posted August 23, 2007 Author Report Share Posted August 23, 2007 Good points GGOSS I always ask those questions, but forgot to add them to the list here. I rarely find any issues with the CT wireing etc except where there is an external earth attached. - DO NOT connect an external earth to the CT secondaries! Best regards, Mark Empson | administratorSkype Contact = markempson | phone +64 274 363 067LMPForum | Power Factor | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | Pressure Transducers | Smart Relay | GSM Control | Mark Empson Website | AuCom | Soft Starters Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now