mea03wjb Posted October 5, 2009 Report Share Posted October 5, 2009 Hi, I have just installed a VSD and gone through the set-up wizard to configure the drive. Everything went well I got the drive to rotate the motor at low speed to find the direction of rotation. It was going the wrong way so I needed to turn off the drive and re-wire the motor. The problem was that when I turned the drive off (by isolating it at the wall outlet) the RCCB at the wall outlet tripped? Then when I reset the trip and try to turn the drive back on it trips when I try to turn it back on? I kept trying and eventually I managed to get it to turn on without tripping but when I turned it off again it tripped again. Does anyone have any idea what is going on here? I have little expereince with VSDs so I have no idea what is going on. NOTE: it is telling me that there is an encoder error - this is beacuase I haven't fitted the encoder yet, just wanted to check the rotation direction - but this surely shouldn't affect turning on and off. Thanks, Wilf Link to comment Share on other sites More sharing options...
yuri Posted October 5, 2009 Report Share Posted October 5, 2009 Pins in the plug come in and out of contact at slightly different times (let's say 1 milisec.) I am in doubt whether VSDs are used with RCCBs - a B type circuit breaker is only needed: throw away the RCCB (in any case it will become a nuisance with the VSD now installed). Link to comment Share on other sites More sharing options...
AB2005 Posted October 6, 2009 Report Share Posted October 6, 2009 Yes! I also agree with yuri. VSD don't need any RCCB. We always connect an MCB (Miniature Circuit Breaker) or MCCB (Molded Case Circuit Breaker) "Don't assume any thing, always check/ask and clear yourself". Link to comment Share on other sites More sharing options...
mea03wjb Posted October 6, 2009 Author Report Share Posted October 6, 2009 Okay, I hope that is the problem. But whay don't you need an RCCB? I thought the other breakers (e.g. MCB) that you mentioned protect against overload only - what is protecting the system from residual current problems? Thanks. Link to comment Share on other sites More sharing options...
marke Posted October 6, 2009 Report Share Posted October 6, 2009 Hello mea03wjb You can get special RCCB for use with VFDs. These have a slower response time and will allow you to connect and disconnect your VFD without tripping. Best regards, Mark. 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...
mea03wjb Posted October 6, 2009 Author Report Share Posted October 6, 2009 Is this the A type RCCB or the 'SI' type? Link to comment Share on other sites More sharing options...
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