HPCL , Viskah Refinery has 6.8 MW ,6.6 KV , VFD of Nidec ,Italy make for RG Compressor of DHT unit .There are frequent failure of VFD control card (FLTCTL card ). Request to give feedback on failure of control cards if any with mitigation taken . Also we have provision for on line changeover from VFD to DOL and vice versa. Recently we had one failure during changeover from DOL to VFD mode. Pls. provide feedback on performance of changeover scheme .
V.A. Katne, CGM (Maint.), HPCL-Mumbai(Expert) - 06-Oct,2020 13:55
Following measures may help : a) Ensure control cards are stored properly. b) Ensure EMC while handling c) Ensure voltage is maintained within the band. d) Ensure panel temperatures / humidity when AC fails.
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