Laboratory ventilation - dual motor fans
Laboratory ventilation - dual motor fans
(OP)
Hi all,
Does anyone know where I can find information, GA drawings etc for a dual motor (duty/standby) centrifugal fan (SWSI & DWDI)with a nexen disc brake system. The consultant has specified this arrangement however fan suppliers in Australia do not appear to have experience with the arrangement. The intent of the arrangement is that should a belt/motor/bearing fail then the duty motor will be de-energised and the standby motor will start. The consultant says that failure can be sensed by the variable speed drive for the duty motor and initiate an auto changeover to the standby motor. The brake system will initiate on standby motor failure and a backup fan (same arrangement) will take over.
Does anyone know where I can find information, GA drawings etc for a dual motor (duty/standby) centrifugal fan (SWSI & DWDI)with a nexen disc brake system. The consultant has specified this arrangement however fan suppliers in Australia do not appear to have experience with the arrangement. The intent of the arrangement is that should a belt/motor/bearing fail then the duty motor will be de-energised and the standby motor will start. The consultant says that failure can be sensed by the variable speed drive for the duty motor and initiate an auto changeover to the standby motor. The brake system will initiate on standby motor failure and a backup fan (same arrangement) will take over.





RE: Laboratory ventilation - dual motor fans
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RE: Laboratory ventilation - dual motor fans
I have seen AHU fans with dual motors with belt drives.THe idle motor also will be in rotation and I remember an electrical engineer mentioning about an anti EMF protection in the idle motor circuit to prevent the buildup of back EMF
RE: Laboratory ventilation - dual motor fans
Belt failure detection is available within a VSD. I'm product manager for the Siemens range of HVAC drives (http:/
RE: Laboratory ventilation - dual motor fans