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two motors one inverter

Created by: mef3000 at: 7/11/2010 11:12 AM (17 Replies)

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7/11/2010 1:20 PM	Rate (0)
RBM Bronze Member Joined: 8/21/2008 Last visit: 7/25/2025 Posts: 141 Rating: (6)	IBN-Service Sorry, RBM, but I can absolutely NOT agree with you. If the motors do not have an additional cooling and do run with low speed at high load, it is a *must* to have some thermic protection! If the motor is running with 100% current, but with low RPM, the the internal cooling fan can not cool down the motor in a sufficent way! If there is no additional cooling, a protection is necessarily! HiIBN-Service, I think he was mentioning about the overload that need to be placed after contactor. I think the role of overload will be done by the VFD itself. But for overheating issues, the thermistor connection from motor to VFD is to be done to be on safer side. Icompletelyagree withIBN-Service. rgds, RBM

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7/11/2010 2:06 PM	Rate (0)
Vithani Platinum Expert Joined: 7/8/2009 Last visit: 6/7/2025 Posts: 1977 Rating: (479)	mef3000 hi all; i know the conditions to run several motors with one inverter.but i wana use two motors with one inverter a bit diffrent.in pic it s showed.i wana drive motors in a order like i ll run first motor then after certains hours i ll stop driver seperate first motor with contactors then connect second motor with contactors and will run second motor.motors are same.since i ll use one motor so i think i dont need a bigger inverter. but should i use v/f operating mode or SVC .or what else i should care in such operation. Hello mef3000, As you are going to run one motor at a time on VFD, and your both motors are identical and selection of motor completrly hardwire, all I have to say is you can use SVC or V/f or whatever your application want. Your case is not actualy case of multimotor so everything like control mode and protection and all other things will be same like for single motor. No need of dataset change over or no need for seperate overload protection. Now as discussed by IBN-Service, you can provide thermistor protection for safer side. Just make sure your contactor must have cross interlocks and main thing, dont operate contactor while drive is runnning, because it may damage your motor or drive. Always operate output contactor when VFD is off (Pulse Disabled) Regards, Devesh Vithani
	Last edited by: Vithani at: 7/11/2010 2:10 PM I dont Like people driving Fast, thats the reason I overtake them ;)
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7/11/2010 2:28 PM	Rate (0)
mef3000 Posts: 81 Rating: (1)	i ll stop motor and then change contactors but driver ll be on anyway .or should i turn off driver too before changing contactors?
mef3000 Posts: 81 Rating: (1)
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7/11/2010 2:31 PM	Rate (0)
Vithani Platinum Expert Joined: 7/8/2009 Last visit: 6/7/2025 Posts: 1977 Rating: (479)	No... You can keep Power On.. Only care should be taken that drive pulses should be disabled (means either OFF1 or OFF2).. Best Regards, Devesh Vithani
	I dont Like people driving Fast, thats the reason I overtake them ;)
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7/11/2010 2:55 PM	Rate (0)
mef3000 Posts: 81 Rating: (1)	so normal stop with ramp down will work fine and make no trouble as i get .
mef3000 Posts: 81 Rating: (1)
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7/11/2010 3:01 PM	Rate (0)
Vithani Platinum Expert Joined: 7/8/2009 Last visit: 6/7/2025 Posts: 1977 Rating: (479)	mef3000 so normal stop with ramp down will work fine and make no trouble as i get . Yes, thats what I mean... Best Regards, Devesh Vithani
	I dont Like people driving Fast, thats the reason I overtake them ;)
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7/11/2010 3:08 PM	Rate (0)
mef3000 Posts: 81 Rating: (1)	thanks everyone for helping .it has been very helpful for me.
mef3000 Posts: 81 Rating: (1)
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This contribution was helpful to 1 thankful Users Vithani

1/22/2015 2:02 PM	Rate (0)
Min_Moderator Platinum Member Joined: 9/3/2014 Last visit: 3/13/2019 Posts: 4760 Rating: (122)	New question published byjagdish bhavani is split to a separate thread with the subject two drives with one VFD. Best regards Min_Moderator

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This contribution was helpful to 1 thankful Users Ste39

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