motor used simultaneously

[The apprentice]

Hi there, i will be on a job soon that requires two motors to control a belt that delivers grain to the opposite end of a grain shed these motors need to run simultaneously. this is due to the length of the shed which id say is 72 meters one motor at the start of the belt and another 72 meters away my question is how would you wire the two motors in series with a start stop control? isolator for both motors and also a start stop thanks in advance appreciate it

 

[James]

What type of motor?
are they fixed or variable speed?

 

[The apprentice]

What type of motor?
are they fixed or variable speed?

fixed motor mate sorry ment to say 3 phase motor will just be a standard belt motor with switching

 

[James]

I would use 2 dol starter boxes, one each end of the belt.
wire the stop buttons in series and the start buttons in parallel (fed from one end only)

 

[James]

Draw out what you think the wiring will be and we can give you some pointers if required.

 

[The apprentice]

I would use 2 dol starter boxes, one each end of the belt.
wire the stop buttons in series and the start buttons in parallel (fed from one end only)

yeah iam go look into it more mate thanks for the advice

 

[The apprentice]

Draw out what you think the wiring will be and we can give you some pointers if required.

thanks mate will do

yeah iam go look into it more mate thanks for the advice

using 2 do

I would use 2 dol starter boxes, one each end of the belt.
wire the stop buttons in series and the start buttons in parallel (fed from one end only)

using 2 dol starter boxes will overide the two boxes if i just use a start stop at the entrance of the grain store ?

 

[The apprentice]

thanks mate will do

using 2 do

using 2 dol starter boxes will overide the two boxes if i just use a start stop at the entrance of the grain store ?

could

 

[James]

You still need an overload for each motor.

 

[The apprentice]

right ok al have a look

You still need an overload for each motor.

yeah

You still need an overload for each motor.

thanks mate could anyone draw this for me iam an apprentice i know its a big ask but i like to take the time to learn

 

[The apprentice]

You still need an overload for each motor.

anychance anyone can draw this for me

 

[DPG]

anychance anyone can draw this for me

Are you doing this install on your own?

 

[The apprentice]

Are you doing this install on your own?

no mate but would like a grasp on things with me being an apprentice i couldstudy the drwing

 

[DPG]

no mate but would like a grasp on things with me being an apprentice i couldstudy the drwing

Fair point.

 

[Petej999]

Can you not get the leccy in charge to draw it out for you? or are you being dropped in at the deep end by an unscrupulous boss?

 

[The apprentice]

Can you not get the leccy in charge to draw it out for you? or are you being dropped in at the deep end by an unscrupulous boss?

not being dropped in the deep end mate, love what i do and find motors interesting this job was walked of and said others will do it but id like to learn it

 

[Petej999]

not being dropped in the deep end mate, love what i do and find motors interesting this job was walked of and said others will do it but id like to learn it

good for you mate. but everyone needs some help sometime, seen plenty of bosses/managers give jobs out to people just so it looks good on them, no shame in no knowing especialy if you are still learning, just wondering that's all good luck

 

[The apprentice]

good for you mate. but everyone needs some help sometime, seen plenty of bosses/managers give jobs out to people just so it looks good on them, no shame in no knowing especialy if you are still learning, just wondering that's all good luck

thanks mate i love doing what i do and obsessed with electrics dont ask me why but just iam

 

[Darkwood]

This can be a simple 2 contactors with overloads pulling in with the same coil signal or we can get very complex and fit vsd's that track as a master and slave... depends on the nature and precision required.

 

[The apprentice]

This can be a simple 2 contactors with overloads pulling in with the same coil signal or we can get very complex and fit vsd's that track as a master and slave... depends on the nature and precision required.

Possible diagram mate? Thanks a lot

 

[pc1966]

This can be a simple 2 contactors with overloads pulling in with the same coil signal or we can get very complex and fit vsd's that track as a master and slave... depends on the nature and precision required.

Do VSD offer the equivalent of torque control for this sort of thing?

For big DC servos that needed zero backlash it was a common trick to have the armature current deliberately offset by a small-ish amount so the two motors would have a more or less constant tension between them to take up free play on the drive train, but I have never had to look at the AC motor equivalent (so far).

 

[Petej999]

thanks mate i love doing what i do and obsessed with electrics dont ask me why but just iam

You'll get over it Mate ha ha

 

[Darkwood]

You can achieve really anything now with ac motors that dc was often spec'd for, closed loop ac with encoder can deliver 100% torque at 0.5hertz, you can incorporate a feed back from say a dancer arrangement to either maintain a torque or set speed along a line of several motors.
I have done them in the past but can be very complicated to do if your just dipping your toe in.