Technical Forum

MICROMASTER

crane travelling system

Thread Starter: Sulung   Started: 10/10/2007 7:36 AM   Replies: 8

« Previous thread Next thread »
Page 1 of 1 (9 items)
  10/10/2007, 7:36 AM
Joined 5/26/2007
Last visit: 7/15/2014
Posts: 123
Rating:
Rated: Excellent [4.33 out of 5 / rated 3 time(s)]. (3) 
Rated: no ratings [0 out of 5 / rated 0 time(s)]. (0) 
Hi everybody,
We are going to upgrade our travelling system.
our existing system use a induction motor (22 kW, 380 VAC, 3 phase) to rotate a DC generator (18,5 kW 1450 rpm 440VDC), the output from this DC generator are feed to 4 DC motor (3,7kW 1150 rpm 220VDC). This DC motor is used to move our crane, two above and two below.
Now we are going to renew it by using 4 induction motor. this motor will be control by 4 inverter. we are going to use 380VAC 3 phase induction motor. The whole 4 motor should move at the exact speed, it will be control by plc. the operator just need to move the crane forward and backward. Could anybody suggest the inverter and motor for me?
Top
  10/10/2007, 4:18 PM
Joined 8/26/2007
Last visit: 6/20/2011
Posts: 23
Rating:
Rated: Outstanding [4 out of 5 / rated 2 time(s)]. (2) 
Rated: no ratings [0 out of 5 / rated 0 time(s)]. (0) 
I suggest a S120 is OK for this , a control unit CU320 , a infeed moudle , the infeed type you can select basic , smart , active depend on the power and the motor work mode , two double motor moudle , 4 ac induction motor with encoder Vector or 4 serv motor with encoder depend on the precision you want .
and maybe need 4 encoder moudles
Another projects 4 G120 converters 4 ac induction motor with encoder .
  or 4 MM440 converters 4 ac induction motor with encoder .
Hope this helps...



=== Edited by Zcomin @ 11.10.2007 17:42 [GMT ] ===


Top
  10/13/2007, 12:15 PM
Joined 5/26/2007
Last visit: 7/15/2014
Posts: 123
Rating:
Rated: Excellent [4.33 out of 5 / rated 3 time(s)]. (3) 
Rated: no ratings [0 out of 5 / rated 0 time(s)]. (0) 
Thanks Zcomin. I heard that instead of using 4 converter for 4 AC motor, we could use one converter to drive the whole 4 AC motor. any idea?
Top
  10/14/2007, 6:05 PM
Joined 8/26/2007
Last visit: 6/20/2011
Posts: 23
Rating:
Rated: Outstanding [4 out of 5 / rated 2 time(s)]. (2) 
Rated: no ratings [0 out of 5 / rated 0 time(s)]. (0) 
use one converter to drive the whole 4 AC motor. I think this is  a easy and cheap solution . if  you do not need very precision . and the load is not very big . because the converter can only works V/F mode .
Top
  10/15/2007, 6:03 AM
Joined 5/26/2007
Last visit: 7/15/2014
Posts: 123
Rating:
Rated: Excellent [4.33 out of 5 / rated 3 time(s)]. (3) 
Rated: no ratings [0 out of 5 / rated 0 time(s)]. (0) 
you mean just parallel 4 AC motor to the output of the inverter? i do not need precision travelling, the traveling will be controll by the operator manually. do i still need encoder to make sure that each motor travel at the same speed and length?
Top
  10/16/2007, 6:24 PM
Joined 8/26/2007
Last visit: 6/20/2011
Posts: 23
Rating:
Rated: Outstanding [4 out of 5 / rated 2 time(s)]. (2) 
Rated: Above avarage [3 out of 5 / rated 1 time(s)]. (1) 

do not need encoder , but need 4 over temperature relays for

protect the motor not over current . each motor cennect to each

relay then each realay connect to the inverter , and select the

inverter current bigger than total 4 motors .

Hope this helps...

Top
  10/18/2007, 12:59 PM
Joined 9/7/2007
Last visit: 10/18/2007
Posts: 5
Rating:
Rated: Above avarage [3 out of 5 / rated 1 time(s)]. (1) 
Rated: Above avarage [3 out of 5 / rated 1 time(s)]. (1) 
We have done this type of application many times with MM440. Just make sure that you are using 4 identical motors with identical slip caracteristics. This way you will have good load sharing between the motors.

Regards

Pierre
Top
  10/20/2007, 10:52 AM
Joined 5/26/2007
Last visit: 7/15/2014
Posts: 123
Rating:
Rated: Excellent [4.33 out of 5 / rated 3 time(s)]. (3) 
Rated: no ratings [0 out of 5 / rated 0 time(s)]. (0) 
Thanks for your inputs. i got some question:
1. to Zcomin, you suggest to use temperature relay, do you refer to 3RS10 00-1ck10? should i put the sensor on the motor body? thanks

2. to piere, what kind of protection do you use? could you give me an example of your project? thanks
Top
  8/4/2010, 10:39 PM
Joined 6/19/2008
Last visit: 2/22/2013
Posts: 6
Rating:
Rated: no ratings [0 out of 5 / rated 0 time(s)]. (0) 
Rated: no ratings [0 out of 5 / rated 0 time(s)]. (0) 
blush Suppose this thread is closed. Why upgrade to AC ? Use 4 small 6RA70 DC drives ?
Top
Page 1 of 1 (9 items)
Actions