Hello all. Another newbe...
Reworking on the old grinder. Installed new softstart, new contactors, sensors... Machine is ready to go exept for the magnet. Imagine big turntable where operator put big chunk of metal. That truntable start rotating and another tool from the top start grinding same chunk of the metal. Turntable needs to be magnetised in order for part NOT to flu from it.
Plc used is MicroLogic 1200, program that I am working with is RSlogic 500. Have DC drive that is suppling + - to the magnet. To supply supply power to the turntable (magnetize) it is simple, now my problem is how to de-magnetize. I am stuck there. Need help if someone can "push me" in the right direction.
Inputs are:
1. Magnet on - push button - start magnetising
2. Magnet off - push button - start de-magnetization.
Outputs are:
3. DC Drive - run
4. Contactor C1 - for delivering + - voltage
5. Contactor C2 - for delivering - + voltage
6. Resistor bank 1
7. Resistor bank 2
8. Resistor bank 3
9. Resistor bank 4
- resistor banks controling the speed of the dc drive
Basicly, when magnetising:
4 on
6, 7, 8, 9 on - to get max voltage reference to the drive
timer 1/2 sec
3 on
when de-mag:
3 off
timer 1 sec
9 off - decreasing the speed of the drive
4 off
5 on
timer 1/2 sec
3 on
timer 1 sec
3 off
timer 1 sec
8 off
5 off
4 on
.......... and continiue like that with contactors changing in order to change the polarity and resistors droping down in order to decrease the speed until 0. Last step will be drive off, 1/2 sec delay and then last contactor drop out.
Timers are used in order to protect drive from backfeed (in addition of power resistors and other rectifiers which are allready installed on the machine).
I understand that sequencer will be the best in this case, however, i can not get it to work properly. I guess, not enough experiance.
Thank you in advance and sorry about spelling...
p.s. Just to clarify something, fisical outputs are NOT one after another. There is different voltage that is used, plc is relay type. I guess that sequencer is out of the question...
Reworking on the old grinder. Installed new softstart, new contactors, sensors... Machine is ready to go exept for the magnet. Imagine big turntable where operator put big chunk of metal. That truntable start rotating and another tool from the top start grinding same chunk of the metal. Turntable needs to be magnetised in order for part NOT to flu from it.
Plc used is MicroLogic 1200, program that I am working with is RSlogic 500. Have DC drive that is suppling + - to the magnet. To supply supply power to the turntable (magnetize) it is simple, now my problem is how to de-magnetize. I am stuck there. Need help if someone can "push me" in the right direction.
Inputs are:
1. Magnet on - push button - start magnetising
2. Magnet off - push button - start de-magnetization.
Outputs are:
3. DC Drive - run
4. Contactor C1 - for delivering + - voltage
5. Contactor C2 - for delivering - + voltage
6. Resistor bank 1
7. Resistor bank 2
8. Resistor bank 3
9. Resistor bank 4
- resistor banks controling the speed of the dc drive
Basicly, when magnetising:
4 on
6, 7, 8, 9 on - to get max voltage reference to the drive
timer 1/2 sec
3 on
when de-mag:
3 off
timer 1 sec
9 off - decreasing the speed of the drive
4 off
5 on
timer 1/2 sec
3 on
timer 1 sec
3 off
timer 1 sec
8 off
5 off
4 on
.......... and continiue like that with contactors changing in order to change the polarity and resistors droping down in order to decrease the speed until 0. Last step will be drive off, 1/2 sec delay and then last contactor drop out.
Timers are used in order to protect drive from backfeed (in addition of power resistors and other rectifiers which are allready installed on the machine).
I understand that sequencer will be the best in this case, however, i can not get it to work properly. I guess, not enough experiance.
Thank you in advance and sorry about spelling...
p.s. Just to clarify something, fisical outputs are NOT one after another. There is different voltage that is used, plc is relay type. I guess that sequencer is out of the question...
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