|
|
| Re: MP14; End of the Paris Door Buzzer sound? (1560700) | |||
 |
|||
| Home > SubChat | |||
|
[ Read Responses | Post a New Response | Return to the Index ] |
|
||
|
Re: MP14; End of the Paris Door Buzzer sound? |
|
|
Posted by nasadowsk on Sun Nov 1 10:59:11 2020, in response to Re: MP14; End of the Paris Door Buzzer sound?, posted by New Flyer #857 on Sun Nov 1 07:18:39 2020. What I remember from my elevator controls days was that once the car was in the 'door zone', and below a certain speed on the drive, it was committed to stopping no matter what, too. Only at that time would the doors start opening, which would drop the drive contactor out, and then the brake after a slight delay. It made a characteristic pop pop pop pop noise on the control board.Putting a contactor downstream of a drive was typically not done back then, except in safety situations. These days, you'd use the STO contacts to instantly drop the output of the drive, but still have a downstream contactor in this application. STO is also used when there's a disconnect after the drive to prevent the drive from blowing up. |
|
(There are no responses to this message.)
|
|