Miprom 21 - 60 faultgreenspun.com : LUSENET : Elevator Problem Discussion : One Thread
Miprom 21 Brake picks sbx output does not turn on. Generates a 60 fault. The error explination is : MSU 8253 error
My ? is what is a msu 8253 error.
-- Brian Nichols (email@example.com), October 14, 2004
I would swap the msu board out. I have had a few of them go bad. Be careful with the proms. Sorry I couldnt be more help.
-- fixalift (firstname.lastname@example.org), October 14, 2004.
all boards have been changed this has been going on sence install
-- brian (email@example.com), October 15, 2004.
In that case more info is needed. What drive is in it, motor info, thats kind of surprising that Kone would leave that they are very responsible around here and I have alot of friends that work for them. I would definately start looking at stuff within the drive system. It might be a problem for Kopne to have their engineers take a look at. It happens to everyones equipment once in a while. If you give me more info I will try to help you out. I adjusted some of these with the old analog drives.
-- fixalift (firstname.lastname@example.org), October 17, 2004.
The problem is more than likley the velocity encoder shield connections. Encoder shield must be grounded at the terminal box and not connected to the shield that is grounded at the drive. Check the prints to insure that it is wired properly.
-- Lowell (email@example.com), October 17, 2004.
The problem with the gearless machines (60 fault miprom21) turns out to be electrical noise transmited from the machine to the non isolated encoder. The fix was an anti dither module from BFI. Thanx to all that responded.
-- brian (firstname.lastname@example.org), October 19, 2004.
An interesting thread and oft repeated answer to resolve the problem. Electrical interference with the encoder is quite common. Many installers learn the hard way that the solution is to electrically insulate the encoder case and shaft from the motor.
AC and DC drives, SCR and/or PWM, all have the same noise coupling issue. Some drive and motor combinations will create more EMI than others. Some encoders work better than others. Consequently some non-isolated installations work better than others. But practically every installation will benifit by insulating the encoders.
Saves a lot of grief is you simply do it right the first time. See incoder installation notes at www.elevatordrives.com.
-- Don Vollrath (email@example.com), October 27, 2004.