The machine sounds nice, similar to Schindler's Dynatron drive since they both use thyristors but that's ACVV and this is AC/2. We had some Fiam lifts installed over here in the past, but now most are just sadly left in a derelict condition or the building was demolished.
@@TkysAlt The dynatrons are very hard on motors and thyristors as they essentially vary the AC to the high speed winding while injecting dc into the slow speed in an inverse proportion, using a 2 speed ac motor is much easier to control as the slow speed motor has huge torque compared to a high speed with lots of DC, most two speed AC installs will accelerate and decelerate above 1m/s2 while an injected high speed AC or VF won’t have the torque to do that (on most of the conversions at least), the express VAC2 system would essentially reverse the thyristor bridge to slow the machine down giving fantastic performance but a lot of noise from the motor
Quick question - if the flip-flop module PCB is on the bench, has the actual design of the floor positioning been changed/updated, or was that just a spare board on the bench?
@@mrmattandmrchay in the nineties we couldn’t get quality relays to repair them if they failed so many were replaced with a plc just to do the counting logic, the spare one was kept when the other lift was removed (along with the motor) as they went up an extra floor with an mrl lift. There is a metal cover over the one in the lift that is still working just under the (express) phase failure.
Very interesting, I watch all of your videos and some really unique stuff you come across. Thanks for the uploads.
I love the 2 speed ac elevators but they are all but gone here in the US
The machine sounds nice, similar to Schindler's Dynatron drive since they both use thyristors but that's ACVV and this is AC/2. We had some Fiam lifts installed over here in the past, but now most are just sadly left in a derelict condition or the building was demolished.
@@TkysAlt The dynatrons are very hard on motors and thyristors as they essentially vary the AC to the high speed winding while injecting dc into the slow speed in an inverse proportion, using a 2 speed ac motor is much easier to control as the slow speed motor has huge torque compared to a high speed with lots of DC, most two speed AC installs will accelerate and decelerate above 1m/s2 while an injected high speed AC or VF won’t have the torque to do that (on most of the conversions at least), the express VAC2 system would essentially reverse the thyristor bridge to slow the machine down giving fantastic performance but a lot of noise from the motor
I like most of the Fiam controllers have been retro fitted with an Express phase failure
Quick question - if the flip-flop module PCB is on the bench, has the actual design of the floor positioning been changed/updated, or was that just a spare board on the bench?
@@mrmattandmrchay in the nineties we couldn’t get quality relays to repair them if they failed so many were replaced with a plc just to do the counting logic, the spare one was kept when the other lift was removed (along with the motor) as they went up an extra floor with an mrl lift. There is a metal cover over the one in the lift that is still working just under the (express) phase failure.