The only 6010's I worked on used MFS sw's. A few later ones used what they called the MST selector in conjunction with an encoder driven by the drive sheave. The MST used an encoder with vanes. in the hoistway. This was prob. something they were planning to do before the MiProm 21's came out. Is this the only form of selector? There almost has to be MFS sw's or an encoder also. I wonder if they were using this to make sure they weren't exceeding the 150 fpm on inspection. Let us know the outcome, please.
