Refrigerated lorry hook up points

Knobhead · Oct 16, 2011

This may make you laugh. As an apprentice I was appointed as “assistant” site engineer on a new plant. Came the great day of switching on power to the MCC, Oh dear what a f**k up. The contracting foreman was adamant all drives will run the correct way.
A motor connected RYB to ABC will turn CW when looking at the shaft.
I was going purple around the gills when I explained to him the works had it’s own power station and it ran opposite to the grid! Every (over 100) motor had to be changed at the terminal box.

Inteificio · Oct 24, 2011

Why was the generator run back to front?

malcolmsanford · Oct 24, 2011

silva.foxx said:
What happens with respect to phase rotation?

Is there a device on the fridge system that ensures correct rotation?

Irrelevant response to OP's question... but just thought I'd ask.

All the ones I have done Silva had phase failure relays on the units for phase rotation and single phasing problems.

Knobhead · Oct 24, 2011

The original two power satiations were installed in the early 1930’s. They were linked by two 11KV lines, which had the distinction of the longest spans in the country at that time. Various other plants were connected of the two main interconnects. At that time the company had over 100 different sites in the area. There was no connection to the grid then, there wasn’t one to speak of. So when the day came to connect to the grid we were going backwards in relation to the rest of the country! Simple answer was to swap the boards phases over. The confusion lasts up until this day.