Exactly. One of the gotcha's is if there is a power failure and the pump has overrun. My component solution handles this.
Aside:
I once had an interesting problem. Leave the valve in the same position it was before power went out. The turbomolecular pump and valve was generator backed up, so the 1 minute off before the generator would start would drop out the air operated valve. Closing briefly was fine.
There were a few other systems which had generator backed up cryopumps and if the power was off for 5 minutes or more, you should leave the pump off. If less than 5 minutes, it would be beneficial to leave it on. I never worked on that problem. If power was out for more than 5 min, it would take about 8 hours to defrost and restart the pump.
In yet other systems which had near liquid nitrogen refrigeration systems, the control system would have been a lot tougher with heaters and valves to control. The, not so good system, just dropped out the diffusion pump system and closed a few valves. Idealy, the amount of time power was out or temperature should have determined what happened during recovery. Heaters, valves and refrigeration system would need to be controlled. We did not have the generator capacity to backup the three 5 HP refrigeration systems.
Useful stuff, but management made the ultimate decision.