[lukebarber]

So I'm getting ready to wire up my control box and have some questions. I bought two Red Lion PID controllers to control a pump for HERMS recirculation, and to control the heater in my HLT.

http://www.clrwtr.com/PDF/Red-Lion-Controls/Red-Lion-Limit-Alarms.pdf

Now I'm reading the instructions and wondering if there is anyone using a PID like this to control a pump, in PID mode? It seems to me that if you set the cycle time to something big, like the max 125 seconds, perhaps it might work. Or this might just be a bad idea and stress the motor. The motor is a Lenze.

http://www.actechdrives.com/PDF/Lenze/Lenze-MD-MH-Motors.pdf

[weazletoe]

I think if it were myself, is wire a relay, SSR or hard,
 to the "alarm" side of the PID and let that take care of the pump.