can a variable speed controller run a relay?

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mtmtntop

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i have a tekmar 157 controller which runs the primary pump for a solar array at a variable speed. i was wondering if i can run a 120 v relay off of this lead. i am unsure if varying the speed affects the voltage or amperage. if it reduces the voltage, i do not think it can operate the coil. anyone know? thanks
 
tekmar Difference Setpoint Control 157
I can't tell from this link.
Relays generally pull in at 2/3rds rated voltage and drop out at 1/3rd rated v.
 
Can you use the secondary pump output in Mode1 to drive the relay?

 
Last edited:
no, that won't work. i wanted to open a zone valve when the primary pump was activated. it looks like i may have to do this via an aquastat and temp sensor.
 
on second thought maybe it will. re reading your post, it has power whenever the pump 1 is operating greater than zero. i hadn't thought of using the p2 lead. thanks alot! i guess i need to read the instructions more creatively next time.
 
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