Slwagner73
Lifetime Supporting Member
Gents:
Quick rundown.
Water pump, 75ft of head pressure on a 10” line, open at the discharge end to a pond. (Per customer).
755 75hp 480VAC 3ph.
75hp 230/460 motor, 170/85.1 amp, 1775 rpm.
I ran the setup wizard for this, did the usual rotation check, and then did the static tune. Every thing came out just fine, and the pump starts and runs like it should, amps match hz’s, everything looks good until you go above 40hz.
Then the amps really climb, going way over 110 amps at 50hz. At which point it faults on overcurrent. That’s kind of a no-brainer, it’s doing what it should.
Long story short, I have no idea what could cause this.
The pump is belt driven, the discharge valve is wide open, and the check valve “appears” to be functioning.
This pump ran fine at 30-35hz for a week, but now they want to ramp it up higher, and like I stated, you see the results.
Now I’m stumped.
Quick rundown.
Water pump, 75ft of head pressure on a 10” line, open at the discharge end to a pond. (Per customer).
755 75hp 480VAC 3ph.
75hp 230/460 motor, 170/85.1 amp, 1775 rpm.
I ran the setup wizard for this, did the usual rotation check, and then did the static tune. Every thing came out just fine, and the pump starts and runs like it should, amps match hz’s, everything looks good until you go above 40hz.
Then the amps really climb, going way over 110 amps at 50hz. At which point it faults on overcurrent. That’s kind of a no-brainer, it’s doing what it should.
Long story short, I have no idea what could cause this.
The pump is belt driven, the discharge valve is wide open, and the check valve “appears” to be functioning.
This pump ran fine at 30-35hz for a week, but now they want to ramp it up higher, and like I stated, you see the results.
Now I’m stumped.