DiaperWolf
Member
Hey,
Ran into this issue while commissioning on customer site. Background info first:
Hardware Setup as follows
5/04 CPU
Tank Pump 1100 gpm (desgn. flow to sump) via Pwflx 700 VFD
Sump Pump 1300 gpm (desgn. flow to tank) via Pwflx 700 VFD on remote i/o via DH+
I'm currently using an SCP to scale my "actual" tank level (0-10V) transducer....and the same thing on the sump side.
so the SCP for both the tank and sump would automatically increase the 4-20ma output (using a 1746-NI04I) for the VFD run command. higher tank/sump level=faster run signal.
My level control worked perfectly (+- .5") until we had to adjust a throttling valve on the tank side, just closed it down 1/8 of range...
now I'm into +- 1.5/2" of water. the tank vfd speeds up, level drops, then the vfd slows down, level rises. I can't smooth it out. Any ideas?
Ran into this issue while commissioning on customer site. Background info first:
Hardware Setup as follows
5/04 CPU
Tank Pump 1100 gpm (desgn. flow to sump) via Pwflx 700 VFD
Sump Pump 1300 gpm (desgn. flow to tank) via Pwflx 700 VFD on remote i/o via DH+
I'm currently using an SCP to scale my "actual" tank level (0-10V) transducer....and the same thing on the sump side.
so the SCP for both the tank and sump would automatically increase the 4-20ma output (using a 1746-NI04I) for the VFD run command. higher tank/sump level=faster run signal.
My level control worked perfectly (+- .5") until we had to adjust a throttling valve on the tank side, just closed it down 1/8 of range...
now I'm into +- 1.5/2" of water. the tank vfd speeds up, level drops, then the vfd slows down, level rises. I can't smooth it out. Any ideas?