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  • Users: tjmurf
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  1. tjmurf

    Powerflex 755 (15 hp) IGBT SMOKED!

    The IGBT practically blown off the board, some traces destroyed. Questions: Does the SK-R1-MCB1-PF755 board control the firing of the power electronics? Would it be UN-advisable to test the mother board in an identical frame? I'm unsure of the architecture of this drive The HIM is still...
  2. tjmurf

    AB E300 overload module

    Has anyone ever had an E300 module that WILL NOT separate. The control (middle) module will not separate from the Base module. The plastic slide is down but is offering a lot of resistance. Also can anyone identify the error on this module...
  3. tjmurf

    Hall Effect Sensor ID

    Was hoping someone might assist with a part identification. The sensor appears to be an Allegro and a Hall Effect. I'm just not certain of the specs. to replace or change. It's to a wind speed sensor. Any help would be appreciated! Thanks! TM...
  4. tjmurf

    Acuvim-II

    Is it possible to scale the analog output to a lesser value than the full current of the CT's. I am using a Acuvim-II meter with 400 amp CT's I would like to scale the analog output down to 60kW total power, without loosing resolution. I'm using the instrument to monitor and compare the power...
  5. tjmurf

    Diode ID?

    The attached are in SMA packages. I can't find any information on the "CODES" to cross referance. Can anyone help?
  6. tjmurf

    Piston vs Diaphram

    We are needeing to replace a 12.25" duplex piston / plunger pump with 4" inlet and discharge. The process in un-screened primary domestic waste sludge. Is this the right pump for the application? How will a diaphram pump compare to a plunger in this application? This is a high grit and...
  7. tjmurf

    Hypochlorite scaling

    Hi, I was wondering if anyone has had any experience using vacuum injection as a method to supply Hypochlorite? I would like to utilize some of the existing CL2 components while converting from Gas to Hypo. W&T offers a chlorinator for such use, LVN-2000. In reading the literature, the pit...
  8. tjmurf

    TVSS options

    My question is about TVSS manufactures and technologies. We are in the process of replacing / upgrading the main services into our Waste Water treatment plant. The designing engineer has specified a sole manufacture for the TVSS equipment. The only major difference I find between the device...
  9. tjmurf

    Motor / Pump cooling.

    Motor and pump cooling application: Would it be safe to assume that the difference between brake hp and water hp equals the power loss through the application? This loss will equal the heat that the pump and motor will create and must be removed / cooled. Example: 100% duty cycle. Water hp...
  10. tjmurf

    Reduced Voltage Starter?

    Is there a minimum motor HP size where reduced voltage, soft start or other controller should be used rather than across the line starter. This is assuming 3 phase 460 volt motors. Also assume the driven load does not require a reduced tork start. Thanks! TM
  11. tjmurf

    3 pump Lift Station

    Gentlemen; Please help me out here. What is the best operational sequence to operate 3 identical centrifugal pumps which are driven with VFD's. This is in a sewage application so the load varies. In single pump mode everything is straight forward. The speed will vary between two level points...
  12. tjmurf

    Snails

    Has anyone ever had problems with snails in a RBC treatment system? What have you done to eliminate or control the problem?
  13. tjmurf

    Wireless Network

    I didn't get much feedback from the PLC forum. I would like install a wireless network, "ETHERNET/IP". I'll have 6 nodes, three of them will be wireless. What componets will I need for the wireless side of things. The hard wired end is pretty straight forward. The furthest...
  14. tjmurf

    Wireless SLC network

    Does anyone have much experiance with wireless networking using SLC's As usual, the AB solution is very expensive. I like the ethernet speed but don't the $2000.00+ price tag for each 505. I am going to settle with 503's What advantages are there using a DF1 to ethernet converter...
  15. tjmurf

    3-phase vs SGL phase starting torque

    The Application / Problem: 5 hp 230 volt single phase motor driving a constant torque load, which is a gear pump. The process is an asphalt emulsion and, at times thick slugs of this stuff will load down the motor to near locked rotor conditions. Before the overload protection trips, the start...

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