Prologue
Our facility uses a 10 MVA, 69kV:12470V transformer to feed a mixture of 12470:480 transformers (mostly delta-wye, but with one 3750 KVA delta-delta, and a 2500 KVA wye-wye). The utility doesn't charge for low power factor, but we're planning several process line additions, and must...
We have a mix of I-R and Kaeser air and water cooled rotary screw air compressors. Our plant's ambient air has enough dust (plastics fines, cardboard dust, and, since the equipment room is adjacent to the maintenance department, often influxes of other types of dirt), and in all cases we've...
We use a four cartridge stainless steel filter cartridge housing equipped with Parker T23R10A, 5 micron, wound polypropylene filters. These filter cartridges are 10" long x 2-1/2" OD x 1.0" ID, and rated for 4 GPM max. at 140°F max.
Chilled water at 55°F nominal comes into the filter from the...
I've become familiar with the rule-of-thumb for a minimum one gallon of receiver capacity per SCFM of compressed air generation from several online sources, but none I've read so far get into any details.
Three questions:
1). Does the 1 gallon/CFM rule of thumb apply only to installed air...
We have a material loading and blending control system built using proprietary digital and analog I/O boards, 16 position keypad interfaces, and CPU control board manufactured by "Advanced Controls and Measurements, Inc.".
We're in the process of replacing the control systems with ones built...
The pictured Bussman FLS-R 500A fuse was installed in a Square D I-Line bus plug-in disconnect feeding an ABB DCS401.0500 drive (rated 408 AC amps/phase) driving a Reliance "Super RPM" 250 HP, 500V/400 FLA motor in a plastics extrusion screw application. The drive itself is protected with...
HCBFlash suggested this forum may be more applicable to the question at hand, but I could find no guidance in the site policies on how to pull this off without being considered cross-posting, so here goes.
The gist of the question is what constitutes the green corrosion that builds up on copper...
On old motor installations it isn't uncommon to find green corrosion in copper wires. By the time this occurs there are often other reasons such as insulation degradation to support replacing the wire runs, but regardless, I've always believed this corrosion sufficient to recommend replacing the...
The situation: Two 4x4 membrane switch keypads are used in a proprietary control system. The OEM doesn't want to support the system anymore, and will no longer supply the keypads. These keypads plug into a proprietary circuit board which contains keyboard decode circuitry, and I2C addressing and...
When reading through manufacturer's specifications for electromagnetic relays there is almost always a 'mechanical life' spec, often an electrical life spec for non-inductive loads, and sometimes one for inductive loads.
In this case, I'm looking at a Phoenix Contacts #2961105 relay used in...
Wondering if there are any rough rules of thumb for estimating polymer melt pump service life. While performing data logging on one of our 4-1/2" APET lines for an extruder screw load instability problem noted pump discharge pressure was much lower than expected.
For a suction pressure of 850...
We've recently had a five year old General Electric ED&C oil-filled pad mount transformer fail. It is rated 3000 KVA/OA, and 3750 KVA/FA with a 65°C rise, and uses aluminum windings on both primary and secondary. This transformer was relatively lightly loaded (line amps are typically in the...
Background Info
A Reliance B507ATZ frame, 250HP, 1750 RPM base speed (2300 RPM fully field weakened) 500VDC/400A armature, stabilized shunt, 300 VDC shunt field (4.84A hot/1.1A fully weakened)DC motor is used to turn a plastic extruder screw. This extruder is equipped with a melt pump between...
I've been looking (so far, unsuccessfully) for DIN-sized blank out plates - 1/16 DIN, in this case - similar in function to the Hoffman Hol-Tite (TM) line of plugs used to blank out circular holes.
There appear to be several sources of adaptor plates (for instance, from 1/4 to 1/16 DIN), but...
