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Showing results 1 to 25 of 500 Search took 0.14 seconds. Search: Posts Made By: jraef

Forum: LIVE PLC Questions And Answers February 16th, 2021, 03:58 PM

Replies: 11 power flex drive 753 allen bradlley Views: 771 Posted By jraef Are you in V/Hz mode or in Induction SV Mode... Are you in V/Hz mode or in Induction SV Mode (parameter 35)? Because if you left it at the factory default you are in Induction SV Mode and the V/Hz pattern will be optimized to whatever is necessary...

Forum: LIVE PLC Questions And Answers February 15th, 2021, 05:19 PM

Replies: 11 power flex drive 753 allen bradlley Views: 771 Posted By jraef If the drive is being over loaded, and you have... If the drive is being over loaded, and you have set the response to try to avoid shutting down, it will respond by altering (restricting) the maximum frequency that you can run at. In the PF753, this...

Forum: LIVE PLC Questions And Answers February 15th, 2021, 04:48 PM

Replies: 8 Power outage notifications. Views: 418 Posted By jraef If you have equipment "that needs to be running... If you have equipment "that needs to be running at all time", do you not have a backup generator? If so, and there is an Automatic Transfer Switch involved, most of them have the ability to provide...

Forum: LIVE PLC Questions And Answers February 15th, 2021, 04:43 PM

Replies: 11 Junction Box Vs Industrial Control Panel? Views: 576 Posted By jraef This is confirmed by the definition of an... This is confirmed by the definition of an "industrial control panel" in the US National Electric Code. There is no definition of a "junction box" but it is referred to in many places, along with...

Forum: LIVE PLC Questions And Answers February 11th, 2021, 08:22 PM

Replies: 22 OT: vertical turbine pump issues Views: 1,169 Posted By jraef What Gary said first is the likely root cause; a... What Gary said first is the likely root cause; a failure in the gate circuit of the Soft Starter. Although rare, that used to happen on the old Saftronics, Benshaw and Motortronics analog soft...

Forum: LIVE PLC Questions And Answers January 28th, 2021, 03:20 PM

Replies: 13 vfd recommendations Views: 1,203 Posted By jraef You can do all of that with a PowerFlex 523 or... You can do all of that with a PowerFlex 523 or 525. To get the "DC injection motor winding heater" function though, you have to program one of the Digital Inputs as "Force DC" to where the DC...

Forum: LIVE PLC Questions And Answers January 22nd, 2021, 01:43 PM

Replies: 14 Use of interposing relay Views: 971 Posted By jraef Been there, done that, I'll never go back. Relay... Been there, done that, I'll never go back. Relay contacts have a finite life and when they wear out, you have to replace the entire output card. I built a sortation system that used relay outputs...

Forum: LIVE PLC Questions And Answers January 22nd, 2021, 01:28 PM

Replies: 3 PowerFlex 525 Relay Outputs Views: 423 Posted By jraef Not specific to the PF525 drives, but in general... Not specific to the PF525 drives, but in general I have had issues with Safety Relay Circuits being run through standard relay contacts. The problem is that the safety circuits are not enough load to...

Forum: LIVE PLC Questions And Answers January 20th, 2021, 08:37 PM

Replies: 14 UL508A- Circuit Breaker Jumpering (control circuits) Views: 786 Posted By jraef That is EXACTLY the issue. SOME small (15-20A 1-2... That is EXACTLY the issue. SOME small (15-20A 1-2 pole) breakers (Square D QOU for example) have terminals that are UL listed for two wires per terminal. Many others are NOT, so if you chose one that...

Forum: LIVE PLC Questions And Answers January 20th, 2021, 08:25 PM

Replies: 45 USA Farm Power supply Views: 3,243 Posted By jraef I know for a fact that there are SWER systems in... I know for a fact that there are SWER systems in use in far flung regions of ranch land in Northern Nevada, out around the Black Rock desert (where Burning Man is held). I have had a couple of trips...

Forum: LIVE PLC Questions And Answers January 13th, 2021, 02:06 PM

Replies: 14 VFD question Views: 1,078 Posted By jraef It would be 400 Delta, 690 Star. 400 x 1.732 =... It would be 400 Delta, 690 Star. 400 x 1.732 = 692... The other older voltage rating was 380/660V, but that has been superseded. People still get confused...

Forum: LIVE PLC Questions And Answers January 12th, 2021, 02:42 PM

Replies: 6 Brain and Google are failing me on this adapters name Views: 574 Posted By jraef But I haven't seen a PCMCIA slot on a laptop for... But I haven't seen a PCMCIA slot on a laptop for a decade or more...

Forum: LIVE PLC Questions And Answers January 12th, 2021, 02:41 PM

Replies: 14 VFD question Views: 1,078 Posted By jraef If you apply 400V to a motor connected for 660V,... If you apply 400V to a motor connected for 660V, the motor will develop only 58% of its running torque, and more importantly, only 33% of its PEAK torque capability. Peak torque (Break Down Torque)...

Forum: LIVE PLC Questions And Answers December 30th, 2020, 01:44 PM

Replies: 4 UL508A about Servo Motors. Views: 783 Posted By jraef You would not use the 12A MCB as the LOAD, that... You would not use the 12A MCB as the LOAD, that is the PROTECTIVE DEVICE for the load. You must use the ACTUAL load for whatever that 12A MCB is feeding. But if you did it this way, you are fine...

Forum: LIVE PLC Questions And Answers December 29th, 2020, 03:34 PM

Replies: 4 UL508A about Servo Motors. Views: 783 Posted By jraef Are you wanting this for sizing the internal... Are you wanting this for sizing the internal components and protective devices feeding the servo, or for the terminals going to the motor? If this is concerning the circuit components and the servo...

Forum: LIVE PLC Questions And Answers December 24th, 2020, 06:46 PM

Replies: 42 Motor Star/Triangle Start Views: 3,682 Posted By jraef If you connect it in Delta ("triangle"), it needs... If you connect it in Delta ("triangle"), it needs 380V. If you connect it in Star (Wye), it needs 660V. 660V is now a valid voltage in some parts of the world, but is not used in North America....

Forum: LIVE PLC Questions And Answers December 24th, 2020, 06:42 PM

Replies: 5 OT *** A teaser... Views: 893 Posted By jraef Hint; Sarah Palin said she could see Russia... Hint; Sarah Palin said she could see Russia from her house!

Forum: LIVE PLC Questions And Answers December 23rd, 2020, 04:43 PM

Replies: 14 Main CB Views: 1,413 Posted By jraef I don't consider MCBs to be suitable for use as... I don't consider MCBs to be suitable for use as Main breakers on industrial controls, they are only rated for 10kAIC, most industrial plants will have more than that as Available Fault Current. I...

Forum: LIVE PLC Questions And Answers December 23rd, 2020, 04:41 PM

Replies: 16 Soft Start issues Views: 1,389 Posted By jraef You have a 16A rated soft starter. You have... You have a 16A rated soft starter. You have a 1/3HP 480V motor, the FLA is likely in the area of 0.9A. So if the motor is unloaded the current is likely even lower than that. The SMC-3 (and...

Forum: LIVE PLC Questions And Answers December 22nd, 2020, 05:26 PM

Replies: 14 Main CB Views: 1,413 Posted By jraef Correct. Look at the actual LOADS that are... Correct. Look at the actual LOADS that are connected to the devices, the motors and the power supply. Find the largest load Full Load Current rating, multiply it by 1.25, then add that to all of the...

Forum: LIVE PLC Questions And Answers December 22nd, 2020, 05:21 PM

Replies: 14 Main CB Views: 1,413 Posted By jraef I interpreted it to mean that is where he is... I interpreted it to mean that is where he is getting the information from.

Forum: LIVE PLC Questions And Answers December 17th, 2020, 08:18 PM

Replies: 5 Disconnecting the load side of a running VFD Views: 755 Posted By jraef As a set of contacts open while current is... As a set of contacts open while current is flowing, like with a contactor or disconnect, the current forms an arc across the gap until the air gap distance increases to where the dielectric is high...

Forum: LIVE PLC Questions And Answers December 11th, 2020, 04:46 PM

Replies: 22 Soft PLC's taking over? Views: 1,741 Posted By jraef Soft PLC + BSOD= total disaster... Soft PLC + BSOD= total disaster...

Forum: LIVE PLC Questions And Answers December 10th, 2020, 03:54 PM

Replies: 26 Motor Theory Education Views: 2,029 Posted By jraef Saw your response too late... Several of the... Saw your response too late... Several of the AFE drive suppliers are now allowing you to set up, in programming, the ability of allowing the VFD to EXPORT VARs to help compensate for other...

Forum: LIVE PLC Questions And Answers December 10th, 2020, 03:50 PM

Replies: 26 Motor Theory Education Views: 2,029 Posted By jraef By "they" I assume you mean the utility? ... By "they" I assume you mean the utility? They don't know, or care, how you correct the PF, they measure the VARs you require and use that to penalize you. If you use PFC capacitors to provide the...

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