dtpetty

We have just started replacing a number of aging 1305's with PowerFlex 40 drives. The 1305's are "double sized" for the motors. In other words a 4A 2HP drive for a 2A 1 HP motor. Is this considered best paractice?. Any downside other than additional cost? I seemed to have a problem driving a 1 HP 60HZ motor with a new 10A 5HP drive. The cable length is moderate (maybe 30 ft). It's running at fairly low freq (9 Hz). It's possible I had a paramerter wrong (it was a quick and dirty, keep running fix). The drive would overload (F 07) at anything over a couple of Hz. We are currently planning to keep the oversizing with the new drives as it seems logically conservative for long life and reliability. Any comment?

Correct - Dry contacts are used for control. User manual says 5 VDC internal P.S. for control. "Do not apply external voltage" So that would be sinking. The external 120 VAC we use through the "programmable output" terminals to energize a relay to drop the preset with a fault. They call them "relay" on the PowerFlex 40. The 1305 rates them @ 115VAC or 30 VDC. Can't find a rating in the manual yet for the PowerFlex. Wiring diagram shows a coil and 2 contacts but I suspect it's solid state. Drive energizes said relay shortly after power up with no fault. Work around will be to replace our fault relay with a 24V one. What I'm trying to find now is the rating of the internal power supply to see if enough current for the relay. Else I'll have to put in an external 24VDC P.S. in each cabinet. We're running now with no fault notification just to get us through Christmas. (I'm with USPS, and this is crunch time. Not a good time to be having drives blow up :). The initial problem was that I followed AB's "1305 to PowerFlex 40 Conversion" pub. It had a handy table with terminal equivalents. Turned out ever one was wrong! Start and stop reversed - reverse where enable belonged etc. Thanks for your prompt reply.

We are getting ready to begin replacing AB 1305's with Powerflex 40's. Using AB's literature on 1305 to Powerflex replacement we wired it up but cannot get the motor to run either from the keypad or through the PLS. A very basic question first: Will the Powerflex even accept the 120 VAC inputs that the 1305 is using? All of the docs only talk about 24 VDC.

A little background: I have been messing with (modifying ladder & GUI) on a system running on A SLC 5/04 with Logix500 as the programming enviornment and RSView32 for the GUI. I guess was is a fairly comlex system with about 30 routines and 1000 rungs. We have now been upgraded to Logix 5561 hardware with Logix5000 & thankfully still RSView32. The old program was pretty much brute force logic - i.e. a lot of almost identical routines with equivalent rungs just different sensors & motors. The new system has 129 routines and who knows how many rungs. It's doing pretty much the same thing (no changes to the hadware being controlled) but in a much more struture to the logic. Biggest changes I see are the plain language tags vs addresses (nice) and the arrays of tags. (Takes a bit more programming when I just want to modify one element). Enough background! The question I have today is about contoller tags. Let's say I have an array - config(21).my_bool_prop. I can see in the "monitor tags" window that each element has a default value (0 or 1). While in "remote run" mode I can modify values for elements and the change happens immediately. (So far, so good). But the next day the values have reverted back to their "defaults". How do I modify permanetely or change the default - same thing I guess. Thanks in advance for your help.