flux_527
running
-----] [---+---|GSV |---------+---
| |WallClockTime| |
| |LocalDateTime| |
| |DT[0] | |
| |
+---|DTR |---|ADD |---+
|DT[5]| |hmeter |
|31 | |2.7778e-4|
|lasts| |hmeter |
Hi all ,
Good day to everyone.
Can any one suggest how to program for hour meter In Rockwell L72 processors.
I’m using power flux 527 in panel
. I need to know how many hours this drive Run .
These drives have built-in metering (in 10 hour increments) as a readable parameter by explicit messaging.
Hi,
Attached the simplest way I program an hour meter. The problem arises (as Ken pointed out) when you download a new program the values are overwritten. I still don't know how to solve this issue. What I usually do is to modify the program online. But if I have to download a new program, I copy the current values, then I download the program and finally I modify the downloaded values
Whatever you do, the "real" value will ALWAYS lag the value used from a timer that resets itself and makes some sort of incremental change in a counter...no matter the PLC. Timers do not go off at the "zero" time, they go off when the accumulated time exceeds the set point time. Better off to use a long-life timer and compare accumulated value to some fixed value(e.g. 6000 = 6 Sec. in AB world) and increment a 0.1 min interval from there. DO NOT reset timer until the thing is about to roll over. You're still guaranteed to lag "real time" but, at least you won't be adding to this error every 6 seconds.
Where critical accuracy is required I do 1 of 2 things, maybe a combination.
When the PLC is running I check the accuracy of the self-resetting 6 second timer and adjust it so a DN pulse is 6 seconds. That may be the preset is 5.985 or similar.
The second thing is to NOT reset the timer at 6 seconds, Do a compare GEQ T.ACC 6000 and OTE pulse and SUB T.ACC 6000 T.ACC.
This way the timer doesn't lose the DN and reset time loss. If the GEQ 6000 isn't accurate enough I change it to GEQ 5985 and SUB 5985.
But for most applications a self-resetting 6 second timer is good enough. The accuracy of the log would be within ±2% and that would be good for maintenance needs for PM.
the simplest way I program an hour meter.