We are having an issue with our Enpac 1200 data collectors. During some data collection activities, we are seeing identical (16 decimal places in the database) overall vibration amplitudes from different monitoring positions on the same component (pump, motor, gearbox). The collection specification uses a Fmax of 60000 cpm and a 318 cpm (5.3 Hz) HP filter The 318 cpm HP filter is a hardware (data collector) filter. The overall measurement is analog, from the HP filter to the upper limit of the data collector (40 kHz).

More than half of our documented occurrences share the same data collector, but we have evidence of the problem with at least 4 different data collectors. This appears to be occurring at low amplitudes (less than 0.05 ips pk). Could this be related to the A/D converter? The last time we spoke with the vendor, they indicated that this has never been reported before. Have your ever seen this? Can you review/scan your data to see if you have the same issue?

Hi Steve, I have a 1200A and been using it for over a year. No - no such problems that I've been aware of - I did a quick scan on my amplitude measurement and I have some 6 deci place measurements but nothing approaching your 16.
What are Rockwell going to do about it?
Are you on Esafe?
Regardless of that they should be figuring out a solution or else providing you new software/hardware to fix.
Don't settle for "we don't know".

A thought - are you running on a single user license - if so the one computer.
Could the computer be worth checking?

Mike.

What sensor do you use and that your settning time? I have seen this problem and workt around it

Mike,

Thanks for the input. We do have Esafe and are still pursing the problem with Entek (Rockwell). One of their suggestions was to upgrade our software and hot-fixes, which we are in the process (slow & painful) of doing.

We have a MS Access guru in our group who is able to query the raw data (16 decimal points).

Do you know what firmware and hardware revision your Enpac has? We are on firmware rev 2.31 and hardware rev "T".

Monitor Man - We use entek 9000A and 9100 accelerometers. In the enpac, we have the Autoranging setting as Conservative and the Machine Speed setting as Normal.

Thanks again for the input.

Firmware revision 2.30.
Not sure about hardware rev - where do you find this?
Use a 943 Accel. Auto ranging aggressive and machine speed normal.

Mike.

On our enpacs, the hardware revision is shown on a sticker on the back of the collector (below the battery access door). Is the 943 a Wilcoxon accelerometer?

Steve

Thanks Steve - and so obvious
Mines a T .
The 943 were IRD accelerometers - very nice and light and small.
You can get them through Rockwell.
I have a couple of magnetic rails that I use.

Try Wilcox 787A and try Settling Delay for 6sec
and in software 0,36hz low freq cut NOT 0 Hz
A/D converter can not handle messurements under 0,36hz in Vibrations...

and you can change to lager letters/numbers
Push +244

Have a nice day

quote:

Originally posted by Monitor man:
Try Wilcox 787A and try Settling Delay for 6sec
and in software 0,36hz low freq cut NOT 0 Hz
A/D converter can not handle messurements under 0,36hz in Vibrations...
So in you case 0.4hz in low cut freq Settling Delay 3sec or more

Here what I found out about you sensor

9000A SensorGeneral PurposeDYNAMICSensitivity, ±5%, 25°C ______________________________100 mV/gAcceleration Range1_________________________________50 g peakAmplitude Nonlinearity ______________________________1%Frequency Response±5%__________________________________________1.2 - 5,000 Hz±10% ________________________________________0.9 - 8,000 Hz±3 dB ________________________________________0.4 - 10,000 HzResonance Frequency

And you can change to larger letters/numbers
Push +244

Have a nice day

quote:

Originally posted by Monitor man:
Try Wilcox 787A and try Settling Delay for 6sec
and in software 0,36hz low freq cut NOT 0 Hz
A/D converter can not handle messurements under 0,36hz in Vibrations...

and you can change to lager letters/numbers
Push +244

Have a nice day

We typically use the 318 cpm (5.3 Hz) HP filter. On some slower machines, we use the 21.6 cpm (0.36 Hz) HP filter. How do you configure the Settling Delay for 6 seconds?

I'm going to try out the +244 and lookup the specification sheet on the Wilcox 787A.

Thanks,
Steve

In config you should have that option

The configuration setting on our Enpacs are somewhat different than yours, we don't have settling time as an option. Here's a sample from the Version 2.30 release notes. What Version/Firmware do you have?

Also, the +244 isn't doing anything. I would really like to find a solution that doesn't involve using a different accelerometer.

Thanks,
Steve

Configuration_Sample.doc (26 Kb, 13 downloads)

Steve,

I have the 2500. Right between your machinery speed and memory options I have the ability to set the settling time.
I have firmware version 1.01, which I hope to upgrade soon. It was compiled in July, '05.

Perhaps you need to do what Bill Gates advises, reload the firmware and reboot

Dave

Dave,

Sorry, no dice! I reloaded the v2.3 firmware and still don't have the option to configure settling time. Sounds like I'll be talking with Rockwell tomorrow.

Thanks,
Steve

quote:

Originally posted by Monitor man:
In config you should have that option

Monitor Man - What firmware version do you have?

Thanks,
Steve