Rockwell Automation T6050 SurgeGard Incipient Surge-Conditioning Module - Manual (Page 41)

T6050 Operations & Maintenance Guide Chapter 4 – Operations
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and confirm the surge line by experimental field testing.
For the field tests of incipient surge and surge spike, the raw transmitter signal is monitored and
recorded on a high-speed oscillographic recorder or T6050 SG-1:A2 wave-form analyzer. To
calibrate the surge limit line, one or several surge tests have to be carried out. For variable speed
compressors (turbine driven units) the surge test should, in addition to the 100 percent RPM, be taken
at several speed settings in order to establish a reasonably complete surge line. The T6200 and
T6300 controllers will automatically store the test points. The points are then linearly interpolated
by a look-up table function to generate a precise surge control line.
Figure 7. Typical Inlet ACFM vs Polytropic Head Ft-lb/lb Graph
Surge Test Wave-form Analyzer
To accurately verify the compressor’s incipient surge oscillation signature, it is recommended to use
a waveform analyzer. There are several packages available. ICS Triplex offers the T6050 SG-1:A2
low cost wave-form analyzer starter kit, (model DI-194RS from DATAQ), which records data with
10-bits accuracy at rates of 240 samples/second. The module has four ±10V analog inputs, two
digital inputs for remote start/stop and remote event marker control and a convenient serial data port
interface to your PC. The included software is Windows 95, 98, NT, ME, 2000, and XP compatible.
Refer to www.dataq.com . The wave-form analyzer speed of 240 samples/sec is adequate for large
process compressors. For rapid oscillation signature analysis applications (small compressors) it is
recommended to use a high-speed waveform monitor.