Rockwell Automation 44887-PUB, 44887 Enwatch - Manual (Page 27)

Publication GMSI10-UM031C-EN-E - January 2009
Installing the Enwatch 23
gSE time constant 0.03, 0.006, 0.0012, 0.00024 seconds, the default is 0.03 seconds
if FMAX > 350Hz set to 0.00024 seconds
else if FMAX > 150 Hz set to 0.0012 seconds
else if FMAX > 37.5 Hz set to 0.006 seconds
If the measurement is overall only (no spectrum) then set to 0.03 seconds.
Integrator One level of hardware integration
The hardware has a gain factor of:
2.67/f for the 0.36 Hz and the 2.67 Hz filter ranges (INTHI = 0)
38.9/f for the 5.3 Hz and 23.7 Hz filter ranges (INTHI = 1)
To convert from g->ips:
Velocity (ips peak) = [integrator output (volts peak)] x [1 / (gain factor)] x [accel scale factor
(g peak / mv peak)] x [61.24 / frequency]
Sample sequence allowed 4096 - one sample sequence uses one configuration table
Configuration tables 128 - one measurement point uses one table so total will be 128 points
Storage overhead 18 bytes per allocation
Flash memory lifetime 100,000 writes
Total available memory 640 Kilobytes
HOST software support (Emonitor) Window types: Hanning, Hamming, Rectangular, Kaiser Bessel, Flattop
Number of lines 100, 200, 400, 800, 1600, 3200
Number of averages 1-99
Bias voltage reading When you define a process measurement of DC in Emonitor, the Enwatch unit reads the
transducer bias voltage.
24V means open circuit, 10V is OK.
Table 1.16 Enwatch measurement capabilities
Product Feature Capability