Current Signature Trend 12C
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1 Current Signature Trend 12C DB 20 log (Amps60/AmpsSb) < 51DB Alert 2004, 2010 and 2013 Data points (identified With green dot) have poor/suspect frequency match between frequency of highest sideband and predicted rotor fault frequency (Fpp=pole pass frequency). See next 6 slides. I selected highest sideband (which gives higher peak, lower db.. conservative). If we used predicted rotor fault frequency the db would be higher (2013 would be 60+). Both 2016 readings have good agreement and 4/16 measurement frequency was also confirmed by vib/speed measurement and by observation of meter swinging. < 45DB Alarm
2 12C 10/13/ db or higher 31A. 5cpm error. Estimated Freq Test Date Freq (cpm) From spectrum Magnitude CT sec From spectrum 10/13/ DB = 20 LOG10 (Main / Sideband) ======check position vs posn est. from AMPs======== Magnitude CT pri 31.1 Use 30/1 CT ratio per 9EPKAA-01 (Fraction) 35% Estimated Slip 10.6 NP Slip x Est Load (Fraction) Estimated Fpp 21.2 Estimated Slip x poles (2) Estimated U Est Fpp Estimated L Est Fpp
3 12C 7/17/ db 33.5A 3cpm error. Estimated Freq Test Date Freq (cpm) From spectrum Magnitude CT sec From spectrum 07/17/ DB = 20 LOG10 (Main / Sideband) ======check position vs posn est. from AMPs======== Magnitude CT pri 33.5 Use 30/1 CT ratio per 9EPKAA-01 (Fraction) 41% Estimated Slip 12.2 NP Slip x Est Load (Fraction) Estimated Fpp 24.4 Estimated Slip x poles (2) Estimated U Est Fpp Estimated L Est Fpp
4 12C 7/15/ db or higher. 32.5A 5cpm error. Estimated Freq Test Date Freq (cpm) From spectrum Magnitude CT sec From spectrum 07/15/ DB = 20 LOG10 (Main / Sideband) ======check position vs posn est. from AMPs======== Magnitude CT pri 32.5 Use 30/1 CT ratio per 9EPKAA-01 (Fraction) 38% Estimated Slip 11.5 NP Slip x Est Load (Fraction) Estimated Fpp 23.0 Estimated Slip x poles (2) Estimated U Est Fpp Estimated L Est Fpp
5 12C 7/11/ db down 28A. 7 cpm error. Test Date 07/11/13 Freq (cpm) From spectrum Magnitude CT sec From spectrum 47.9 DB = 20 LOG10 (Main / Sideband) Est Freq ======check position vs posn est. from AMPs======== Magnitude CT pri 28.0 Use 30/1 CT ratio per 9EPKAA-01 (Fraction) 28% Estimated Slip 8.4 NP Slip x Est Load (Fraction) Estimated Fpp 16.7 Estimated Slip x poles (2) Estimated U Est Fpp Estimated L Est Fpp
6 12C 1/20/ db 25A 8 cpm error Est Freq Test Date Freq (cpm) From spectrum Magnitude CT sec From spectrum 01/20/ DB = 20 LOG10 (Main / Sideband) ======check position vs posn est. from AMPs======== Magnitude CT pri 24.7 Use 30/1 CT ratio per 9EPKAA-01 (Fraction) 18% Estimated Slip 5.4 NP Slip x Est Load (Fraction) Estimated Fpp 10.8 Estimated Slip x poles (2) Estimated U Est Fpp Estimated L Est Fpp
7 12C 4/6/ db. Confirmed freq by vib measurement Freq Est from current Test Date Freq (cpm) From spectrum Magnitude CT sec From spectrum 04/06/ DB = 20 LOG10 (Main / Sideband ======check position vs posn est. from AMPs======== Magnitude CT pri 27.4 Use 30/1 CT ratio per 9EPKAA-01 (Fraction) 26% Estimated Slip 7.9 NP Slip x Est Load (Fraction) Estimated Fpp 15.8 Estimated Slip x poles (2) Estimated U Est Fpp Estimated L Est Fpp Freq Est From vib speed 4/6/16 Current meter Also oscillating with 4 second period when viewed one day later 4/7/16
8 Test Date Sister: 12A (sister). 66db. 4cpm error. Freq (cpm) From spectrum Magnitude CT sec From spectrum 07/25/ DB = 20 LOG10 (Main / Sideband) Freq Est from current ======check position vs posn est. from AMPs======== Magnitude CT pri 30.9 Use 30/1 CT ratio per 9EPKAA-01 (Fraction) 35% Estimated Slip 10.5 NP Slip x Est Load (Fraction) Estimated Fpp 20.9 Estimated Slip x poles (2) Estimated U Est Fpp Estimated L Est Fpp
9 Test Date Sister: 12B 12B 57db. 0cpm error Freq (cpm) From spectrum Magnitude CT sec From spectrum 12/16/ DB = 20 LOG10 (Main / Sideband) Estimated Freq ======check position vs posn est. from AMPs======== Magnitude CT pri 28.4 Use 30/1 CT ratio per 9EPKAA-01 (Fraction) 29% Estimated Slip 8.6 NP Slip x Est Load (Fraction) Estimated Fpp 17.3 Estimated Slip x poles (2) Estimated U Est Fpp Estimated L Est Fpp
10 Sister 22A 60db 3cpm error Estimated Freq Test Date Freq (cpm) From spectrum Magnitude CT sec From spectrum 02/11/ DB = 20 LOG10 (Main / Sideband) ======check position vs posn est. from AMPs======== Magnitude CT pri 27.3 Use 30/1 CT ratio per 9EPKAA-01 (Fraction) 26% Estimated Slip 7.8 NP Slip x Est Load (Fraction) Estimated Fpp 15.6 Estimated Slip x poles (2) Estimated U Est Fpp Estimated L Est Fpp
11 Sister 22B 62db. 8cpm error Estimated Freq Test Date Freq (cpm) From spectrum Magnitude CT sec From spectrum 12/31/ DB = 20 LOG10 (Main / Sideband) ======check position vs posn est. from AMPs======== Magnitude CT pri 32.5 Use 30/1 CT ratio per 9EPKAA-01 (Fraction) 38% Estimated Slip 11.5 NP Slip x Est Load (Fraction) Estimated Fpp 23.0 Estimated Slip x poles (2) Estimated U Est Fpp Estimated L Est Fpp 2015 bad data 2012 load too low to distinguish pole Pass sidebands 4/18/16 No current Oscillation on mete (suggests healthy)
12 22C. 60db. 3cpm difference Estimated Freq Test Date Freq (cpm) From spectrum Magnitude CT sec From spectrum 08/12/ DB = 20 LOG10 (Main / Sideband) ======check position vs posn est. from AMPs======== Magnitude CT pri 35.7 Use 30/1 CT ratio per 9EPKAA-01 (Fraction) 45% Estimated Slip 13.6 NP Slip x Est Load (Fraction) Estimated Fpp 27.1 Estimated Slip x poles (2) Estimated U Est Fpp Estimated L Est Fpp
13 Vibration Overalls - steady Date Loc: 1A 1H 1V 2H 2V 3H 3V 4A 4H 4V Units: ips ips ips ips ips ips ips ips ips ips Alert: Alarm: /28/ /18/ /8/ /19/ /26/ /1/ /24/ /7/ /25/ /8/ /22/ /26/ /11/ /3/ /12/ /8/ /18/ /27/ /15/ /25/ /16/ /22/ /19/ /15/ /27/
14 1V vibration pole pass sidebands around 1x and 2x. 5-10% of main peak <=1X-Fp <=1X+Fp <=1X <=compressor running speed <=2X-Fp (7170) <=2x (7186) 2LF Typical broadband flow-related noise for these machines
15 <=1X <=compressor running speed <=2X (7186.5) <=2X-Fp (7171) 1H pole pass sidebands around 1x and 2x. Typical broadband flow-related noise for these machines
16 (Fraction) vs Amps and vs speed Est. Load vs Current Est. Load vs Speed Amps Speed Data Sheet Fit NLA = 22 FLA = 66 Data Sheet: From data sheet Fit: Load = sqrt(amps^2-22^2) / sqrt(66^2-22^2)
17 12C Estimates of load based on speed (from vib) and current (from panel meter). Agreement is not great. If actual severe rotor problem, expect both would increase for a given load (actual load not known for specific time, but presumably average load does not change over time) Est Load C - Load Estimates by Panel Amps and By Speed (from vibration) 3576rpm 54.4A rpm 48.8A rpm 43.3A rpm 38.1A rpm 33.2A rpm 28.9A rpm 25.3A rpm 22.9A rpm 3600rpm 5/28/ /10/2006 2/22/2008 7/6/ /18/2010 4/1/2012 8/14/ /27/2014 5/10/2016 9/22/2017 Load Est By Panel Amps Load Est By Speed 3600rpm 3600rpm 22A
18 Rotor photo (sister motors). Cast rotor construction, confirmed by OEM. Different failure mechanisms than fab rotor, and more difficult to repair 22B 22A
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