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Bearing Commissioning

Run-in and Commissioning Procedures for AXRY-NGS Bearings

Commissioning Procedure Overview

AXRY-NGS (NGS-SBI) bearing commissioning consists of two main phases that must be completed in sequence:

1

Grease Distribution Cycle

Ensures even grease distribution within the bearing, preparing for high-speed operation. Uses CW/CCW/Stop alternating pattern.

2

Limiting Speed Cycle

Ten-step progressive acceleration program to safely reach bearing limiting speed.

Important Notice

Proper commissioning is critical for achieving optimal bearing performance. The grease distribution cycle must be completed before proceeding to the limiting speed cycle.

1 Grease Distribution Cycle

The grease distribution cycle for AXRY-NGS (NGS-SBI) bearings is substantially longer than for standard NGX/EX bearings and is adapted depending on:

  • Lubrication system - Grease lubrication or oil-air lubrication
  • Lubricant type - Different greases have different distribution characteristics
  • Target limiting speed - Higher speeds require longer distribution time

Grease Distribution Procedure

The grease distribution cycle consists of 15 stages, each 10 minutes, using CW (Clockwise) / CCW (Counter-Clockwise) / Stop alternating rotation pattern:

Grease Distribution Cycle Diagram
Grease Distribution Cycle Diagram - CW/CCW/Stop Alternating Pattern
CW - Clockwise
CCW - Counter-Clockwise
Stop - Stationary
Stage Speed Duration Speed Range
1 0.1 x nG 10 min 10-50% nG
2 0.2 x nG 10 min
3 0.3 x nG 10 min
4 0.4 x nG 10 min
5 0.5 x nG 10 min
6 0.55 x nG 10 min 55-75% nG
7 0.6 x nG 10 min
8 0.65 x nG 10 min
9 0.7 x nG 10 min
10 0.75 x nG 10 min
11 0.8 x nG 10 min 80-100% nG
12 0.85 x nG 10 min
13 0.9 x nG 10 min
14 0.95 x nG 10 min
15 1.0 x nG (nG) 10 min

nG = Limiting speed; Total time approx. 150 minutes (2.5 hours)

Purpose of Grease Distribution

  • Evenly distribute grease to raceway and rolling element contact surfaces
  • Expel excess grease to bearing edge areas
  • Establish stable lubricating film
  • Reduce initial friction torque to stable value

2 Limiting Speed Cycle

After completing grease distribution, proceed to the ten-step progressive acceleration program. Each stage lasts at least 60 minutes:

Stage Speed (% of nG) Minimum Duration
1 0.1 x nG (10%) >= 60 min
2 0.2 x nG (20%) >= 60 min
3 0.3 x nG (30%) >= 60 min
4 0.4 x nG (40%) >= 60 min
5 0.5 x nG (50%) >= 60 min
6 0.6 x nG (60%) >= 60 min
7 0.7 x nG (70%) >= 60 min
8 0.8 x nG (80%) >= 60 min
9 0.9 x nG (90%) >= 60 min
10 1.0 x nG (100%) >= 60 min

nG = Limiting speed; Total time at least 600 minutes (10 hours)

Limiting Speed Cycle Characteristics

  • Each stage minimum 60 minutes (longer than grease distribution cycle)
  • No specific rotation direction specified
  • Cooling breaks between stages
  • Purpose is to ensure bearing can operate stably at limiting speed

Temperature Monitoring Requirements

Temperature monitoring is critical for both commissioning phases:

Maximum Temperature Limit

60 deg C

Sensor temperature in sensor bore must not exceed this value

Cooling Target Temperature

21 deg C +/- 1K

Cool to this temperature at beginning and between each stage

Temperature Control Key Points

  • Use temperature sensor in bearing sensor bore for continuous monitoring
  • Include cooling breaks between each stage
  • Starting temperature should be reduced to 21 deg C +/- 1K
  • If temperature exceeds 60 deg C, immediately reduce speed and extend cooling time

Post-Commissioning Verification

After completing both commissioning phases, relevant data should be recorded for tracking and analysis.

Data to Record

  • Grease distribution cycle duration and temperature curve
  • Temperature curve for each limiting speed cycle stage
  • Duration of each stage
  • Any anomalies observed
  • Temperature and friction torque at final stable operation

Technical Support

For technical questions or troubleshooting, please contact myonic application engineering at MTC-Engineering@myonic.com

Over-Lubrication Recovery

If the bearing is over-lubricated, repeat the commissioning procedure to restore original friction torque:

  1. Stop operation and allow bearing to cool to room temperature
  2. Restart from the grease distribution cycle (15-stage CW/CCW/Stop program)
  3. After completing grease distribution, start from limiting speed cycle stage 1 (10% nG)
  4. Strictly follow the ten-step program
  5. Monitor temperature until stable within normal range

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