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Energy costs are significant in press shops. Here's how to achieve 20-30% additional reduction beyond the inherent servo press advantage.
## 1. Enable Energy Regeneration
Ensure the regenerative unit is enabled and properly sized. A 400-ton servo press can regenerate **15-25 kWh per shift**. Verify regenerated energy feeds back to the plant grid, not just dissipated in braking resistors.
## 2. Optimize Motion Profile
Reduce maximum slide velocity in non-working zones — going from 400 mm/s to 300 mm/s reduces peak power demand by 44% (power scales with velocity squared). Use pendulum motion for progressive dies.
## 3. Reduce Idle Power
Implement automatic sleep mode after 5 minutes of inactivity — reduces servo drive power to minimum holding current. A servo press in standby still consumes 5-15 kW.
## 4. Power Factor Correction
Servo drives have poor power factor (0.7-0.85) without correction. Install active front-end (AFE) drives. Improving power factor from 0.8 to 0.95 reduces apparent power demand by 16%.
## 5. Schedule Production Intelligently
Run high-tonnage jobs during off-peak electricity rate periods. A cold press startup consumes 3-5× more energy than steady-state for the first 15 minutes.
## 6. Monitor and Measure
Track **kWh per 1000 parts** as your KPI. Unexplained increases often indicate mechanical problems before they cause failures.
## Expected Results
At $0.12/kWh and 6000 operating hours/year, a 400-ton press saving 20 kW average = **$14,400/year savings**.