When the motor opposes the direction of rotation as in deceleration or vertical axis escalation, part of the regenerative energy will be delivered back to the driver. This energy will first be stored in internal capacitors of the driver. When the energy stored in the capacitors reach the maximum capacity, a regenerative resistor is required to dissipate the excessive energy and prevent over-voltage.
| Model | Internal resistance (ohm) | Internal resistor power rating (W) | Minimum resistance (ohm) | Minimum power rating (W) |
| NL7-EC400F | 100 | 50 | 50 | 50 |
| NL7-EC750F | 50 | 75 | 40 | 50 |
| NL7-EC1000F | 50 | 100 | 30 | 100 |
| NL7-EC750FT | 100 | 100 | 100 | 100 |
| NL7-EC1000FT | 100 | 100 | 100 | 100 |
| NL7-EC1500FT | 100 | 100 | 100 | 100 |
| NL7-EC2000FT | 50 | 100 | 40 | 100 |
| NL7-EC3000FT | 50 | 100 | 40 | 100 |
| NL7-EC4400FT | 35 | 100 | 35 | 100 |
| NL7-EC5500FT | 35 | 100 | 25 | 100 |
| NL7-EC7500FT | 35 | 100 | 25 | 100 |