Delta BLD-E1 brushless DC motor drive BLD-E1 Series - Manual (Page 24)

Chapter 2 Installation and Wiring| BLD-E1 Series
Revision May 2009, 00DE, V0.50 2-5
6. With long motor cables between the brushless DC motor drive and motor, high capacitive
switching current peaks can cause over-current, high leakage current or lower current readout
accuracy. To prevent this, the motor cable should be less than 20m for 3.7kW models and
below. And the cable should be less than 50m for 5.5kW models and above. For longer motor
cables use an AC output reactor.
7. The brushless DC motor drive, electric welding machine and the greater horsepower motor
should be grounded separately.
8. Use ground leads that comply with local regulations.
9. No brake resistor is built in the BLD-E1 series, it can install brake resistor for those occasions
that use higher load inertia or frequent start/stop. Refer to Appendix B for details.
10. To prevent the lightening strike and electric shock, the metal grounding wire of electric
equipment should be thick, short and connect to the specific ground terminal of the variable
frequency system.
11. Multiple BLD-E1 units can be installed in one location. All the units should be grounded directly
to a common ground terminal, as shown in the figure below. Ensure there are no ground
loops.
Excellent
Good
Not allowed