BIG ASS FANS Powerfoil 8 Plus, Installation Manual

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12’–24’ POWERFOIL ® 8, 12’–24’ POWERFOIL ® 8 PLUS
Electrical Installation (cont.)
Grounding
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Ass Fans. Due to high
frequency content on the output side of the fan controller, measures must be taken to ensure that all grounding connections conform to
the recommendations made in this section.
The fan controller’s safety ground (PE) must be connected to system ground. Ground impedance must conform to the
requirements of national and local industrial safety regulations and/or electrical codes. The integrity of all ground connections should be
periodically checked. All ground leads for downstream conduit boxes must be kept separate from the motor ground and terminated on
the fan controller’s PE terminal.
Motor ground
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building’s ground grid.
Shielded motor cable terminations
Either of the safety ground terminals on the drive provides a grounding point for the motor cable shield. The motor cable shield
connected to one of the drive terminals must also be connected to the motor frame. If no drain lead is present, the cable must be
stripped back so that the braid can be twisted and soldered to a pigtail for proper termination.