LEESON FHP Series NEMA 4x Variable Speed Drive - Manual (Page 19)

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If the drive continues to pick up noise after grounding the
shield, it may be necessary to add AC line filtering devices,
or to mount the drive in a less noisy environment.
Logic wires from other input devices, such as motion
controllers and PLL velocity controllers, must be separated
from power lines in the same manner as the logic I/O on
this drive.
Heat sinking
The
175326.00
drive is delivered with a heat sink chassis.
Ensure that there is adequate space above and below
the drive for proper convection air flow. A small fan
may be necessary for proper cooling in restricted space
applications.