Rockwell Automation DC3R Regenerative DC Drive User Guide 1/4 - 2 HP, 115/230 VAC - Manual (Page 18)

10 Installation
Mounting enclosed drives
NEMA 4X enclosed drives come with three 0.88 inch (22 mm) conduit
knockout holes at the bottom of the enclosure. The units may be vertically
wall mounted using the four 0.25 inch (6 mm) slotted holes on the attached
heat sink. For motor loads less than 5 ADC, the drive may be bench
mounted horizontally, or operated without mounting.
1. Install the mounting screws.
2. For access to the terminal strip, turn the slotted screw on the front cover
counterclockwise until it is free from the enclosure. The right side of the
cover is hinged to the enclosure. Lift or pull the slotted screw to open
the enclosure.
3. Carefully remove the conduit knockouts by tapping them into the
enclosure and twisting them off with pliers.
4. Install conduit hardware through the 0.88 inch (22 mm) conduit holes.
Connect external wiring to the terminal block.
5. Grasp the slotted screw and tilt the front cover back into place. Avoid
pinching any wires between the front cover and the enclosure.
6. Turn the slotted screw clockwise until tight to secure the front cover.
7. Set the POWER switch to the “0” or OFF position before applying the
AC line voltage.
Heat sinking
Chassis DC3R models require an additional heat sink when the continuous
armature current is above 7 ADC. Use Reliance® part number
DC3R-HS-00. All enclosed drives have sufficient heat sinking in their
basic configurations. Use a thermally conductive heat sink compound
(such as Dow Corning® 340 Heat Sink compound) between the drive
chassis and the heat sink surface for optimum heat transfer.