LEESON SCR Thyristor Motor Control - Manual (Page 28)

22 Installation SPEEDMASTER™ OPERATION MANUAL
To mount the drive:
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
case. The right side of the cover is hinged to the case. Pull
the slotted screw to open the case.
3. Carefully remove the conduit knockouts by tapping them
into the case and twisting them off with pliers.
4. Install conduit hardware through the 0.88 inch (22 mm)
knockout 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 case.
6. Turn the slotted screw clockwise until tight to secure the
front cover.
7. Set the POWER switch to the OFF position before applying
the AC line voltage.
Heat sinking
Models 174307 and 174308 require an additional heat sink,
Leeson part number 174316, when the continuous armature
current is above 5 ADC. Use a thermally conductive heat sink
compound between the back of the drive case and heat sink
surface for optimum heat transfer.
All other cased drives do not require additional heat sinking to
operate up their rated output current.