LEESON SCR Thyristor Motor Control - Manual (Page 27)

21 Installation SPEEDMASTER™ OPERATION MANUAL
Mounting (NEMA 4 and NEMA 4/12 enclosures)
NEMA 4/12 cased drives (models 174100 and 174105) come
with two 0.88 inch (22 mm) conduit knockout holes at the bottom
of the case. Model 174709, a NEMA 4 cased drive, comes with
three knockout holes at the bottom of the case. All NEMA 4 and
NEMA 4/12 drives may be vertically wall mounted using the four
0.19 inch (5 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.
6.00 [152]
2.50 [64]
CL
2.50 [64]
1.79 [45.0]
5.00 [127]
8.00 [203]
Figure 11. NEMA 1 Mounting Hole Locations