Motor On Inlet Side of Blower (Top Shaft)
Motor On Inlet Side of Blower (Bottom Shaft)
Motor On Discharge Side of Blower (Top Shaft)
Motor On Discharge Side of Blower (Bottom Shaft)
INLET
DISCHARGE
Top Shaft
INLET
DISCHARGE
Bottom Shaft
Motor On Drive Shaft
Side of Blower
INLET
DISCHARGE
Driven Shaft
Drive Shaft
INLET
DISCHARGE
Top Shaft
INLET
DISCHARGE
Bottom Shaft
Motor On Driven Shaft
Side of Blower
INLET
DISCHARGE
Drive Shaft
Driven Shaft
UNIVERSAL RAI
®
, URAI-DSL, URAI-G and Metric Series
|
13
Figure 2 - Allowable Overhung Loads for VX-Belt Drives Universal RAI
®
/URAI-J
™
Units
Acceptable Blower Drive Arrangement Options
Belt Pull in lbs =
252100 • Motor BHP
Blower RPM• Sheave Diameter in inches
Shaft load (lb.in) = Belt Pull (lbs) • (A" +
¼
"
+
)
Sheave Width (")
2
NOTE:
Arc of sheave belt contact on the smaller sheave not to be less than 170°
Driver to be installed on the inlet side for vertical units, and on the drive shaft side
for horizontal units.
ROOTS recommends the use of two or more 3V, 5V or 8V belts and sheaves.
Above are suggested locations for available accessories.
Acceptable
Unacceptable
Frame
Size
Dim
“A”
Max. Allow.
Shaft Load
(lb.in)
Min
Sheave
Diameter
Max.
Sheave
Width
22, 24
0.61
150
4.00
4
32, 33, 36
0.80
400
5.00
5
42, 45, 47
1.02
730
5.00
5
53, 56, 59
1.13
1,325
6.00
6
65, 68, 615
1.36
2,250
8.00
8
76, 711, 718
1.16
3000
9.50
9.5
