RDD-Series Rotary Direct Drive Bearingless Motor Installation Instructions
15
Publication RDB-IN002A-EN-P — October 2009
Tighten the Compression Coupling
Follow these steps to secure the motor on the machine shaft.
1.
Access the compression coupling bolts through the holes labeled A.
• The RDB-
x
290
x
motor has six (6) bolts to tighten.
• The RDB-
x
410
x
motor has ten (10) bolts to tighten.
2.
Moving in a circular pattern, use a 6 mm hex bit to tighten each compression
coupling bolt to the torque value shown in the table, and repeat as listed in
the table.
Torque Value
Number of Repetitions
Hand-tighten - 0.1 N•m (1 lb•in.)
1x
13 N•m (10 lb•ft)
2x
20 N•m (15 lb•ft)
2x
30 N•m (22 lb•ft)
2x
30 N•m (22 lb•ft)
Until no bolt moves.
IMPORTANT
The torque sequence requires at least eight steps to secure the compression
coupling on the machine shaft. Each step gradually increases the torque value,
until the final value is attained. Several steps are performed a more than once
to verify the torque force is applied evenly to all bolts as they seat.
Tightening the compression coupling in this manner balances the forces applied
by the compression coupling to the machine shaft. This result in a secure
connection with evenly distributed forces that can be more easily released at a
later time.
B
B
B
B
C
C
C
C
B
B
B
B
C
C
C
C
A
A
A
A
A
A
A
A
A
A
D
D
RDB-x410x with Rear Cover Removed
(RDB-x4103 is shown)
RDB-x290x with
Rear Cover Removed
