Greenheck Vektor-MH, Vektor-MD, and Vektor-MS (464652) - Manual (Page 13)

Vibration
On start-up and during operation, the unit should
operate smoothly with minimal vibration. It is possible
that a higher degree of vibration may be experienced.
Excessive vibration if left unchecked, can cause a
multitude of problems, including structural and/or
component failure.
The most common
sources of vibration
are listed.
Many of these
conditions can be
discovered by careful
observation. Refer to
the troubleshooting
section of this manual
for corrective actions. If observation cannot locate the
source of vibration, a qualified technician using vibration
analysis equipment should be consulted. If the problem
is wheel unbalance, in-place balancing can be done
through the access panel located on the side of each
fan’s tubular housing. Any correction weights added to
the wheel should be welded to either the wheel back
(single-plane balance) or to the wheel back and wheel
cone (two-plane balance).
1. Wheel Unbalance
2. Drive Pulley Misalignment
3. Incorrect Belt Tension
4. Bearing Misalignment
5. Mechanical Looseness
6. Faulty Belts
7. Drive Component Unbalance
8. Poor Inlet/Outlet Conditions
9. Foundation Stiffness
13 Laboratory Exhaust Systems
®