20
TXP Inst. & Maint. Manual: IM-825
2.7.6 Hazards due to resonances
and vibrations
WARNING!
Risk of injury due to com-
ponent failure
Operation with resonances
and vibrations can damage
the fan and cause the impel-
ler to break. Fragments are
thrown out of the fan and can
injure bystanders.
When commissioning,
measure the vibrations
Do not operate the fan
in resonance mode
Follow the instructions
for transport, storage
and installation de-
scribed in the instruc-
tions
Prevent impacts on the
fan
Skip or block areas
with increased vibra-
tion values
We recommend the
use of permanent vi-
bration monitoring for
speed-controlled fans
Risk from Vibrations
Typical damage to fans is caused by im-
permissible vibrations. If the fan is oper-
ated with impermissible vibrations for a
long time, this will affect the service life
of the entire product. Vibrations can
loosen screw connections and damage
ball bearings. In the worst case, parts
break and are thrown out of the vent. If
people are hit by these parts, this can
lead to serious injuries or death.
Risk from Resonances
Every component on the fan has its own
natural frequencies. These can be ex-
cited by certain speeds of the fan, which
leads to a possible resonance opera-
tion.
The resonance operation can lead to
mechanical destruction of the fan and
the associated personal injury. There is
danger to life. The fan must not be oper-
ated in resonance mode. The fans are
designated in such a way that reso-
nances usually do not occur.
If the speed changes during operation,
an excitation can occur in under certain
circumstances. These circumstances
are also influenced by the customer-
specific installation situation or the venti-
lation connection.
If operating frequencies of the fan lead
to resonance operation, these must be
excluded by appropriate parameteriza-
tion of the frequency converter.
The fan should be installed and commis-
sioned by specialists with experience in
handling fans. Adhere to the information
in the operating instructions to prevent
damage.
2.7.7 Hazards when operating
multiple fans
If the fan is operated in combination with
other fans in a system, additional resid-
ual hazards are created. Therefore,
when working on systems with multiple
fans, always switch off all fans that can
cause a hazardous situation.
The following situations may occur when
working in multi-ventilator systems:
•
The impeller of the fan does not
stand still despite the separation of
