Troubleshooting/maintenance/repair |
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11.3.1 Variable-speed fans
Important
The fan may be destroyed due to unpermitted frequencies.
♦ Pay particular attention to damage from vibrations.
♦ After commissioning, start with shorter maintenance intervals.
♦ If no damage occurs, adjust the maintenance intervals up to the those stated in the operating
instructions.
♦ Responsibility for gradual adaptation is with the system operator.
11.3.2 Maintenance intervals
Conditions Maintenance intervals
monthly biannually annually
Fan unit in rare use (less than once a month) or in emergency operation
X X X
Fan unit in use under normal conditions
-
X X
Note:
The following sections contain suggestions from Systemair on the maintenance intervals.
♦ Shorten the intervals if the fan unit is used in a particularly dirty environment.
11.3.3 Monthly maintenance
Check (if present)
Measures
Operational readiness of the fan unit Allow the fan to run for 2 hours
Operational readiness of the emergency system Allow the "emergency" system to run for 15 minutes
Function of the “emergency” control Test whether the “emergency” control effectively bridges all
the other controls and switches
Function of the standstill heating Switch the motor off. The standstill heating must switch on
automatically and remain switched on
11.3.4 Half-yearly maintenance
Check (if present)
Measures
Condition of the ventilation system Remove all deposits, dirt and objects, which can influence
proper condition
Cooling ribs of the motor Remove all contaminations between the ribs of the motor
Fastening components (screws, nuts, cable glands,
etc.)
Check the fastening components (screws, nuts, cable glands,
etc.) and tighten them if necessary.
Blades Remove all dirt and dust deposits. Make sure that the blades
are tight. Replace any rotors which may be damaged
Condition of the safety devices and protective
devices
Clean the safety devices and protective devices
Replace them if there are indications of damage/rust
Condition of the standstill heating Remove the motor from the electric mains
Check whether the standstill heating is activated
11.3.5 Annual maintenance
Check (if present)
Measures
Air gap between the blades and the housing of the
fan
Make sure that the air gap between the blade and the
housing is correct. See chapter Air gap.
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