5.3 VRE-R belt-driven fans
5.3.1 Replacing the belt
Worn belts must urgently be replaced by belts of the same type (as specified in Fan Identity Card). It is advisable to
purchase spare belts from the MIETZSCH company. For replacing belts proceed as follows:
Belt drive with motor sliding plate
Demount belt guard
loosen motor sliding plate
Apply new belt
Tension belt by shifting motor sliding plate
Fasten motor sliding plate
Check belt tension
Fasten belt guard
Belt drive with belt tensioner
Demount belt guard.
Loosen belt tensioner
Loosen fastening screw of tension device
Apply new belt.
Tension belt by turning the fastening screw
Fasten belt tensioner with base frame
counter fastening screw
Check belt tension
Fasten belt guard
Check and, if needed, correct belt tension after running time of 30 to 60 minutes with full load.
Changes of the belt drive, such as variation of transmission ratios, are permissible only after consultation with the
MIETZSCH company since consequential damages will otherwise not be covered by warranty.
5.3.2 Replacing the motor
Demounting
Loosen belt (Section 5.3.1)
Unscrew motor from base/sliding plate
Demount driving belt pulley
Mounting
Fasten motor on base/sliding plate.
Fasten driving belt pulley on motor shaft and align it exactly to driven pulley.
Apply belt (Section 5.3.1).
5.3.3 Replacing flange and block-type bearings
Loosen and apply belt (see Section 5.3.1)
Replace bearing analogously to motor changing explained in Section 5.2.
6
sliding plate
belt deflection t
e
check load F
p
tension pulley
belt deflection t
e
check load F
p
motor belt pulley
motor
tension pulley
tensioner
fastening screw of
tension device
tension lever with
counter nut
base
POLY-V - belt
OI-VRE 05/02
