www.nord.com B1091-GB-3212 -5-
3. Information
3.2 Installation
Screwed-in lifting eyes must either be screwed in fully or removed after erection!
Running smoothness: Precise alignment of the coupling and a well-balanced drive
element (coupling, belt pulleys, fans, etc.) are prerequisites for quiet, low vibration
operation.
Complete balancing of the motor with the drive elements may be necessary.
The upper section of the terminal box and the terminal box position can be rotated by
4 x 90 degrees.
IEC-B14 motors:
All four fixing screws, even if not required, must be screwed into the flanged bearing
plate! The fixing screw threads must be inserted with a sealant, e.g. Loctite 242. The
maximum screw-in depth in the bearing plate is 2 x d.
The motor must be inspected for damage before installation and commissioning. A
damaged motor must not be commissioned.
3.3 Balancing, output components
Fitting and removing output assemblies (coupling, pulleys, gear, ...) must be performed
with a suitable device. The rotors are balanced with half key balancing as standard.
When fitting output assemblies to the motor shaft observe the appropriate type of
balancing! The output assemblies have to be balanced in accordance with
DIN ISO 1940!
Take the general precautions necessary for providing the output assemblies with shock
protection. If a motor is put into operation without an output assembly, prevent the key from
being flung out. This also applies if a second shaft end is fitted. Alternatively, remove the key.
3.4 Alignment
Especially if there is a direct coupling, align the shafts of the motor and the driven machine
with one another axially and radially. Any inaccurate alignment can lead to bearing damage,
excessive vibrations and shaft breakage.
3.5 Electrical connection
Feed the connecting leads into the terminal box with cable glands. The terminal box must be
sealed so that it is dust-tight and water-tight. The mains voltage and mains frequency must
agree with the figures on the name plate. ± 5% voltage deviations or ± 2% frequency
deviations are permissible without any reduction in performance. The connections and
arrangement of the terminal board jumpers must conform to the circuit diagram provided in
the terminal box. Connect the protective earth lead to that protective earth terminal.
Provide the ends of the connecting leads with cable lugs or curved ring eyes and connect
them to the terminal board. That also applies to the protective earth connection and the
external bonding lead.
For tightening torques at the screw connections of electric terminals and the terminal board
connections (apart from terminal strips) refer to the table below:
Tightening torques for terminal board connections
Thread diameter M4 M5 M6 M8
Tightening torque (Nm) 0.6 – 1.2 1.8 – 2.5 2.7 – 4.0 5.5 – 8.0
If the machine has an auxiliary heater, it must not be switched on during operation.
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