3. If it runs perfectly, connect a load.
NOTICE
Thermal overload of motors connected directly to the line supply
In addition to the load torque, the ramp-up (accelerating) time is essentially inuenced by
the moment of inertia to be accelerated. While ramping up when connected to the line
supply, the inrush (starting) current is a multiple of the rated current. This can result in
thermal overload. This can damage the motor.
As a consequence, when ramping up, observe the following:
• Monitor the ramp-up time and number of consecutive starts.
• Comply with the limit values and/or ramp-up conditions specied in the catalog or the
order documentation.
4. During the test run, check and document the following:
– Check whether it is running smoothly.
– Document the voltage, current and power values. As far as possible, document the
corresponding values of the driven machine.
– If this is possible using the available measuring equipment, check the bearing and stator
winding temperatures until they have reached steady-state values.
– Check mechanical operation for noise or vibration at the bearings or end shields.
5. In case of uneven running or abnormal noise, switch o the machine. As the machine runs
down, identify the cause.
– If the mechanical operation improves immediately after the machine is switched o, then
the cause is magnetic or electrical.
– If the mechanical running does not improve immediately after switching the machine
o, then the cause is mechanical.
- Imbalance of the electrical machine or the driven machine
- The machine set has not been adequately aligned
- The machine is being operated at the system resonance point. System = motor, base
frame, foundation, ...
NOTICE
Destruction of the machine
If the vibration values in operation are not maintained in accordance with ISO 10816-3,
then the machine can be mechanically destroyed.
• In operation, maintain vibration values in accordance with ISO10816‑3.
Commissioning
7.3Switching on
1MB..1/2/3/4 - shaft heights 63 ... 355
Operating Instructions, 11/2023, A5E52779900A 101
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