8.4 Switching on the machine
1. If at all possible, run the machine without load and check that it is running smoothly.
2. 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 influenced 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 specified in the catalog or the
order documentation.
3. If this is possible using the available measuring equipment, check the bearing and stator
winding temperatures.
8.5 Regreasing roller bearings
Refer to the regreasing instructions for the roller bearings on the lubricant plate.
8.6 Switch off the external fan
Do not immediately switch off the separately-driven (external) fan after switching off the
machine. First wait for the machine to cool down. This will prevent the accumulation of residual
heat.
8.7 Switching on again after an emergency switching-off
● Check the machine before recommissioning the driven machine after an Emergency Off.
● Eliminate all the causes that have led to the emergency off
8.8 Stoppages
The stoppage is a shutdown for a period of time, during which the machine is stopped but
remains at the location of use.
Under normal ambient conditions, e. g. the stopped machine is not exposed to any vibration,
no increased level of corrosion, etc. in general, the following measures are necessary during
stoppages.
Operation
8.4 Switching on the machine
SIMOTICS TN Series N-compact 1PQ8
100 Operating Instructions 11/2018
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