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System-specific ignition hazards
The criteria for the respective zonal classification are not harmonized and the assessment of
the operational risks, the local operating conditions and the various monitoring methods are
not standard. As a consequence, the remedial measures recommended by the supervisory
authorities may also differ depending on the authority's area of responsibility. The machine
manufacturer cannot provide general recommendations in this regard.
Note
Binding clarification of the local risks and of any required measures can only be provided by
the company operating the plant or system in agreement with the supervisory authority
responsible. The risk assessments from IEC / EN 60079-15 or -7 can be used to assess system-
specific ignition hazards.
If you using antifreeze in the cooling water, ensure that the coolant temperature does not fall
below -15 °C.
8.3
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.
3. If this is possible using the available measuring equipment, check the bearing and stator
SIMOTICS FD 1MH1
Operating Instructions 08/2017
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.
winding temperatures.
Operation
8.3 Switching on the machine
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