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Motors with backstop
Motors with built-in backstop must be operated at a minimum rpm higher
than the value specified on the rating plate – e.g. FXM 850 min
–1
– to
prevent excessively high temperatures.
Heat input through the driven machine
It must be ensured that no quantities of heat greater than the maximum
heating values specified in table are conveyed from a mounted machine to
the interface with the motor (e.g. shaft and motor flange). This way it is
guaranteed that no point of the motor exceeds the temperature class.
Table 9:
Permissible surface heating at an ambient temperature of 40°C:
Temperature class
T6 = 85°C T5 = 100°C T4 =135°C
Permissible heating on the shaft 30K 45K 65K
Permissible heating on the flange 30K 45K 65K
Start-up
Please note!
Before mounting or start-up the insulation resistance is to be
measured by qualified technicians. The resistance must be
greater than 1 MΩ. A critical value is reached at 0.5 MΩ. If this
value is not reached, the motors must be dried.
The best way to do it is in an oven at temperatures up to 100 °C. To
eliminate any humidity, open the motor. To be entitled to any warranty
claims, contact the manufacturer in advance.
These works must be carried out by qualified technicians; in the course of
said works the manufacturer shall instruct said technicians on how to ensure
the explosion protection during reassembly. For the assembly and
disassembly, see the relevant repair instructions.
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