Operating Instructions – Explosion-Proof AC Motors DR63/eDR63, DVE250/280
41
6
Soft-start units
Duty Types and Limit Values
6.3.4 Notes for safe operation
General
information
Install the frequency inverter outside the potentially explosive atmosphere.
Thermal motor
protection
Only motors that are equipped with a positive temperature coefficient thermistor (TF) are
permitted for operation on a frequency inverter to ensure that the permitted limit temper-
ature is not exceeded. The positive temperature coefficient thermistor has to be evalu-
ated using an appropriate device.
Motors that are suitable for frequency inverter operation have an additional frequency
inverter nameplate.
EMC measures The following components are permitted for MOVIDRIVE
®
and MOVITRAC
®
frequency
inverters:
• Line filters of the NF...-... series
• Output chokes of the HD... series
• Output filter (sine filter) HF..
If an output filter is used, the voltage drop at the filter must be taken into account.
Gear units When parameterizing FI-controlled gearmotors, you have to observe the n
emax
and
M
amax
values of the gear unit.
6.4 Soft-start units
Soft start units are permitted for motors of category 3 when the motors are equipped with
a TF temperature sensor and meet the requirements of EN 60079-14. During startup,
you must verify and document whether temperature monitoring is effective and whether
the motor starts up correctly. The motor must be disconnected from the supply system
when the protection device trips.
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