As shown in the figure above, the SD750 drive and the ATEX relay must be installed in a safe zone,
outside the ATEX zone. This solution is valid for motors with "Ex d" or "Ex p" protection installed in zones
1 and 2, or motors with "EX nA" protection installed in zone 2. The external relay must be certified for
ATEX zones and Must be compatible with the following features: 24 Vdc power supply voltage, 2 safety
inputs, at least 2 open contacts and reset function. (Exemple: ZIEHL - PTC MSR 220Vi).
The SD750 series features a dV/dt filter and a unique CLAMP system that reduces dV/dt and voltage
peaks in the motor windings. This reduces the risk of sparks in the windings, motor overheating and
leakage currents through the bearings. In addition, it is possible to regulate the thermal protection of the
motor, thus increasing the protection against overheating in the motor. In self-ventilated motors, the
inverter may require an oversizing according to the derating curves provided by the motor manufacturer.
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