Power Electronics SD750FR, Hardware And Installation Manual

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SD750FR POWER ELECTRONICS
64
CONTROL CONNECTION
EN
As shown in the figure above, the SD750FR 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. (Example: ZIEHL - PTC MSR 220Vi).
The SD750FR series features a dV/dt filter and a unique CLAMP
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system that reduces dV/dt and voltage
peaks in the motor windings. This reduces the risk of voltage leaks 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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Only in equipment with rated voltage of 690 Vac.