Centrifugal Fans direct driven with scroll - Nicotra Gebhardt
Centrifugal Fans direct driven with scroll - Nicotra Gebhardt
Centrifugal Fans direct driven with scroll - Nicotra Gebhardt
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Description<br />
Motors<br />
Electric connection<br />
196<br />
V<br />
400<br />
230<br />
50 87 Hz<br />
Direct <strong>driven</strong> centrifugal fans / RZA / Description<br />
The specially developed integral motors are designated as having protection class<br />
IP54 and heat class F.<br />
They are optimised to a high rate of efficiency, <strong>with</strong> speed that can be adjusted between<br />
0 and 100% via the frequency inverter.<br />
The motors are fitted <strong>with</strong> an easily accessible metal clamping box. To prevent<br />
overloading, PTC are inserted in the windings of the motors. In conjunction <strong>with</strong><br />
PTC release equipment or a frequency inverter <strong>with</strong> PTC connection, effective motor<br />
protection is guaranteed.<br />
The motors ex works are in star connection (Y). When operating <strong>with</strong> a frequency<br />
inverter, the links must be placed in delta connection (D) (see wiring<br />
diagram).<br />
All fans are delivered ready for connection. Electrical connection takes place in<br />
accordance <strong>with</strong> the enclosed operating instructions and observing the relevant<br />
applicable local regulations and <strong>direct</strong>ives. Every fan is accompanied by a connection<br />
circuit diagram. You can also find the relevant circuit diagram online under:<br />
www.nicotra-gebhardt.com.<br />
Frequency inverter operation<br />
Frequency inverter operation <strong>with</strong> a nominal voltage of 400V the edge frequency of<br />
87Hz must be set. The motor must then be delta (D) connected.<br />
The inverter exit voltage is a square function of the frequency and the voltagefrequency-curve<br />
has a corresponding shape. In the case of <strong>direct</strong> mains (400V)<br />
operation the motor should be star (Y) connected.<br />
If frequency inverters are allocated by the customer, then it must be ensured that the<br />
voltage gradient of the frequency inverter does not exceed the figure of 500V/µs and<br />
the maximum peak voltage at the motor terminals is kept to 1200V. Depending on the<br />
frequency inverter employed and the length of cable between the frequency inverter<br />
and the motor, additional units (such as motor choke, active sinus filter, for example)<br />
may be needed to ensure that the limits named above are kept to.<br />
Non-compliance may lead to damage to the motor!
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