Nidec Digitax HD M75 Series Installation And Technical Manual

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Nidec Digitax HD M75 Series Installation And Technical Manual Manual pdf 32 page image

Safety information Product information Mechanical installation Electrical installation Multi axis system design Technical data32 Digitax HD M75X Series Installation and Technical GuideIssue Number: 5Where:V Air-flow in m 3 per hour (1 m 3 /hr = 0.59 ft 3 /min)Text Maximum expected temperature in °C outside the enclosureTint Maximum permissible temperature in °C inside the enclosureP Power in Watts dissipated by all heat sources in the enclosurek Ratio ofWhere:P 0 is the air pressure at sea levelP I is the air pressure at the installationTypically use a factor of 1.2 to 1.3, to allow also for pressure-drops in dirty air-filters.ExampleTo calculate the size of an enclosure for the following:• Three drives operating• External EMC filter for each drive• Braking resistors are to be mounted outside the enclosure• Maximum ambient temperature inside the enclosure: 40 °C• Maximum ambient temperature outside the enclosure: 30 °CFor example, dissipation of each drive: 101 W and dissipation of each external EMC filter: 6.9 W (max).Total dissipation: 3 x (101 + 6.9) = 323.7 WInsert the following values:Tint 40 °CText 30 °Ck 1.3P 323.7 WThen:= 126.2 m 3 /hr (74.5 ft3 /min) (1 m 3 / hr = 0.59 ft3 /min)3.11 Enclosure design and drive ambient temperatureDrive derating is required for operation in high ambient temperaturesTotally enclosing the drive in either a sealed cabinet (no airflow) or in a well ventilated cabinet makes a significant difference on drive cooling.The chosen method affects the ambient temperature value (Trate ) which should be used for any necessary derating to ensure sufficient cooling for thewhole of the drive.The ambient temperature for the four different combinations is defined below:1. Totally enclosed with no air flow (< 2 m/s) over the drive Trate = Tint + 5 °C2. Totally enclosed with air flow (> 2 m/s) over the drive Trate = TintWhere:Text = Temperature outside the cabinetTint = Temperature inside the cabinetTrate = Temperature used to select current rating from tables in Chapter 6 Technical data on page 983.12 Drive cooling fan operationThe drive is ventilated by an internally mounted fan(s).The drive cooling fan on all sizes is variable speed. The drive controls the speed at which the fan runs based on the drive's thermal model system.The maximum speed at which the fan operates can be limited in Pr 06.045. This could incur an output current derating. Refer to section 3.18 Fanreplacement on page 43 for information on fan removal.3.13 Braking resistor3.13.1 Compact braking resistorPoPl-------V 3 1.3 323.740 30–---------------------------------------=When using the compact brake resistor the drive must be mounted vertically.WARNING