Altivar Process 900 Variable Speed Drives Page 52 Altivar Process ATV900 Drive Systems and Altivar Outdoor

52 2 3 4 5 6 7 8 9 10 2 3 4 5 6 7 8 9 10 Description Variable speed drives Altivar Process ATV900 ATV960 high performance drive systems Protection degrees The standard design of Altivar Process High Performance Drive Systems complies with UL Type 1 protection degree. This solution provides optimum cooling of the built-in frequency inverter modules and power components as well as maximum compactness. For operation in harsh ambient conditions, the increased UL Type 12 or UL Type 3R protection degree is available as an option. This solution consists of a clearly specified and tested cooling system with a separate cooling air channel which provides excellent reliability. About 90% of the heat losses are evacuated via the separate cooling air channel. The inside of the enclosure is cooled via fans located in the enclosure door. Standard UL Type 1 enclosure design In order to avoid internal air short-circuits, the power sections of the components are located in the main cooling air channel. The cooling air intake comes from a grid located in the bottom of the enclosure door. The internal fan, which is in a separate air channel, provides cooling of the power section. The air then comes out through the top of the enclosure. The heat losses from the control section are evacuated by a fan in the enclosure door. The incoming air temperature must be between 0 C / 32 F and 40 C / 104 F (-10 C / 14 F with enclosure heating) and can reach +50 C / 122 F with derating (class 3K3 according to IEC/EN 60721-3-3). Type 1 enclosures comprise: 1 An air intake (without filter mat) via a grid on the bottom of the enclosure door 2 A line reactor 3 Fans for the power section 4 A rectifier module 5 An inverter module 6 A dV/dt filter choke 7 An air outlet via a metal cover with protection against water splashes on the enclosure roof 8 An air outlet (without filter mat) with fans for the control section UL Type 12 or UL Type 3R protection degree With the increased protection degree with separate channels, the cooling air intake comes from the floor and goes out through the enclosure roof. The control section is cooled by filter fans located in the enclosure door. The incoming air temperature must be between 0 C / 32 F and 40 C / 104 F (-10 C / 14 F with enclosure heating) and can reach +50 C / 122 F with derating (class 3K3 according to IEC/EN 60721-3-3). UL Type 12 and UL Type 3R enclosures comprise: 9 An air intake for the power section via the enclosure plinth 10 A line reactor 11 Fans for the power section 12 A rectifier module 13 An inverter module 14 A dV/dt filter choke 15 An air outlet via a metal cover with protection against water splashes on the enclosure roof 16 An air outlet (with filter mat) with fans for the control section 17 An air intake grid (with filter mat) for the control section 9 10 13 12 11 14 15 16 17 1 2 7 8 3 4 5 6 UL Type 1 enclosure UL Type 12 enclosure

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