NAA 70/2-D Bosch Rexroth Indramat
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The Bosch Rexroth Indramat NAA 70/2-D is a mains connection module from the VM Amplifier Drives series. It features an integrated charging connection and power contactor, with a rated power of 47 kVA at 45 degrees Celsius. The module is cooled by natural convection, weighs 8.4 kg, and operates with a rated voltage of 400 VAC and fuse rating of 100 A at 660 V.
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Product Description:
The NAA 70/2-D is a mains connection module produced by Bosch Rexroth Indramat for the VM Amplifier Drives series. It links the plant supply network to associated amplifier racks, providing overcurrent protection and line conditioning for motion-control cabinets. In a drive cabinet, it serves as the controlled entry point between the incoming line and the downstream power section. By combining line isolation and switching elements in one enclosure, the unit simplifies the power interface section of an industrial automation system and reduces wiring complexity inside the cabinet.
Within the cabinet, the module accepts an input of 400 VAC at a network frequency of 50 Hz. Its continuous thermal rating reaches 47 kVA at 45 °C, allowing several amplifier axes to be energized from one device. The assembly is protected by a 100 A (660 V) high-speed fuse, and the design uses 3 conductive paths to match common plant distribution schemes. A charging connection precharges the DC-link capacitors, an additional mains filter suppresses conducted noise, and an internal power contactor provides remote line isolation. This startup sequence reduces electrical stress when the cabinet power section is energized from an uncharged state.
Thermal management relies on natural convection, so the unit operates without fans. The housing mass of 8.4 kg adds thermal inertia that helps limit temperature rise during current surges. As a Mains Connection Module, it is typically installed at the top of the drive stack where line cables enter the cabinet. Overcurrent clearing uses a High-Speed (M1-f1) fuse element, which opens quickly to limit let-through energy at the amplifier input. This arrangement keeps the incoming power functions concentrated in one location within the cabinet.
Frequently Asked Questions about NAA 70/2-D:
Q: What type of charging connection does the NAA 70/2-D provide?
A: The NAA 70/2-D features an integrated charging connection for simplified installation.
Q: How is the NAA 70/2-D cooled during operation?
A: This module uses natural convection as its cooling method, operating without fans or forced air cooling.
Q: What fuse type and rating are included with the NAA 70/2-D?
A: The NAA 70/2-D is equipped with a high-speed (M1-f1) fuse rated at 100 A (660 V).
Q: Does the NAA 70/2-D include a mains filter?
A: An integrated additional filter is included for mains filtering in this model.
Q: What is the rated power output of the NAA 70/2-D at 45°C?
A: This module is rated for 47 kVA of power at a temperature of 45°C.
