XYCOM XVME-655 Voltage module

If a particular application is operating on the edge of the power dump safe operating area, you may see the red and green diagnosis LEDs both come on together, indicating a ballast circuit overload. The additional regenerated energy can be dissipated by using extra ballast resistors connected to the NMD20 power supply. The connection used is shown in Figure 2-3. Note: Only the NMD20 power supply has the external connections that allow extra ballast resistors to be added.

24V Supply 

In common with the drives, both power supply types require a separate 24V DC supply to power internal control circuits, which allows the operation of communication and diagnostic facilities to be maintained in the event of a 3-phase power failure. The supply is brought into the power supply via connector X1. 24V Power Supply Rating The 24V DC power supply required to support communications and system diagnostics is also required to supply drive cooling fans (if fitted) and motor holding brakes (if fitted).

SV-M Drives 

SV-M Drives are designed for use in multi-axis systems, where two or more drives can share a single power supply. The three higher power drives share the same package style and dimensions and can be through panel mounted. Note the same style and dimensions are also used for the NMD10 and NMD20 power supplies, which allows consistent in-line mounting of drives and supplies. Dimensions and Mounting Details All drives and power supply units can be mounted directly on to a flat surface, as shown in Figure 2-4. The recommended mounting position is upright, as shown, with a minimum of 65mm clearance above and below the drive for good ventilation.

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