User's Manual

MDR2400-SR, MDR5800-SR and Orion 5825-SR
Issue 10 Page 25
2.3.12 IU DC Power Input
This connector (socket) is used for power input to the IU. The connection is made
using 2 or 3-core cable. The cable is connected to a two pin GREY connector on the
MDR radio and a THREE pin GREEN connector on the Orion unit - both are plugs.
The polarity-sense (labelled) must be observed and implemented. A ground
connection is available on the three-pin connector. This ground connection is not
required if the ground terminal is connected (2.3.15).
2.3.13 Fuse Holder
This holder is used to hold a fuse (2A, slow blow fuse).
2.3.14 ON/OFF Switch
This switch is used to control power input to the Indoor Unit (and indirectly the Outdoor
Unit). No switch is fitted to the Orion IU. The unit will start up as soon as the required
DC voltage is applied.
2.3.15 Ground Terminal
This is used to accept connection to an earth strap, terminated with a crimped earth
lug. Refer to the installation chapter for details on wire/earth lug requirements. A
ground connection is also available on the three-pin IU DC power connector.