Unique Broadband Systems Ltd. DRU2KW User Manual

Manual No. x75mk3-11

x75-man-Rev11-0815.indd

The X75 Compact DC Power System operates at voltages that could potentially be 

hazardous.  Furthermore, inadvertent short circuiting of the system battery and/or 

rectifier by mis-connection or other error could be harmful.  This product should be 

handled, tested and installed only by qualified technical persons who are trained in 

the use of power systems and are well aware of the hazards involved.

 

All connections to the X75 should be carefully checked for errors before applying 

power to it.

 

3.3.1 Elevated Operating Ambient - If installed in a closed or multi-unit rack 

assembly, the operating ambient temperature of the rack environment may be greater 

than room ambient.  Therefore, consideration should be given to installing the X75 

in an environment compatible with the maximum ambient temperature of 50°C at 

full rated load, and at 70°C at derated load at a derating factor of 2.5%/°C from 

50°C to 70°C.

3.3.2 Reduced Air Flow - Installation of the X75 in a rack should be such that the 

amount of air flow required for safe operation of the equipment is not compromised.

3.3.3 Mechanical Loading - Mounting of the X75 in the rack should be such that a 

hazardous condition is not achieved due to uneven mechanical loading.

3.3.4 Circuit Overloading - Consideration should be given to the connection of the

X75 to the supply circuit and the effect that overloading of the circuits might have 

on over-current protection and supply wiring.  Appropriate consideration of the X75 

nameplate ratings should be used when addressing this concern.

3.3.5 Reliable Earthing - Reliable earthing of rack-mounted equipment should be 

maintained.  Particular attention should be given to supply connections other than 

direct connections to the branch circuit (e.g. use of power strips).”

 

The X75 is intended only for installation in a “RESTRICTED ACCESS LOCATION”.

Input/output short circuit ratings are 5KA AC for terminals connected to breakers 

and 450A AC for terminals connected to GMT type fuses.