GarrettCom 4K-Series Manual De Usuario

Magnum 4K8 Switches      Installation and User Guide      (10/04) 

 

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The -48VDC terminal block on the Magnum 4K-Series Switch is located on 

the right rear of the unit and is equipped 
with five (5) screw-down lead posts (see 
Fig C5.0).  The primary terminals are 
identified as positive (A+), negative (A-
), and the secondary power terminals as 
negative (B-), positive(B+).  The 
chassis “earth” or  ground (GND), is a 
threaded post with a #6 nut.   
 

 Figure C5.0:  -48VDC Dual-Source, wiring connections to the External 

Terminal Block on a Magnum 48VDC with Dual-Source option   
 
Note: The GND should be hooked up first.  The 4K unit has a floating ground, so the 
user may elect to Ground either + or  = terminal to suit the customer’s use. 
 

use a digital voltmeter to measure the output voltage of the power supply and 
determine the lead which is  more “+ve potential”. The more “+ve” voltage lead from 
48V  or –48V supply must be connected to the post labeled “+”. 
 
 

The connection procedure is straightforward. Simply connect the DC leads to 

the Switch’s power terminals, positive (+) and negative (-) screws. The use of Ground 
(GND) is optional; it connects to the chassis. Ensure that each lead is securely tightened.  
The 24VDC & 125VDC terminal block on Magnum 4K-Series Switch also has 
everything similar to –48VDC info. Described above. 

 

The following must be adhered to in order to conform to UL requirements: 

1.   Minimum 14 AWG cable for connection to a Centralized DC power source. 
2.   Fastening torque of the lugs on the terminal block:  9 inch pound max. 
3.   Centralized DC Power Source cable securement, use at least four cable ties to 

secure the cable to the rack at least 4 inches apart with the first one located 
within 6 inches of the terminal block. 

To order the optional Dual-Source -48VDC power supply factory installed, 
order “Dual-Src48V” as a separate line item following the product model. 

 

    Example: Magnum 4K8-48VDC  

 

 

  Dual-Src-48V for regular model with no ON-OFF switch 

 

 

  Or Dual-Src48V-SWITCH for model with ON-OFF switch 

Similarly, order “Dual-Src24V” or “Dual-Src125V” as a separate line item 
following the product model. 

  

Example: 

Magnum 4K8-24VDC or Magnum 4K8-125VDC 

 

   

  Dual-Src24V for regular model with no ON-OFF switch 

 

   

  Dual-Src24V-SWITCH for model with ON-OFF switch 

 Operation of the Dual-Source Magnum 4K-Series-48VDC, 24VDC & 
125VDC Switch models are identical to that of the standard models.