APC VS 50 User Manual

Magnum VS –48 Vdc User’s Manual 

                                     

  Page 14 

OUT RELAY #6 

N/A 

 

 

 NO  N/A 

 

MINOR C 

N/A 

 

 NC  N/A 

 

 NO  N/A 

 

MAJOR C 

N/A 

 

 NC  N/A 

 

 
External Alarm Input Connections 
 
Four external alarm inputs with assignable relay outputs are available.  User 1 and 2 inputs 
respond only to external dry contact closures between normally open (NO) and common (C) and 
User 3 and 4 respond only to external dry contact openings between normally closed (NC) and 
C.  A Wago connector is located on the backplane card mounted in the left rear of the unit.  The 
Wago connectors accept wires 26 AWG to 20 AWG (0.129mm

2

 to 0.518 mm

2

).  To connect the 

user input, remove ¼ in (6mm) of insulation from the end of the wire.  Push down the white tab 
on the Wago connector, insert the stripped wire and release the tab to make the connection.  
Refer to Figure 3.9-1 for backplane board connections.   
 

#1 NO 

USER1NO 

#2 NO 

USER2NO 

 

#3 NC 

USER3NC 

 

#4 NC 

USER4NC 

 

#1 C 

USER1C 

 

#2 C 

USER2C 

 

#3 C 

USER3C 

 

#4 C 

USER4C 

 

 

 

 

WARNING:  Rectifier dc output circuits will be damaged if battery is installed 
incorrectly.  Before rectifier installation, ensure proper battery polarity and that 
the battery is isolated from the rest of the system  

 
The rectifier modules are shipped in separate containers.  Follow the procedure below to install 
a rectifier module.  Rectifiers may be installed even when the system is energized.  
 

1)  Remove the rectifier from its shipping container.