APC VS 100 User Manual

Magnum VS –48 Vdc User’s Manual 

                                     

  Page 13 

Figure 3.9-3 shows the alarm output connection designations.  Whenever possible use the 
common and normally closed contacts. If the alarm wiring gets pulled loose, or the controller is 
removed, you will get an alarm.  The Major relay is energized (C-NO contacts closed) during 
normal (non-alarm) operating conditions; the other relays energize when an alarm condition 
occurs.  If your Major relay wiring uses the C-NO contacts, then a major relay output will be 
seen whenever the controller is removed from the shelf.   
 

 

 

 
Output Relay 2-6 Connections 
 
Output Relays 2 through 6 are virtual relays and are not available for physical connection by the 
user.  The small size of this unit limits the number of relays that can be placed in the system.  
These output relays are supported by the controller and reported by the network management 
card.  Any alarm condition can be programmed to map to one of these relays.  The alarm will 
activate the relay, illuminate the front panel Out Relay LED, and send the relay output message 
to the network management card. 
 

 NO 

 

 

OUT RELAY #1 

C 

 

 

  

NC 

   

OUT RELAY #2 

N/A 

 

 

OUT RELAY #3 

N/A 

 

 

OUT RELAY #4 

N/A 

 

 

OUT RELAY #5 

N/A 

 

 

Output Relays 
(J411) 

User Inputs 
(J412)