Relay Alarm Circuit Problem

Thread Starter

gmacdonald

Joined Oct 26, 2008
1
Hi,

I need help to solve a relay issue I have. Basically I have two separate relays with N/C contacts linked which open when energised to signal an alarm system. The two relays are to give two separate faults Urgent fault and non-urgent fault from a UPS but the external alarm system used by another team want the alarm into one set of contacts (urgent/non-Urgent) hence why they have been linked.
The Monitoring system I want to connect the UPS to I want 2 separate alarms urgent and non-urgent.

Can anyone think of a simple way to solve the problem of having one system having urgent/non-urgent alarms linked and another monitoring system getting the two separate alarms.
 

ElectricSpidey

Joined Dec 2, 2017
683
You could use 2 DPST relays, where one set of contacts send the separate signals to one alarm and the other set of contacts could be wired in series to a coil of a third relay that in turn can send a signal to the other team, that requires a combined signal.
 

Dodgydave

Joined Jun 22, 2012
8,292
You can use two separate Dpdt relays that each sends Urgent and Non-urgent as normal, and use the second set of contacts in series this will activate on either urgent/non urgent.
 
Last edited:

eetech00

Joined Jun 8, 2013
1,627
Hi,

I need help to solve a relay issue I have. Basically I have two separate relays with N/C contacts linked which open when energised to signal an alarm system. The two relays are to give two separate faults Urgent fault and non-urgent fault from a UPS but the external alarm system used by another team want the alarm into one set of contacts (urgent/non-Urgent) hence why they have been linked.
The Monitoring system I want to connect the UPS to I want 2 separate alarms urgent and non-urgent.

Can anyone think of a simple way to solve the problem of having one system having urgent/non-urgent alarms linked and another monitoring system getting the two separate alarms.
hi

when you say the contacts are “linked” what do you mean? The contacts are in series?

eT
 
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