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INM MTL SUM5 Rev 7
DRAFT - 09 June 2021 DRAFT - 09 June 2021
6 HORN RELAYS
6.1 HNA & HNB Horn Relays
• Two horn relays are provided as standard HNA & HNB.
• Any channel within the annunciator can be software congured to
operate the HNA or HNB relay as required.
• A volt free contact is available from each relay to switch an external
audible or 3rd party device.
• The relay is normally de-energised providing a N/O contact to activate
the horn when an alarm occurs.
• Contact rating 4A 24VDC (2A 120VAC).
• If horn relays are not required the relays can be software selected to an
alternative function. (Group Relay, Pushbutton Follower,
Watchdog Function)
WARNING !
Hazardous voltages may exist on the rear panel connections when
connectors are removed. Take care not to touch any exposed parts
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