ing” - remain energized until power is re- moved, ”Fire Following” - de-energize a short time after the fire is no longer detected. The “J2” connector provides connections for both normally open contacts and normally closed contacts on the Fire Relay.
2.7.2Fault Relay
The Fault Relay is a normally energized re- lay. It will de-energize when a Fault occurs. This means the detectors Fault Relay is in the “Fault” state when the detector has no power, and remains in the “Fault” state until the detector is powered up and operating nor- mally. The “J4” connector provides both normally open contacts and normally closed contact on the Fault Relay.
2.7.3Verify Relay
The Verify Relay will energize when a “Veri- fied Fire” is declared. Depending on the con- figuration the relay will: “Latching” - remain energized until power is removed, “Fire Fol- lowing” - de-energize a short time after the fire is no longer detected. Further, the “Verify Control” configured to Level 0 will disable the Verify Relay, and Level 7 causes the Verify Relay to operate in parallel with the Fire Re- lay. The connector labeled “Verify In” and “Verify Out” provides connections for nor- mally open contacts on the 3100-02 and 3100- 04 or normally closed contacts on the 3100- 03 and 3100-05. The configuration of Nor- mally Open or Normally Closed contacts is fixed and can only be changed by the fac- tory.
2.7.4Auxiliary Fault
The Aux. Relay is energized whenever the detector fails the “Lens Check” test. This fault indicates the detectors inability to “see” a fire. Normally, cleaning the lens will clear this fault. Because a dirty lens is the most common type of fault, a separate indicator connected to this relay will simplify mainte- nance. The connector labeled “Aux In” and “Aux Out” provides connections for Normally Open contacts on the 3100-03 and 3100-04 models or Normally Closed contacts on the
3100-02 and 3100-05 models. The configu- ration of Normally Open or Normally Closed contacts is fixed and can only be changed by the factory.
2.7.54-20 mA Operation
The 3100-06 uses a 4 to 20 mA current draw circuit to indicate Fault, Fire, Verify Fire and Normal Mode. The current draws are as fol- lows:
Fault Mode: | 0 mA |
Normal Mode: | 4 mA |
Alarm Mode: | 12 mA |
Verify Mode: | 20 mA |
The 4-20 circuit is connected across the J2 connector at contact 6 and 7 where connec- tion 6 is the negative side and connection 7 is the positive side. Additionally, a jumper be- tween contacts 7 and 8 must be made.
