7
Connection Terminal Descriptions
Terminal
No.
Mnemonic
Function
1
+IN
Power V. +IN is the power supply input to the flame detector
and is normally 24Vdc with respect to terminal 2. The current
consumption of detector can be monitored to determine the detector
status (Fault, Normal, Pre-alarm, Fire). If the detector is in latching
mode then this supply line must be broken in order to reset the
detector. A thermal fuse within the detector will blow and break the +IN
connection if the detector operating temperature is exceeded.
2
-IN
Power Supply 0V. –IN is the return path for the detector supply current.
-IN is also internally connected to terminal 4.
3
+R
Remote Detector Test Input +V. No connection to +R is necessary if
the detector optical and circuit test feature is not required. If 24Vdc is
applied to terminals 3 and 4 the detector internal optical test sources
will activate to simulate a flame. The detector yellow test LED will
flicker to indicate an optical test is progress. The detector will then
alarm indicating that the test was successful.
4
-R
Remote Detector Test Input 0V. No connection to -R is necessary if the
detector optical and circuit test feature is not required.
-R is internally connected to terminal 2.
5
6
RL1
Flame Relay RL1. This volt free contact is normally open (N/O) and
only closes when a flame has been detected. If the detector is in
latching mode (see DIL switch settings) the contact will remain closed
once a flame has been detected. Only when the detector IN is
broken will the detector reset and the contact open once again. The
contact can be changed to a normally closed (N/C) state by moving the
link on JP1 in the rear of the detector.
Maximum relay contact ratings: Power=3W, Current=0.25Amp,
Voltage=30Vdc. Resistive loads only.
7
8
RL2
Fault or Pre-alarm Relay RL2. This volt free contact is normally closed
(N/C) if the detector has no faults and the supply voltage between
terIN and –IN is the correct value. If the detector mode is
changed (see DIL switch settings) this relay can be de-energised to
reduce the detector current consumption. Alternatively RL2 can be set
to provide a pre-alarm fire signal. The normal contact state can be
changed state by moving the link on JP2 in the rear of the detector.
Maximum relay contact ratings: Power=3W, Current=0.25Amp,
Voltage=30Vdc. Resistive loads only.
Table 2
Connection Terminal Descriptions
Selectable Detector Functions
(DIL Switch Settings)
Fig 6
DIL Switch with Detector Front Cover Removed (Normal factory settings shown)
Selectable Functions
DIL Switch Settings
Relay RL2 Function:
1
2
RL2 off (No fault relay) – For lowest detector current consumption.
0
0
RL2 off, or UV pre-alarm, flame or electrical sparks detected.
1
0
RL2 energised on IR pre-alarm
0
1
RL2 detector fault relay (Energised if detector powered and no faults)
1
~ 1
Detector Supply Current (Detector Status
):
[-/ = see Output Mode below]
3
4
Low current mode, 3mA / 9mA (RL1 Only), 8mA / 14mA (RL1 & RL2)
0
0
Two-wire current signalling only. No relays operating. 4-20mA, 4/20mA
1
0
Two-wire current signalling 8-20mA, 8/20mA and both relays operating.
0
1
Two-wire current signalling 8/28mA and both relays operating.
1
~ 1
Output Mode:
5
(-) Proportional analogue supply current.
Non-latching fire alarm signalling. (-)
0
(/) Step change, supply current.
Latching fire alarm signalling. (/)
~ 1
Response Time:
6
7
Slowest
≈
8s
0
0
Medium
≈
4s
1
~ 0
Fast
≈
2s
0
1
Faster response times reduce the optical interference immunity.
Very Fast
≈
1s
1
1
Sensitivity:
See EN 54-10
8
Low Class 3
0
High Class 1
~ 1
Factory settings ~
Table 3
DIL Switch Settings
DIL Switch
SENSITIVITY
Low Class 3
High Class 1
0
1
1 2 3 4 5 6 7 8
6
