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Model SS4-A/-A2 Multi-Spectrum Digital Electro-Optical Fire Detector
Installation Guide and Operating Manual
MAN0931_V3_1510-001_RevH_06-13
2.2.4
Wiring the Detector Module.
a. Insert the cables into the metal enclosure base through one of the conduit openings. Refer to
Figure 6.
b. Connect the 24 Volt DC power supply wires to pins 1 (-) and 4 (+) of the J1 or J2 connector,
observing the correct polarity. Refer to Figure 2. Firmly tighten down the two slotted screws
with a small screwdriver taking care not to over-tighten the screws.
Pins 2 and 3 of the J1 and J2 connectors are the RS-485 interface used only for downloading
the FirePic from the Detector's non-volatile memory, or for viewing the Tri-Mode Plot. It is
recommended to wire pins 2 and 3 to a separate junction box and properly identify them for
future use. A color-coded, multi-connector, shielded, UL-rated cable with 18 to 24-gauge wire is
recommended for connecting to J1 or J2.
guideline:
Verify
Relay
*Fault Relay
* Fault relay is shown in the energized condition during normal operation (No Fault).
2.2.5
Wiring the SS4-A/-A2 Detector for 4 or 20 mA Current Mode Operation (Optional)
For applications requiring a 4-20 mA analog output, order the Detector with the Optional 4-20 mA Module
Assembly, P/N MA420-4. The module must be Factory installed and certified along with the Detector.
The following analog output levels are available from the Detector equipped with the MA420-4 Module.
The module is capable of driving a maximum load impedance of 283 Ohms:
NORMAL Operation
ALARM
FAULT
To use the analog output of an SS4-A/-A2, make the following connections:
24 V DC
24 V DC RTN
Pin 1
Black
Green or Blue
DC R
( - )
RS-485( - )
ETURN
Figure 2: Model SS4-A/-A2 Detector Wiring
(Bottom View of SS4-A/-A2 Detector Module)
4 +/- 0.6 mA
20 +/- 0.6 mA
< 0.6 mA
J2, pin-4
J2, pin-1
The following color-coding is suggested as a
Pin 2
Pin 3
White or Yellow
RS-485( + )
Pin 4
Red
+24 VDC P
( + )
OWER
8
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