GDC-350 Operation Manual
5909-9000 Rev 1
19
delay function for the audible alarm has timed out. If DIP switch 5 is in the “down”
position, the audible alarm does not respond at all.
The internal audible alarm normally activates with a steady tone when a “high” gas
alarm condition exists. The internal audible alarm normally activates with a pulsing
tone when a fault condition exists. A fault condition could consist of any of the
following:
x
Remote solid-state sensor failure (open loop)
x
Analog signal from a remote 4-20 mA transmitter is not registering with the
GDC-350.
x
Smart sensor board is not plugged into the main board.
Fault conditions automatically override the ON/OFF DIP switch “5” if it
has been set to the “DOWN” position to turn off the audible alarm.
4.4. System Jumpers
There are two banks of jumpers located directly below the DIP switches. One bank of
nine (9) jumpers/18 pins (J7) and one bank of four (4) jumpers/8 pins (J6). These
jumpers allow the user to perform a wide range of set up and calibration functions.
The following table details the jumper settings for each bank of jumpers and explains
the function enabled when these jumper positions are selected.
Always set J6 jumpers first, followed by J7 jumpers.
Jumper 4 (located on J6) is used to set custom time delays for relays
and internal audible alarm. These functions are explained in
Section 4.6.
NOTE:
In Figure 4-2, the jumper tab for both banks is covering the “P1”
position.
