Gas Detection (Australia) Pty Ltd
Page 24 of 24
M-GDA-2400-16/01/2017 Rev 8
Fault Finding
Fault
Action
Comment
Unit does not power up
Check 24vPSU and power supply.
Check fuse on main pcb
Check for short circuits on any field
devices using the 24V
Display showing unreadable
characters
System may need re-setting
Switch power off and then back on
after 5 seconds
If the system powers up correctly it
will revert to normal operation
Sensor readings are incorrect levels
Check range of sensor is the same
as range set inside 2400
Check sensor calibration. ( new
sensors are factory calibrated )
Enter input routine to check ( see
program set up)
Buzzer not sounding
Buzzer only sounds on LATCHED
alarms
Ascertain if latched alarms required
Relays not operating
Check alarm levels set in the input
program. Check that no delay has
been set as if delay has been set
the relay will not operate until
delay has expired
Enter input routine to check ( see
program set up)
Voltage o/p not working (0-10v)
Check that the o/p is ON ( see
menu-outputs)
Check it is set to VOLTS ( see
menu-outputs)
Check that 500R resistor is fitted on
the equipment end of the line NOT
the 4020 end
If using the GD690 to provide
isolation of the voltage o/p it will
be non linear below 0.7v ( 0-10v
o/p)
4-20ma o/p not working
Check that the o/p is ON ( see
menu-outputs)
Check it is set to current ( see
menu-outputs)
The input impedance seen from the
o/p pins to 0V must be less than
1000R (1K)
With wires to field device
disconnected measure field
resistance
Screen shows SYSTEM Fault
One of the sensor either has a low
4-20ma o/p < 3.0mA or is open
circuit. Check sensor connections
are correct and measure current
from sensors at the sensor. Consult
sensor Manual GD2525,
System Fault will occur if a sensor
is unplugged and its channel is still
active ( shorting link above the
sensor i/p is IN) .If removing a
sensor then this link should be
removed or fault will be indicated.
Summary of Contents for GD 2400
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