UNIPOINT OPERATING MANUAL
2306M5001 MAN0638 ISSUE 7 01/2011
15
8.5 Fault Codes
Below are the fault codes and recommended action to clear the fault.
8.6 Inhibit
The controller is put into inhibit via a normally open switch connected to the inhibit terminal or
when entering configuration mode. The inhibit is maintained until the switch is opened again or
on return to normal operation mode.
Additionally, an inhibit signal of between 1.5mA to 2.5mA can be signaled to the controller from
a field device. This facility is only available on mA version controllers (see section 9).
When in inhibit the alarm relay and sounder do not operate. The alarm LED will operate if the
alarm threshold is exceeded. The 2nd line of the LCD will show Inh (except in configuration
mode where a slow flashing fault LED indicates the inhibit).
The controller can also be disabled using the disable function in the configuration mode (see
section 9).
See section 10 for details of how the relay delay and hold function is affected by inhibit.
8.7 Overrange
When the gas reading exceeds full scale ‘Or’ replaces the gas reading to indicate an overrange
condition. The 2nd line of the LCD continues to show the alarm state. If alarm level 3 is
configured latching then the overrange condition will also latch (default for 3 wire mV version).
8.8 Self Test
The controller enters a self test routine at power on. It can also be forced into a self test by
pressing the
3
button in normal operation. The controller automatically conducts a self test at
regular intervals.
FAULT CODE
DESCRIPTION
TROUBLE SHOOT
F
-
S
Sensor / wiring fault
Check sensor / field wiring
F
N
D
Negative drift
Calibrate detector
F
I
F
Excessive interference
Check field wiring
F
R
RAM fault
Replace controller
F
C
Memory failure
Replace controller
F
E
Configuration error
Replace controller
