Honeywell 5704, Operating Instructions Manual

Page: 52 / 191

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MAN0448_Issue 13_2010 5704 Control System
005704-M-5001 A03249
CHAPTER 3 CONTROlS AND FACIlITIES
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2.3 Status lEDS
2.3.1 CHl (Channel) lEDs
The four CHL alarm LEDs on the front panel of the control card provide
multi status indications for each channel. These LEDs indicate as
follows:
a. FAUlT AlARM - Flashing Amber CHL LED
The fault condition is shown by the CHL LED flashing amber as
shown below:
This provides an indication in the event of a sensor hardware failure,
if the sensor signal is outside pre-defined limits or if the channel card
has detected a channel hardware or software fault.
b. INHIBIT AlARM - Steady Amber CHL LED
The inhibit condition is shown by the CHL LED in a steady on amber
condition as shown below:
This indicates when the channel is in the inhibit condition. This
condition can be selected manually and remotely, or occurs
automatically:
during start-up for a pre-defined period of typically 30
seconds,
when carrying out certain engineering functions such as zero,
span, 1st span and alarm test.
During the inhibit condition, the channel card will continue to read
the gas sensor reading, however, no action is taken in the event of
an alarm condition being exceeded.
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