TM0048
LaserNET Program User's Guide
September 2003
6-10
Airflow can be highly variable and will fluctuate with changes in temperature, humidity or pressure within
the monitored hazard.
The high airflow threshold should be set at least +20 above the normal airflow for the system.
The threshold can be set in increments of one with +40 absolute value as the maximum.
The window will display the factory default or programmed setting. To change:
1. Select the Threshold field in the High Air Flow box. Enter the new value.
2. Select
<OK>
to save the setting.
6-5.3.4
AIRFLOW FAULT DELAYS
This feature is used to prevent transient changes in airflow from causing unwanted fault conditions. A small
delay is normal for most applications, with the default being 10 seconds. When this feature is enabled, a
fault condition will activate when the threshold is crossed and time delay is satisfied. The following condi-
tions apply:
The current level in the real-time airflow display will accurately reflect the airflow level throughout the
delay period.
The fault indicator on the display and control graphic will not light until the delay is satisfied.
If the airflow level drops below (for high airflow) or rises above (for low airflow) its programmed level
during the delay period, the delay timer will be reset.
Delays can be set from zero to 60 seconds in one second increments.
Different delays can be programmed for high and low airflows.
The window displays the factory default or programmed settings. To change:
1. Select the Delay field in the Low Air Flow box. Enter the new value if desired.
2. Select the Delay field in the High Air Flow box. Enter the new value if desired.
3. Select
<OK>
to save the configuration.
6-5.3.5
POWER SUPPLY FAULT DELAYS
These are used to prevent transient problems with the power supply from causing unwanted fault condi-
tions. A typical example would be a power supply delay to prevent a transfer from normal power to emer-
gency generator from generating a fault from loss of AC power. When programmed, a fault condition will
activate when the condition is detected and the time delay is satisfied. The following conditions apply:
Delays can be set from zero to 60 seconds in one second increments.
Different delays can be set for power supply and Detector faults.
The window will display the factory default or programmed settings. To change:
1. Select the Delay field in the Power Supply Fault box. Enter the new value, if desired.
2. Select
<OK>
to save the configuration.
6-5.3.6
ISOLATION OUTPUT
Enable Isolation is checked to allow the Isolate relay to operate when the Detector is isolated (for Detector
cleaning, etc.). If the Enable Isolation is not checked, the fault relay will operate when the Detector is
isolated.
6-5.4
Output Latching
The alarm and fault outputs can be configured to be either latching or non-latching. Alarms, when non-
latching, can have a latch period programmed.
To begin configuration of latched and non-latched alarms and latching faults, select
Options>Configure>Output Latching
. The Output Latching window (Figure 6-10) will appear, displaying
the current settings.
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