SYSTEM OPERATING DESCRIPTION
The 4020 Operator Interface Panel, hereinafter called the interface panel, shows the following under normal
conditions:
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Green “POWER ON” LED ON (indicating that AC power is applied)
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All other interface panel indications OFF
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Alphanumeric LCD display states that the system is normal, as shown below.
SYSTEM IS NORMAL
08:23:43
MON 04-APR-94
I
I
Abnormal conditions are indicated on the interface panel by flashing the alarm, supervisory, or trouble LED and
sounding the tone-alert. The alphanumeric display provides information as to the point status (alarm, supervisory,
and trouble), type of alarm (smoke detector, pull station etc.), number of abnormal conditions in the system, and a
custom label. Alarm, supervisory, and trouble conditions each have their respective acknowledge key. Pressing the
appropriate acknowledge key will silence the tone-alert. However, the LED indicating the abnormal condition
remains illuminated until all initiating devices are restored to normal.
Figure 1
Interface Panel
(Access Door Closed)
If your system is configured with the CRT or printer option, point status is also displayed on these devices. The CRT
option controls various system functions. It can acknowledge system status changes, silence alarm signals, and
perform system reset procedures.
When an initiating device (monitor point) senses a Fire Alarm Condition (heat, smoke, manual activation, etc.),
notification appliances (signals) and the tone-alert sounds, and the FIRE ALARM LED turns ON and flashes,
indicating that a Fire Alarm condition is present. In addition, depending on the nature of the alarm condition, relays
trip, the city circuit activates, and various programmed events occur. The tone-alert continues sounding until the
alarm is acknowledged.
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