General Monitors FL4000 Instruction Manual Download

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FL4000

Each time the Test Mode is activated and the Test Lamp is successfully detected, regardless of
which option is used, the FL4000 maintains a timestamp of the test. This timestamp is available to
the user via MODBUS registers 0x6A, 0x6B, and 0x6C.

2.4.3.1 Test Mode Initiation via Test Lamp

NOTE

: The Test Lamp sequence is depicted in Figure 7.

When the unit is in Operational Mode, the FL4000 recognizes the Test Lamp as a trigger to
activate the Test Mode. Within 5-8 seconds of the Test Lamp (3.5 mA with HART) flashing, the
FL4000 will detect the simulated flame source, drop the analog output to 1.5 mA (3.5 mA with
HART), and change the LED flashing to indicate “Test Mode Activated” shown in sequence #7 of
Table 3. The relay setting will remain at “Ready” during this operation.

Further continuous flashing of the Test Lamp in Test Mode enables the following sequence of
events:

•

After 2 seconds in Test Mode (Phase 2), the FL4000 indicates a Warning condition, by

setting the analog output to 16 mA, changing the LED flashing to indicate “Test Mode
Running” shown in sequence #8 (Table 3), and setting the relay to Warning State.

•

After a user-selectable time delay of 0-30

seconds (Phase 3), the FL4000 displays an

Alarm condition by setting the analog output to 20 mA, and setting the relay to Alarm State.
The LED sequence changes to sequence #9 (Table 3) “Warning” mode.

•

After 4.25 minutes in Alarm mode (Phase 4), the unit will return to Ready Mode by

dropping the analog output to 4.3 mA, restoring the LED flashing to “Ready” shown in
sequence #2 (Table 3), and setting the relay to Ready State. The FL4000 has now
returned to flame detection status.

NOTE

: After the test is initiated via the Test Lamp, all other commands are ignored until the Test

Mode is over. While in Test Mode, the unit will not detect flames. Interruption of the Test
Lamp flashing for more than 3 seconds will result in termination of the test sequence and a
return to Ready Mode (Phase 0).

If a relay is latched, it must be manually reset via the reset relays line or a MODBUS
command. There is a 10 second restart delay. After the unit returns to Ready State from
Phase 4, the unit waits for 10 seconds before a subsequent Test Lamp transition back to
Phase 1.

2.4.3.2 Test Mode Initiation via Grounding of Test Wire or MODBUS Command

NOTE:

Both grounding of the test wire and MODBUS command sequence are depicted in Figure

Momentary grounding of a test wire or the MODBUS test-mode-enable command causes the
FL4000 to enter Test Mode. Initiation of Test Mode is indicated by the analog output dropping to
1.5 mA (3.5 mA with HART) and LED flashing in sequence # 7 (Table 3). The Test Lamp is not
needed to enable Test Mode. If the Test Lamp is not used in Test Mode, the Test Mode times out
in 3 minutes.

Flashing of the Test Lamp in the Test Mode enabled via test wire or MODBUS results in the
following sequence of events:

Time delay can be set through MODBUS to any value between 0 and 30 seconds, and via dip switch to 0, 8, 10,

or 14 seconds.