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INSTALLATION AND OPERATION MANUAL – OWNER'S RECORD FFD MANUAL – FILTER FAILURE DETECTOR
7 OPERATION
7.1 GENERAL OPERATION
When the sensor setup is complete, the operation of the FFD may be monitored from the front panel by checking the
STATUS LED
. During normal operation, the system settings are as follows:
•
The STATUS LED is illuminated GREEN to show that power is present, and no alarms exist.
•
The STATUS LED flashes at one-minute intervals to indicate the completion of the averaging period.
•
Both alarm relays will be non-energized.
7.2 ALARM OPERATION
The FFD has two independent alarm relay outputs whose levels are set during STEP 4 of the setup procedure (see page 17).
•
RELAY 1 – High-level or Limit alarm:
this alarm level can be adjusted by the user to suit the application.
•
RELAY 2 – Early Warning alarm:
this alarm level is fixed at HALF the level of the high alarm setting.
The
STATUS LED
indicates the alarm status (see table below for details).
STATUS LED
MEANING
EFFECT
GREEN
Emissions are
below
HALF of the ‘high level’ setting (i.e. below
the early warning alarm threshold)
.
RELAY 1 – OFF
RELAY 2 – OFF
ORANGE
Emissions are
above
HALF the ‘high level’ setting (this triggers
the EARLY WARNING alarm).
RELAY 1 – ON
RELAY 2 – OFF
RED
Emissions are
above
the ‘high level’ setting (this triggers the
HIGH alarm).
R
ELAY 1 – ON
RELAY 2 – ON
Rapid Pulsing
GREEN <> RED
Internal error
The relays and 4–20 mA output retain their
pre-fault state (refer to Troubleshooting
on page 23).
The alarms are non-latching, so that when the plant returns to normal operation, the alarms are automatically cleared
(after the alarm delay period of one or two minutes).
Typically, the alarm relay outputs are connected to an external latching alarm module.