3-O&M_Settings_r1r Section 3Page 36
EBTRON, Inc • 1663 Hwy 701 S., Loris, SC 29569 • Toll Free: 800-2EBTRON (232-8766) • Fax: 843-756-1828 • EBTRON.com
3.13. FAN AIRFLOW ALARM
The fan alarm is available on Advantage IV transmitters when the FAN TYPE is set to ARRAY using the
ARRAY WIZARD. The fan alarm can be used to detect a malfunctioning fan in an array, provide notification
of the malfunction and/or ignore the airflow measured from the fan. The latter being particularly useful if a fan
has failed without a backdraft damper and there is still indication of airflow.
An “active” alarm is displayed on the LCD for the fan numbers in a fault condition and can be assigned to
analog output AO2 as a multi-state analog output based on the first fan number to indicate an active fault.
A probe number is labeled on each probe hang tag (Probe x of y). The leftmost receptacle used on the
transmitter when viewed from the display side is always designated as Connector 1 (C1). Additional
connectors increment sequentially from left to right on transmitters with more than one receptacle. Fan array
models with two rows of 4 receptacles, increment left to right, C1 to C4 on the topmost row closest to the
cover, then left to right, C5 to C8 on the lower most row.
Probe numbers (P1 to Py) are dynamically assigned by the transmitter after initial power up, left to right,
based on the connector receptacle used.
Fan array models (-F/An) must follow this convention if two probes are located in each fan inlet (i.e.
put probes for fan 1 in C1 and C2, fan 2 in C3 and C4, etc.)
To assign the alarm to analog output, AO2, see “AO2 Assignment”. AO2 becomes a multi-state analog
output with the inactive state based on the setting for NO FAULT.
An active alarm will set AO2 in increments of 10% of the full-scale output based on the first fan number to
indicate an active fault (ex. Fan 2 fault will output 20% of the full scale).
The FAN ALARM submenu contains the following parameters:
• FAN ALRM (Fan Airflow Alarm Type)
• ON ALRM (Action on Active Fan Alarm)
• ALRM UM (Fan Alarm Units of Measure)
• SETPNT (Fan Alarm Setpoint)
• DELAY (Fan Alarm Delay)
• ZERO OFF (Fan Alarm on Zero Flow)
• RESET (Fan Alarm Reset Method)
There are three alarm types, MIN, DEV and MAX, available that target specific failures with the array.
3.13.1. Fan Airflow Alarm Type [FAN ALRM]
Enable and select one of the fan airflow alarms.
[Menu path: SETTINGS >↓ FAN ALARM > FAN ALRM]
Default: OFF
Optional Settings: DEV, MIN, %MAX
Care should be taken when selecting the appropriate fan alarm. Fans that have completely failed in
an array that do not have backdraft or isolation dampers may have significant reverse airflow through
the fan. The EBTRON -F probe will read approximately a false high reading when airflow across the
sensor is in the reverse direction.
FAN ALRM = DEV. The alarm becomes active when one fan in the array is deviating by a user specified
percentage, high or low, from the other fans.
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