Ebtron GTC116 Installation Manual - Ebtron
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5.6 GTC116 ‐ Alarm Features
Analog output AO2 (OUT2) can be assigned to function as an alarm output. The AO2 alarm output can be
assigned in the SETUP menu to operate as an average alarm (A02
ASGN=ALRM) or as a trouble alarm (AO2
ASGN=TRBL) for monitoring the status of the transmitter and sensors. The AO2
ASGN= setting is located in the
ANALOG OUT submenu of the SETUP menu. The transmitter LCD display will indicate the Alarm status for 2
seconds, and will cycle through any other alarms if multiple alarm events are active for 2 seconds each, and then
display the current actual flow for 2 seconds. Detailed set up of the Alarm features is shown in the Setup menu.
5.6.1 Average Alarm (AO2 ASGN=ALRM)
AO2 output is assigned as an average airflow alarm output. Useful for applications where a low flow alarm or a
high flow alarm for operation outside of a defined range (setpoint and tolerance) is required.
5.6.2 Trouble Alarm (AO2 ASGN=TRBL)
AO2 output is assigned as a transmitter trouble alarm indicating a fault within the transmitter or a sensor of the
airflow measurement system. The transmitter LCD will indicate a trouble code and a brief description of the
trouble. Contact EBTRON customer service for additional information or assistance with trouble codes.
5.6.3 No Fault (NO FAULT=HI)
When AO2 output is assigned as an alarm, this setting configures the normal output condition to be HI or LO
relative to the full scale analog output level selected when no fault condition exists.
5.6.4 Alarm Indications
Table 6 details the alarm types, LCD indications and AO2 alarm output indication. User can select either or both of
the two Average Alarms or the Trouble Alarm.
5.6.5 Low Alarm ‐ “LO ALRM= ON”
The Low Alarm is activated when the average airflow falls to a defined level below the SETPNT= value. The defined
level is equal to the SETPNT= value minus the calculated value of (TOL= value * SETPNT= value). Once active, the alarm
can be cleared when the average airflow rises above the set point minus calculated tolerance value.
5.6.6 High Alarm ‐ “HI ALRM= ON”
The High Alarm is activated when the average airflow rises above a defined level above the SETPNT= value. The
defined level is equal to the SETPNT= value plus the calculated value of (TOL= value * SETPNT= value). Once active,
the alarm can be cleared when the average airflow falls below the set point + calculated tolerance value.
5.6.7 Trouble Alarm ‐ “AO2 ASGN=TRBL”
The Trouble alarm provides trouble codes useful for isolating setup issues or problems within the transmitter or
sensors. The transmitter LCD will indicate TROUBLE! regardless of whether AO2 is assigned to TRBLE. The
Diagnostic submenu can be engaged for the error code and a brief description of the trouble. Contact EBTRON
customer service for information on troubleshooting using the Trouble error codes.
Table 6. GTC116 Alarm Types and Notifications
ALARM OUTPUT
ASSIGNMENT TYPE
LOCAL LCD DISPLAY OF ALARM
TYPE AND NOTIFICATION
ANALOG OUTPUT 2
ALARM INDICATION
NETWORK
ALARM INDICATION
**LOW ALARM**
(Average Alarm)
Display alternates between **LOW
ALARM** (then any other alarms) and
actual reading for 2 seconds each.
**HIGH ALARM**
(Average Alarm)
Display alternates between **HIGH
ALARM** (then any other alarms) and
actual reading for 2 seconds each.
TROUBLE !
(Trouble Alarm)
Display indicates TROUBLE !
(Refer to DIAGNOSTIC menu to obtain a
brief description of the error and any
other alarms).
On alarm or trouble, OUT2 is
active high (or active low)
relative to the full scale
maximum (or minimum)
analog value as determined
by the SETUP Menu “NO
FAULT=” selection. Individual
sensor velocities can be
viewed using the Diagnostics
submenu.
Alarm Status is available at
BACnet Objects and
Modbus Registers. Refer to
BACnet Objects List and
Modbus Register Map for
additional detail.