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MVE Biological Systems
TEC 3000 Operating and Maintenance Freezer Manual
13289499 Rev H •
36
7.1.5. User Defined Alarms
The TEC 3000 employs 18 different audible/visual alarms. These alarms are designed to alert
the user to possible problems with the freezer temperature, LN2 level, controller power, and
LN2 supply. In the event that a condition triggers an alarm, an audible buzzer will sound, that
particular alarm will appear on the TEC 3000 LCD display, and the global remote alarm
contacts will switch to alarm state. If the triggered alarm is one of the four specified discrete
contacts, then that contact will also switch to alarm state. For more information on the global
remote and discrete contacts, refer to the Remote Alarm Monitoring section.
To clear an alarm, first correct the condition and then press the “Alarm Mute” key or restart the
controller. If the alarm condition is still present, then pressing the “Alarm Mute” key will only
mute the audible buzzer for 30 minutes. The condition must be corrected in order to clear the
alarm.
NOTE: Most TEC 3000 alarms have a one minute delay to avoid false positive or
nuisance alarms. * denotes alarms that do not have a one minute time delay.
Table 1: TEC 3000 alarms and descriptions
Alarm Display Description
High Temp A*
Can be Enabled or
Disabled Temperature A is reading at or above the Temp A High Alarm setting
When disabled, there will be no visible or audible alarm indication. The
alarm event code will continue to be recorded in the internal data log.
High Temp B*
Can be Enabled or
Disabled Temperature B is reading at or above the Temp B High Alarm setting
When disabled, there will be no visible or audible alarm indication. The
alarm event code will continue to be recorded in the internal data log.
Low Temp A
Can be Enabled or
Disabled Temperature A is reading at or below the Temp A Low Alarm setting
When disabled, there will be no visible or audible alarm indication. The
alarm event code will continue to be recorded in the internal data log.
Low Temp B
Can be Enabled or
Disabled
Temperature B is reading at or below the Temp B Low Alarm setting
When disabled, there will be no visible or audible alarm indication. The
alarm event code will continue to be recorded in the internal data log.
High Level LN2 level is at or above the High Level Alarm setting
Low Level LN2 level is at or below the Low Level Alarm setting
Liquid Usage Warning Liquid Usage rate doubles within a 24 hour period
The liquid usage warning will not be indicated on the unit either audibly or
visually. It will only be recorded in the internal data log.
Liquid Usage Alarm
Can be Enabled or
Disabled Liquid Usage increases by a factor of 5 within a 24 hour period
When this alarm is disabled, there will be no visual or audible indication at
the controller, the event code continues to log
Fill Time Fill cycle has not completed within the Maximum Fill Time setting
(Auto fill is disabled until this alarm is cleared)
Bypass Time Alarm* Hot Gas Bypass cycle has not completed within the Bypass Alarm Time
Delay setting
(Once the subsequent fill has ended, auto fill will be disabled until this
alarm is cleared)
Temp A Calibration* Temperature A is reading lower than absolute zero (-273°C / -460°F / 0 K)
Temp B Calibration* Temperature B is reading lower than absolute zero (-273°C / -460°F / 0 K)
Bypass Calibration* Bypass sensor is reading lower than absolute zero (-273°C / -460°F / 0 K)
Low Battery Backup Battery voltage has dropped below 21 VDC
Power Failure
Can be Enabled or
Disabled TEC 3000 main power has been disconnected and it has been running on
battery power for 30 minutes