VWR VWRC0386A, Instruction Manual

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5-4 Chest Freezer VWR International
Section 5
Alarms
Error
(cont.)
High End Message Notes
Er02 “CNT PRB FLT”
Name: Control (Cabinet) Sensor Failure
Description: This condition indicates that the control sensor has failed to produce a valid reading for >12
consecutive reads (~60 seconds).
Response: The unit will stage both compressors on (if necessary) and the unit will attempt to head to bot-
tom out. If the sensor recovers, the system will begin to operate normally and respond to the temperature
feedback. The remote alarm contacts will become active regardless of the key position for this mode of fail-
ure. ‘Er02’ will be added to the main display queue and the last valid cabinet temperature value will not be
displayed
Er03 “HSHX PRB FLT”
Name: Heat Exchange Sensor Failure
Description: This condition indicates that the heat exchange sensor has failed to produce a valid reading
for >12 consecutive reads (~60 seconds).
Response: The display will show “Er03” only when the button sequence to read the heat exchange sensor
is depressed.
Er05 N/A
Name: Display Firmware Integrity Failure
Description: The display firmware has failed to pass its CRC CCITT checksum integrity test.
Response: The display performs this check at startup and the display board will fail to startup with out any
error indication if it does not pass this at power on.
Er06 N/A
Name: Micro Firmware Integrity Failure
Description: The micro firmware has failed to pass its CRC CCITT checksum integrity test.
Response: This is checked at power on reset and the “Er06” will be displayed for ~10 seconds at startup if
this condition exists.
Er07 “MICRO FAIL”
Name: Micro Fail - CS5521 SPI Failure / UISR Failure
Description: This condition indicates a micro board failure due to either the SPI bus is unable to communi-
cate with the ADC device or a UISR event caused the microcontroller to be in an unstable state.
Response: The unit will try to recover from this fault three times by a hardware reset of the micro board. In
the event that the system couldn’t rectify the issue, the following sequence of events will occur:
1. Remote alarm contacts will become active.
2. Buzzer will annunciate audibly and will have a ringback of 15 minutes.
3. “Seven segment” display will show “Er07”.
4. The system will have 10 minute staging between the high stage compressor and the low stage
compressor activation.
5. The system will go to bottom out temperatures.