CMS200
Product Manual, Issue 6
www.nexo.com
Page 39
If set point is achieved within twenty (20) cycles the controller reverts to normal
operation and the controller alternately displays: d0/Temp.
An audio alarm sounds for ten (10) seconds, every ten (10) minutes.
If set point is not achieved within twenty (20) cycles the compressor switches off and
the controller displays 3BarStack: An audio alarm sounds continuously.
4.4
Temperature sensor alarms
Elstat controllers manage sensor failures as follows:
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PF1 alarms: CMS200 controllers will enter PF1 limp home mode.
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PF2 alarms: CMS200 controllers continue running the compressor and alternate the display
between PF2 and the appliance sensor temperature indicating a fault.
`
PF3 alarms: CMS200 controllers will switch off the compressor and alternate the display
between PF3 and dEF indicating a fault for the duration of defrost cycles.
Note: Sensor faults may also be identified by using the input test within the test routines (tSt).
4.5
Appliance sensor failure alarms
The limp home aspect of this alarm ensures that the cooler continues to operate with limited disruption to
the end user. The cooler will operate, cooling the products, while a service engineer visit is scheduled. The
table below describes how the CMS200 controls the cooler during this time and what the end user will see:
Audio alarm
Display
Audible alarm sounds five times every compressor cycle (compressor switches ON or
OFF) - if the buzzer is enabled
While the above is displayed, the controller is managing the compressor and the fans:
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The compressor cycles fifteen (15) minutes off, then five (5) minutes on.
`
The fan switches on with the compressor on cycle, then cycles when the compressor is in the
off cycle as set by the FCO (fan cycle on) and FCF (fan cycle off) parameters.
The controller will reboot when the PF1 fault is cleared or fixed.
