EN/07.2013/58/60
Remote user mode
When the system is on, it’s possible to choose the board at which ask information.
If a CO3 user interface is connected to the master board and the SET key is pressed, the next screen will appear:
Select the board
Uxx
If an EO3 user interface is connected to the master board and the UP + SET keys are pressed, ‘Ux’ will appear.
By the UP / DOWN keys it’s possible to select the desired board and by the SET key it’s possible to confirm the choice.
In this way it’s possible to visualize the information about state, parameters, alarms, etc., refer to the selected unit.
If no key (out of the menus) is pressed for three minutes, the remote user mode will be disabled.
4.9. Condenser fan speed management
The parameters involved are the following:
With temperature probe:
• M98 CONDENSER TEMPERATURE SET POINT
• M99 CONDENSER TEMPERATURE PROPORTIONAL BAND
• M100 CONDENSER TEMPERATURE INTEGRAL TIME
With pressure probe:
• M101 CONDENSER PRESSURE SET POINT
• M102 CONDENSER PRESSURE PROPORTIONAL BAND
• M103 CONDENSER PRESSURE INTEGRAL TIME
Other parameters involved:
• M63 CP SWITCH ON DELAY COND. FAN START: pre-set = 90sec
• M110 DELAY TIME TO START PI CONTROL COND. FAN: pre-set = 180sec
• M111 MAX CONDENSER FAN SPEED : pre-set = 100%
• M158 ENABLE DANFOSS COMPRESSOR: pre-set = NO
The condenser fan speed control is available and it’s a proportional-integral (PI) one.
The condenser fan is under the PI control after a time equal to parameter M110 from its start.
When the compressor has to be switched on, the condenser fan will switch on before it. After a period of time equal to
the settable parameter M63, the compressor will switch on.
When the compressor has to be switched off, both compressor and condenser fan will switch off simultaneously.
The condenser fan starts at a fixed speed depending on external temperature, which has the following limits:
• M108 MIN EXTERNAL TEMP. FOR COND. FAN SPEED: pre-set = -15°C
• M109 MAX EXTERNAL TEMP. FOR COND. FAN SPEED: pre-set = 30°C
The behaviour of condenser fan at its start is described below:
– TAE < M108 ---> VC = 20%
– TAE > M109 ---> VC = M111
– M108 < TAE < M109 ---> VC is proportional
After 20 sec from the start of the machine, the fan speed will be under PI control.
The max fan speed under PI control is limited by parameter M111.
When parameter M158 is set to YES, the condenser fan is switched off only when the Danfoss compressor is effectively
off.
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