EN/07.2013/58/103
The alarm will be active with a delay of M179 seconds, if there is no communication with the PLC.
It’s possible to connect the alarm to a relay and/or to associate it to “common warning” or “common alarm” relay by
I99. The reset is automatic.
In the following table the “alarm description” is shown as it will appear on the LCD during alarm condition or in the
alarm history menu.
ENGLISH ALARM PLC COMM. ERROR
• Hours of operating of fans
The parameters involved are:
– I100 SELECT RELAY HOURS OF OPERATING OF FANS ALARM: pre-set = CA
– M180 HOURS OF OPERATING OF FANS: pre-set = 50 Hour x 100
This alarm occurs when the hours of evaporator fans activity become equal to setup parameter M180.
When it’s active, the machine goes in emergency mode (the machine is turned off immediately).
It’s possible to connect the alarm to a relay and/or to associate it to “common warning” or “common alarm” relay by
I100. The reset is automatic.
In the following table the “alarm description” is shown as it will appear on the LCD during alarm condition or in the
alarm history menu.
ENGLISH ALARM HOURS OPERATING FANS
• Low pressure: when this alarm is active, the compressor is switched off.
• High pressure: when this alarm is active, the compressor is switched off.
• Fire - Smoke
The parameter involved is:
– M179 DELAY FOR PLC COMMUNICATION ERROR ALARM: pre-set = 10 Sec
This alarm is enabled only when the data point Modbus 28 is not updated by PLC to 0 for a time greater than M179.
The signal of alarm is A1 digital input. When it’s active, the freecooling damper is closed and the heater, the
compressor, the condenser fan and the evaporator fans are switched off.
• Power failure
When this alarm is active, the machine goes in emergency mode but without switching off the evaporator fans.
• Compressor thermic: when this alarm is active, the compressor is switched off.
• Suction pressure invalid: when this alarm is active, the compressor is switched off.
• Condenser pressure invalid: when this alarm is active, the compressor is switched off.
• Thermostat high temperature
The parameters involved are:
• I101 SELECT RELAY THERMOSTAT HIGH TEMPERATURE ALARM: pre-set = CA
• M179 DELAY FOR PLC COMMUNICATION ERROR ALARM: pre-set = 10 Sec
This alarm is enabled only when the data point Modbus 28 is not updated by PLC to 0 for a time greater than M179.
The signal of alarm is A3 digital input.
When it’s active and the alarm fire - smoke is not active: the freecooling damper is closed, the heater is switched off
and the compressor, the condenser fan and the evaporator fans are switched on to the maximum speed.
It’s possible to connect the alarm to a relay and/or to associate it to “common warning” or “common alarm” relay by
I101. The reset is automatic.
In the following table the “alarm description” is shown as it will appear on the LCD during alarm condition or in the
alarm history menu.
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