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System Performance Microprocessor Controls
51 Liebert
®
Mini-Mate2
™
7.2.3 Humidification Operation
The canister humidifier is activated when the humidity control calculates a requirement of 100%
humidification; and is deactivated when the humidification requirement falls below 50%.
7.3 Load Control Features
The control system monitors the compressor and prevents it from turning on within a 3 minute period
of being off. If this on-off-on cycle occurs too often (e.g., 10 times in one hour) a Short Cycle Alarm will
occur.
7.3.1 Communications
The control system uses a two-wire, RS-422 channel to communicate with Liebert Site Products via a
proprietary protocol. A converter board (ECA2) is available to allow communications with a “dumb”
terminal or a computer using RS-232 channel. More details are provided in the Site Products and
ECA2 User Manual.
The communications channel provides both monitoring and control options, including:
• TEMPERATURE/HUMIDITY: Current temperature and humidity readings.
• STATUS (%), Cooling/heating and humidify/dehumidify operating status.
• PRESENT ALARMS: Alarms currently activated.
• SET POINTS:
• Temperature Set point
• Temperature Sensitivity
• Humidity Set point
• Humidity Sensitivity
• High Temperature Alarm
• Low Temperature Alarm
• High Humidity Alarm
• Low Humidity Alarm
• ON/OFF STATUS and CONTROL
• SILENCE ALARM