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5.2 Activity
ems controllers measure the activity tod etermine when outlets
are open. Activity is people opening the door of the cooler to get
products and people passing in front of the cooler.
• ems controllers use a door switch to detect people opening
the cooler door
• ems controllers use a motion sensor to detect people moving
in front of the cooler The motion sensor is a passive infrared
device
The diagram to the right shows the detection pattern of the
motion sensor.
5.3 Ready mode
ems controllers run in the ready
mode when outlets are open. In
the ready mode, the product is at
the correct serving temperature
and the cooler lights are on.
ems controllers ensure that the
product is at the correct serving
temperature by keepingthe
product temperature within the
range defined by setpoint (SP)
parameter and the differential (dIF)
parameter. The ems controller runs
the compressor until the set point
(SP) temperature is reached. The
compressor is then stopped until
the measured temperature reaches
the setpoint (SP) plus differential
(dIF) temperature.
During the ready mode, ems controllers display appliance sensor temperature 3.0, for example or the word USE as
defined by display (dIS) parameter.
If the ems controller displays the appliance sensor temperature, the display stability (d2) parameter can dampen the
rate of change of the displayed temperature.
For example, to filter short fluctuations in the air temperature due to the door opening, which has no affect on the
product temperature.
At the end of the ready mode, ems controllers switch to the saving mode. However, the delay to saving (dS)
parameter can delay the switch to the saving mode. The delay helps ensure that, for example, the ems controller
remains in the ready mode during periods without activity immediately prior to outlets closing for marketing
purposes.
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