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6.5 How ems controllers switch between the ready and
saving mode
A key characteristic of an ems controller is the saving restart period.
The saving restart period is time allocated for the cooler to lower the product temperature to the ready mode
temperature from the saving mode temperature.
Whist in the savingmode, the ems controller must look ahead
in the self-learning matrix for a ready period by the time
defined by the saving restart period (Sr).
For example, the ems controller looks 2-hours ahead. If the ems
controller detects anready period, the ems controller starts to
lower the product temperature, as shown in the diagram to
the right.
The ems controller switches to the saving mode if there are no ready periods within the next 2-hours as defined by
the saving restart time (Sr). The ems controller ignores periods of inactivity if the time to the next active period is
less than the saving restart time.
For example, the diagram below shows aperiod of inactivity, saving (0) at 18:00 followed by two monitor (1) periods.In
this instance, the ems controller would ignore the saving (0) at 18:00 and switch to the saving mode at 19:30.
Note
ems controllers always run in the ready mode for periods in the self-learning matrixt hat are set
to 1(monitor) or 2 (ready).
In the following example matrix, the ems controller will start to cool by the saving restart period before the ready
period (2), run in the ready mode for 30-minutes, and then switch to the saving mode (assuming no delay to saving
(dS) parameter is in operation).
For more informationaboutthe parameters used:
• See ”delay to saving( dS)”
• See ”saving restart period (Sr)”
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