If the cooler door is opened or the motion sensor detects activity during the saving mode, EMS con-
trollers switch on the cooler lights for the remainder of the current 30-minute period, but do not
start cooling cycle.
For more information about the parameters used in saving mode:
l See "Saving temperature disable (PEr)" on page 77
l See "Saving differential (Sd)" on page 69
l See "Saving restart period (Sr)" on page 72
l See "Saving set point (SSP)" on page 68
6.9 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.
A typical saving restart period is 120 minutes.
Whist in the saving mode, 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 an ready period, the EMS controller starts to lower the product tem-
perature, as shown below.
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 a period of inactivity, saving (0) at 18:00 followed by two mon-
itor (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:
l EMS controllers always run in the ready mode for periods in the self-learning matrix that are set to 1
(monitor) or 2 (ready).
46 of 86
27 February 2014
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