4.3.1.2. Normal cycling
In the beginning of each new cycle (thermostat contact closes), the compressor is turned on
at the minimum speed. The Inverter will automatically adjust the compressor speed,
increasing or decreasing the rotation according to the thermal load variation. As the thermal
load changes inside the appliance, pressures will change, and the Inverter will sense this
variation, changing the compressor speed proportionally, without the need for a temperature
sensor. Optimum speed will be targeted to minimize energy consumption. If the thermal load
remains constant for a period longer than 20 minutes, the compressor speed is increased.
Figure 25 presents the basic working of Drop-in in normal cycles.
The standard Drop-in parameters are adjusted to run several systems with different
configurations. In the case one appliance requires some adjustment on the Drop-in, its
parameters can be tuned on demand to maximize the system's performance. For
customization demands, please get in contact with your Nidec GA Application Engineer.
Figure 25 – Drop-in, normal cycling
4.3.2. Smart Drop-in
The Smart Drop-In was designed with focus on cooling capacity, but always considering good
system efficiency. This solution provides a customization tool that allows the routine to be
parameterized and adjusted for each refrigeration system.
The logic is divided in four mains parts: Pull-down, Stability Routine, Heavy Duty Routine and
Defrost Routine. The Stability, Heavy Duty and Defrost Routine begin to run in parallel after
Pull-down is completed.
4.3.2.1. First-time Pull-down
Whenever the inverter is powered up, Drop-in is set to the pull-down state, where the
compressor runs on the maximum allowed speed, generating more cooling capacity to
reduce the pull-down time. This state is kept until thermal load reach stability.
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