4.3. Drop-in control mode
The Drop-In mode (not applicable for CF0xFx3) is a control mode of Embraco compressors,
where single thermostat contact is used to set the compressor running conditions. Drop-In
mode allows the VCC application to any refrigeration system with a simple ON/OFF
thermostat, without needing a rotation control signal through serial or frequency
communication. In the Drop-in mode, the compressor speed is adjusted automatically by the
Inverter, according to the cooling capacity required by the system.
This solution was designed to focus on efficiency. The control logic is divided into two main
parts: when the compressor is energized for the first time (pull-down) and when the
compressor is cycling (after the thermostat has switched off the compressor the first time).
4.3.1. Standard Drop-in
4.3.1.1. First-time Pull-down
Once the Inverter is energized for the first time and the thermostat contact closes, the
Inverter starts the Pull Down routine. The compressor is turned on at an intermediary speed
for 7 minutes. The speed is then increased to its maximum and kept until the thermostat
opens, switching the compressor off.
Figure 24 – Example of a pull-down cycle for an FMS compressor
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