Setting The Electronic Controller - Danfoss Optyma iCO2 Instructions Manual

Instructions
9 – Setting the electronic controller
Following explanation refer to the overall control. Initial settings required at the test run are described on Page 35, 10.1 Checking before turning on the
power supply".
9.1 Control items
This condensing unit has the following control functions.
Category
Start Control at start
Calculation frequency control
Fan control
Ordinary
operation control
Medium pressure control
Inching prevention control
Auxiliary control Subcooling degree suppression control
High pressure protective control
Overcurrent protective control
Protective control
(*)
Discharge temperature overheat prevention
Oil return control
Electronic expansion valve for middle pressure
receiver inlet
Control valves Electronic expansion valve for liquid bypass
Electronic expansion valve for subcooling coil
At inverter error Inverter error control
Frequency changing speed change/stop
Demand control
control
(*) Protective control initiates an extraordinary operation in order to protect the product when it is expected that it may run out the allowable ranges for the
refrigeration cycle devices and electro/electronic parts. Once it reverts, as a result of control, to a state that it can operate within the allowable range, the
control function is released and it returns to ordinary operation.
24 | AN405821998738en-000102 - 118A5495A
Control name
Bypasses the start step at the starting.
Changes the operation frequency of condensing unit based on the low pressure (LP).
Controls the gas cooler fan speed aiming to achieve the high pressure being
determined by ambient temperature.
Controls the aperture of medium pressure receiver inlet electronic expansion valve
to make constant the medium pressure being determined by ambient temperature
and setting evaporation temperature.
Operation immediately after a stop is inhibited to reduce the numbers of starts and
stops.
Controls the aperture of subcooling electronic expansion valve, when it exceeds the
upper and lower limit values of subcooling degree.
Reduces the operation frequency when the high pressure (HP) is too higher.
Reduces the operation frequency when the current value is too higher.
It controls the liquid bypass electronic solenoid valve and reduces the operation
frequency further, when the discharge temperature (Td) is too higher.
Controls such that condensing unit oil will return to the compressor.
Controls the aperture of electronic expansion valve to make constant the medium
pressure.
Lowers the discharge temperature by controlling the aperture of electronic solenoid
valve, when the discharge temperature (Td) is too higher.
Controls the aperture of electronic expansion valve to maintain the supercool coil
overheat degree constantly.
Control when the inverter PCB detects an error
Lowers the maximum speed of operation frequency.
© Danfoss | Climate Solutions | 2023.02 | LCA012A024
Description