Danfoss NUS100FSC Variable Speed Compressors
Litaelo tsa Tšebeliso
Compressor Overview
- Variable Speed offers the lowest energy consumption for applications by electronically self-adjusting the compressor’s speed to meet the cooling needs of the appliance, while improving the Coefficient of Performance (COP) by up to 40%.
- Commercial refrigeration manufacturers are focusing their efforts on producing more efficient applications to satisfy the demand for reduced operating costs of refrigeration equipment installed in supermarkets, retail premises, and restaurants, where energy savings have become a major concern.
- The accurate design of the application and the proper selection of components—such as efficient compressors, fan motors, increased insulation thickness of cabinet walls, larger condensers, and low-consumption lighting—are key to reducing the total energy consumption of the application. The compressor is one of the components with the highest impact in terms of energy consumption in an appliance.
- Variable Speed Compressors are the solution for obtaining maximum energy reduction, primarily because full compressor capacity is not always needed. This technology dynamically adapts the compressor’s cooling capacity to the appliance’s needs by adopting electronically controlled running speed, optimizing the system’s performance.
The benefits obtained by using Variable Speed Compressors include:
- The ability to cover several standard compressor models of different cabinet volumes with just one compressor model.
- Reduction in compressor power consumption by up to 45% to 50% compared to standard compressors. This energy saving can be over 40% when considering the total appliance power consumption (attributable solely to the compressor).
- Reduction in pull-down time by operating at a higher speed when needed.
- Reduction in the number of start-ups/stops of the compressor.
- Modification of speed to achieve the longest possible duty cycle.
- Lower noise levels.
- Longer expected compressor life due to the compressor typically running at a lower speed than standard compressors.
- Drop-in electronic driver system for automatically self-adapting the compressor speed to the current thermal load.
- Compatibility with electromechanical and electronic thermostats.
Compressor dimensional drawings
Lihokelo
- Ho hula
- Tshebeletso
- Hlakola
Compressor performances
Table 1: Cooling Capacity [W] ASHRAE
Enfelopo e sebetsang
R290 LMBP
Mokhanni oa elektroniki
The controller N112xx drives the compressor at different specific speeds in order to better match the cooling needs of the refrigeration appliance.
There are different inverter type depends on power supply type and control signal , as shown in table .
| N212FM-B07 | Tlhaloso: NUS100FSC | LMBP | 2000 ÷ 4500 rpm | 160-264V 50/60Hz | Khafetsa |
| N212FM-C07 | Tlhaloso: NUS100FSC | LMBP | 2000 ÷ 4500 rpm | 160-264V 50/60Hz | Ho kena |
| N212FR-B07 | Tlhaloso: NUS100FSC | LMBP | 2000 ÷ 4500 rpm | 90-140V 50/60Hz | Khafetsa |
| N212FR-C07 | Tlhaloso: NUS100FSC | LMBP | 2000 ÷ 4500 rpm | 90-140V 50/60Hz | Ho kena |
| N212FM-B08 | Tlhaloso: NUS125FSC | LMBP | 2000 ÷ 4500 rpm | 160-264V 50/60Hz | Khafetsa |
| N212FM-C08 | Tlhaloso: NUS125FSC | LMBP | 2000 ÷ 4500 rpm | 160-264V 50/60Hz | Ho kena |
| N212FR-B08 | Tlhaloso: NUS125FSC | LMBP | 2000 ÷ 4500 rpm | 90-140V 50/60Hz | Khafetsa |
| N212FR-C08 | Tlhaloso: NUS125FSC | LMBP | 2000 ÷ 4500 rpm | 90-140V 50/60Hz | Ho kena |
| N212FM-B09 | Tlhaloso: NUS160FSC | LMBP | 1800 ÷ 5000 rpm | 160-264V 50/60Hz | Khafetsa |
| N212FM-C09 | Tlhaloso: NUS160FSC | LMBP | 1800 ÷ 5000 rpm | 160-264V 50/60Hz | Ho kena |
| N212FR-B09 | Tlhaloso: NUS160FSC | LMBP | 1800 ÷ 5000 rpm | 90-140V 50/60Hz | Khafetsa |
| N212FR-C09 | Tlhaloso: NUS160FSC | LMBP | 1800 ÷ 5000 rpm | 90-140V 50/60Hz | Ho kena |
General rules and wiring connections
- The NUS series must always be powered through the dedicated electronic controller, supplied with the compressor as a separate device.
- Never connect the compressor’s hermetic pins directly to an AC or DC source.
- Do not attempt to fit an electronic driver different from the one supplied with the compressor, as the compressor will not operate and irreversible damage may occur.
- Do not remove the controller cover while powered on.
Mokhanni oa elektroniki View
Sebopeho sa terminal
- CN1 Power input terminal
- CN2 Thermostat input
- CN3 Frequency input
- CN4 Hot gas defrost input
- CN5 Compressor power output
Setšoantšo sa Wiring
External frequency steering input – wiring
Drop-in mode – wiring 
Operating modes – speed control
Drop in mode with thermostat
Under this mode of operation, the compressor speed is controlled according to the appliance’s requirements. The optimal speed is evaluated based on the speed of the previous cycle and the time the compressor has been running or stopped.
Advantages of Drop-in Control mode include:
- Reduction in compressor power consumption compared to standard compressors.
- Reduction in pull-down time by operating at a higher speed when needed.
- Reduction in the number of start-ups/stops of the compressor.
- Lower Sound Power Level due to the system typically running at a lower speed.
- The N206xx-Cxx series inverter is controlled by connecting terminal CN2 to the thermostat. The speed is determined by the controller’s rules (related to the operating rate and run time).
- Note: To ensure the signal effectively identified, the signal input CN2 should be in phase with L, and the voltage between CN2 and N should be greater than 98VAC.
- When the input power of the inverter is lower than 10VAC for more than 3 minutes, the inverter is considered to be powered off.
Drop-In Mode Operation
The following describes the detailed operation in drop-in mode: Pull-Down Mode:
- The compressor initiates operation at 3900 RPM and maintains this speed for 15 minutes.
- Following this initial period, the compressor speed increases to 4200 RPM for an additional 15 minutes.
- Subsequently, the compressor speed increases to its maximum value and remains there until the thermostat opens. There is no time limit (set within the controller) for operation at maximum speed; the compressor continues at this speed until the thermostat reacts.
First Cycle: - After the Pull-Down phase, the first stabilized cycle will operate at 3900 RPM.
Stabilized Conditions: - During the stabilized cycle, the compressor speed is automatically adjusted based on the runtime of the previous cycle. The controller calculates the new speed using the following method:
- Speed Adjustment Logic:
- If the Operating Rate exceeds 85%, the speed in the subsequent cycle will be reduced by 300 RPM.
- If the Operating Rate is below 85%, the speed in the subsequent cycle will be increased by 300 RPM.
- Examphanyane:
- Example 1
- If Tr = 10 minutes and Ts = 5 minutes, Operating Rate = 10 / (10 + 5) = 0.66 (66%).
- In this case, the compressor speed will be increased in the next cycle to achieve an 85% Operating Rate.
- Example 2
- If Tr = 40 minutes and Ts = 5 minutes, Operating Rate = 40 / (40 + 5) = 0.88 (88%).
- In this case, the compressor speed will be reduced in the next cycle to achieve an 85% Operating Rate.
- In situations requiring higher cooling capacity (e.g., cabinet door opening, introduction of a warm load, increase in ambient temperature, or modification of thermostat settings), if the thermostat does not open within 30 minutes beyond the previous operating time (Tr), the compressor will reenterPull-Down Mode until the thermostat opens.
Defrost Mekhoa
Hot-Gas Defrost
Hot-gas defrost is activated by a signal received at terminal CN4. This signal will cause the compressor to stop if the thermostat is in the ON position. The compressor will then start operating in defrost mode (at 3900 speed) after a 5-minute delay. This continues until the defrost signal is deactivated (OFF). The compressor will then stop and, after another 5-minute delay, restart at max speed e.g. 4500 RPM, following the Pull-Down routine (step 3). The next cycle after the thermostat reacts (step 4) will operate at the same speed as the last cycle before defrost activation.
Static Defrost Mode
Due to the absence of a dedicated static defrost input, static defrost can be initiated by interrupting the controller’s power supply. To terminate the defrost cycle, the power supply to the compressor’s controller must be restored. Following this, the compressor will restart in Pull-Down Mode.
Frequency control mode
Under this mode of operation, the compressor speed is controlled through a frequency signal sent to the inverter. The compressor’s speed will follow the frequency signal, according to the relation described in Table 3 and 4 and illustrated in Graph 3 and 4.
Control signal characteristics
The frequency signal is a digital square wave, and its characteristics are described in Table 5.
| Tafole 5: | ||
| Mofuta | Boleng | Yuniti |
| Mokgwa wa Letshwao | Square wave pulse | |
| Duty Cycle | 50±10 | % |
| Vol e phahamengtagboemo | 5 | VDC |
| Minimum high voltagboemo | 4 | VDC |
| Maximum high voltagboemo | 6 | VDC |
| Vol e tlasetagboemo | ≤0.5 | VDC |
| High current level | 0.003 | A |
| Maximum high current level | 0.010 | A |
| Minimum high current level | 0.002 | A |
| Maximum allowable reverse voltage | 5 | VDC |
| Control frequency signal | f0~f3 | Hz |
| Relation between Control frequency signal and Frequency(Hz)×30 rpm compressor speed | ||
Driver Protection Characteristics
The electronic driver is electronically protected against several possible malfunctions and failures. A LED light is installed on the driver board to display the intervention of any alarm and to identify its cause. The visual indication consists of a sequence of LED flashes repeating every 5 seconds until the alarm cause disappears. The code for the flashing sequence corresponding to each alarm is indicated in the following table.
- Protection Type LED status
- Over-current protection 1 ash
- Ho feta-voltage protection 2 ash
- Tlas'a voltage protection 3 ash
- Hardware Protection 4-5 ash
- Electronic board Protection 6-7 ash
- Failure during starting 8 ash
- Phase loss protection 9-11 ash
- Over-temperature protection 12 ash
- Motor speed not reached 13 ash
- Over-power protection 14 ash
Controller characteristics
Litekanyo tsa molaoli
Input and Output characteristics
Packaging and Ordering
Danfoss Commercial Compressors
ke moetsi oa lefats'e ka bophara oa li-compressor le li-unit tsa condensing bakeng sa sehatsetsi le lits'ebetso tsa HVAC. Ka mefuta e mengata ea boleng bo holimo le lihlahisoa tse ncha re thusa k'hamphani ea hau ho fumana tharollo e sebetsang hantle ea matla e hlomphang tikoloho le ho fokotsa litšenyehelo tsohle tsa potoloho ea bophelo.
Re na le boiphihlelo ba lilemo tse 40 ka har'a nts'etsopele ea li-compressor tsa hermetic tse re tlisitseng har'a baetapele ba lefats'e khoebong ea rona, mme li re behile joalo ka litsebi tse ikhethang tsa theknoloji ea lebelo le fapaneng. Kajeno re sebetsa ho tsoa litsing tsa boenjiniere le tsa tlhahiso ho pholletsa le lik'honthinente tse tharo.
Lihlahisoa tsa rona li ka fumanoa lits'ebetsong tse fapaneng tse kang marulelo a marulelo, li-chillers, li-air conditioner tsa bolulo, lipompo tsa mocheso, li-coldrooms, mabenkele a maholo, ho pholisa tanka ea lebese le mekhoa ea ho pholisa ea indasteri.
Litokomane / Lisebelisoa
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