The soft start controller – NK-ASSU380P12 provides an effective solution in reduction of start-up current, typically up to 70%, but still provides full startup torque for compressors and motors. Across the line starting of air-conditioner compressor or induction motors is accompanied by inrush currents up to 7-8 times higher than running current, and starting torque up to 3 times higher than running torque. The increased unnecessary torque results in sudden mechanical stress on the machine which leads to increased wear and higher service costs and reduced service life. Moreover, the high inrush current and current peaks may stress the power supply system to increased mains and generator loads which may lead to voltage dips results in breaking down of other valuable equipment or system function.

NK-ASSU380P12 is an embedded design soft start controller. It regulates the start-up voltage of the compressor/motor intelligently to effectively reduce the inrush and surge current while starting-up, thus consume much less power from the public utility network or on-site AC power supply system but still provides full startup torque for compressors and motors.

NK-ASSU380P12 effective limits the inrush current and so improves stability of the power supply and reduces transient voltage drops that may affect or break down other loads. This will eliminate the need of over dimension of the power supply system which results in reduce capital expenditure investment in power supply capacity, charge meter, circuit breaker and power wire line capacity etc..and extend the service life of
the motor or compressor effectively.

NK-ASSU380P12 is suitable for all three-phase air conditioner and heat pump and motor with horse power less than 12P.

Electrical:

1. Applicable compressor power: 380V/12P/3PH ,190V/7HP/3PH (Rated current below 24A)
2. Operating Voltage Range: 340~460VAC
3. Control voltage: 220VAC
4. Rated operational current: 24A
5. Starting current: ≤80A/2.5S (Rated operating current within 3 times)
6. Surge current resistance: 250A/20mS
7. Depletion current: ≤50mA
8. Dissipation power: ＜10VA
9. Soft start time: ≤2.5s
10. Performance period: 45 thousand hours (within rated operating temperature range)
11. Number of starts: 100 thousand times (normal environment, the interval is not less than 3 minutes)

Features:

Protection:

1. The insulation resistance between housing and chassis: > 300 M Ω.
2. Withstand voltage between housing and chassis: >3000 VAC in 1 minute.
3. Shock resistance better than 200m/s2 and 11ms.
4. Anti vibration: 10~55mm(double amplitude, 1.5mm)
5. Protection restart time interval: 180 seconds

Environment:

1. Operating temperature range: -20~+65℃
2. Flame retardation: Insulating materials have flame retardant properties
3. Relative humidity: 0—95%
4. Shock resistance: 200m/s2 11ms
5. Anti-knock: 10～55mm (double amplitude 1.5mm)
6. Rust-resisting property: Each metal component can withstand salt spray test for at least 24 hours

Typical application: