Air Conditioner Bypass Soft Starter Single Phase 220VAC 7P Reducing Start Current

The soft start controller NK-ASSU220P7 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-ASSU220P7 is an embedded design air-conditioner (for single phase power system) 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-ASSU220P7 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-ASSU220P7 is a compact size, light weight cost effective soft start controller with fire proofed housing and sealed by resin make it capable to resist extreme weather and survive in harsh environment (air-conditioner outdoor unit), this makes NK-ASSU220P7 a cost effective solution with high reliability and stability.

Electrical:

1. Nominal Working Voltage: 110Vac (90~135Vac), single phase
2. Maximum continuous working voltage: 135VAC.
3. Maximum continuous working current: 18A
4. Over Current limit: 30A/1 minute
5. Maximum non-repetitive inrush current: 170A (<20 ms).
6. Maximum surge current: 120A (<350 ms).
7. Soft start-up time: 1±0.5s
8. Current consumption: 48mA (Capacitive 110VAC)
9. Power consumption: less than 15VA
10. Operation hours: better than 45,000 hours (rated working temperature)
11. Effective soft start on/off service: >100,000 times (soft start interval not less than 3 minutes)

Features:

1. Limits inrush current
2. Eliminates current surges & voltage drops
3. Extends motor/compressor service life with built-in electronic overload protective relay
4. Integral bypass contactor reduces heat generation
5. Produces smoother starts and stops by controlling torque
6. Reduces vibration and mechanical damage
7. Relieves shock and drive train stress on startup
8. Easy to wire and install and decreases equipment downtime
9. High reliability and long life

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:

Working temperature: -40 to 85 ℃.
Working Humidity: 0~95% RH (<40 ℃).

Typical application: