Three Phase AC380V/660V/1140V 7.5KW Smart Squirrel-Cage Asynchronous Electric Motor Thyristor Soft Starter
Three Phase AC380V/660V/1140V 7.5KW Smart Squirrel-Cage Asynchronous Electric Motor Thyristor Soft Starter is a new type start-up equipment which integrates electronic techniques, computer techniques and modern control theory. It is the new generation product to replace the conventional star-delta starter, self-coupling voltage-drop starter and magnetic control voltage-drop starter.
1. Voltage control type and current limiting type
2. Digital and single chip control
3. Human-machine interface available
4. Space saving thanks to natural cooling with small housing design
5. Protection function: over voltage, over current, over load, over heat, short circuit, lower voltage, input or output phase failure, three phase imbalance, starting time over long protection etc.
6. Customization is available for specified application and requirement
Conditions Of Usage
Item | Description |
Power Supply | Input Voltage | Three-phase 220V/380V/480V/660V AC±15% |
Frequency | 50/60Hz |
Adaptive Motor | Squirrel-cage three-phase asynchronous motor |
Starting Times | It is recommended not to exceed 20 times per hour |
Control Mode | (1) Operation panel control |
(2) Operation panel + external control |
(3) External control |
(4) External control + COM control |
(5) COM control |
Start Mode | (1) Current-limiting start |
(2) Voltage ramp start |
(3) Kick start+ current-limiting start |
(4) Kick start + voltage ramp start |
(5) Current ramp start |
(6) Voltage current-limiting double closed-loop start |
Stop Mode | (1) Soft stop |
(2) Free stop |
Protective Function | (1)Open loop protection for external instantaneous stop terminals |
(2) Over-heat protection for soft starter |
(3) Protection for too long starting time |
(4) Input lose phase protection |
(5) Output lose phase protection |
(6) Unbalanced three-phase protection |
(7) Running over current protection |
(8) Running overload protection |
(9) Protection for fault parameter setting |
(10) Incorrect wiring protection of external control stop terminals |
Environment Ambient | Ambient | Indoor with good ventilation and free from corrosive gas and conductive dust |
Altitude | Below 1000m. Need to rise the rated power when the altitude is more than 1000m |
Temperature | -30~+55°C |
Humidity | 90%RH without dew condensation |
Vibration | <0.5G |
Protection Class | IP 20 |
Cooling | Natural cooling |
Terminals
Terminal No. | Name of terminal | Description |
Main circuit | 1L1, 3L2, 5L3 | AC power input terminal | Three-phase AC power supply and bypass contactor |
2T1, 4T2, 6T3 | Soft start output terminal | Asynchronous motor |
B1, B2, B3 | Bypass Contactor | Connected to Contactor |
Control circuit | X1/1 | Analog output-(AO-) | 0~20mA or 4~20mA Output loaded impedance (150--500Ω) |
X1/2 | Analog output+(AO+) |
X1/3 | COM | Common terminal |
X1/4 | RUN | Start when X1/4 and X1/3 are short circuited |
X1/5 | STOP | Stop when X1/5 and X1/3 break |
X1/6 | Bypass output relay (K11, K12) | K11-K12 close when output is available and contact capacity AC250V/5A, DC30V/5A |
X1/7 |
X1/8 | Fault output relay (K21, K22) | K21-K22 close when output is available and contact capacity AC250V/5A, DC30V/5A |
X1/9 |
X1/10 | PE | PE |
X1/11 | L | Control power (220VAC) | AC110V--AC220V±15% 50/60Hz |
X1/12 | N |
COM interface | 1, 2 | GND | Power GND | Definition of terminal coordinates basic wiring diagram |
3, 4 | A+ | COM terminal |
5, 6 | B- |
7, 8 | +24V | Power + |
Dimension


Model | G | H | I | K | L | M | A | B | C |
NKS100-08--075 | 172 | 320 | 172 | 156 | 240 | 6 | 20 | 10 | 100 |
Maintenance
1. Dust: If too much dust, it will reduce the insulation level of the soft starter, even causes the soft starter does not work.
Brush the dust with clean and dry brush.
Remove dust with compressed air machine.
2. Condensation: If condensation, it will reduce the insulation level of soft starter, even causes the soft starter does not work.
(1) Blow it with a hair dryer or electric stove.
(2) Bring it to power distribution room for dehumidification.
3. Regularly check components' intact. Whether it can work properly.
4. Check soft starter' cooling channel, ensure they are not clogged by dirt and dust.
Before maintenance checking, it has to cut off all power in the line side of soft starter.