3 phase Soft Starter for induction motor AC380V 7.5-630kW

✔ For standard load and heavy load;
✔ High control precision;
✔ Main circuit: 3-in and 6-out;
✔ Standard MODBUS-RTU protocol (optional);
✔ Integrated with advanced protective function;
✔ Fireproof material;
✔ Movable panel;
✔ Easy maintenance;
✔ 4-digit display.

CMC-LX Soft Starter QUICK REFERENCE GUIDE.pdf

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Model: CMC-LX
Supply Voltage: 3phase AC 380V±15% (Standard&Internal delta wiring)
Applicable motor: Ordinary squirrel cage AC asynchronous motor
Motor Power: 7.5 ~ 630kW
Application: Universal model, widely suitable for various mechanical loads. Typically used for fans, pumps, compressors, etc.

Product Description

3 phase Motor Soft Starter Services Conditions

Control power	External	AC110V-10% to AC220V+15%, 50/60Hz
	Built-in	Internal integrated control power supply, no need for external
3-phase power supply	Standard wiring AC380V ±15% Internal delta wiring AC380V±15%
Nominal current	18A~1200A, 23 rated values in total
Applicable motor	Ordinary squirrel cage AC asynchronous motor
Start mode	Voltage ramp start, current ramp start
Stop mode	Free stop, Soft stop
Protective function	Phase loss, overcurrent, SCR protection, overheating, phase current imbalance
Start frequency	Frequent or infrequent startup can be done, it is recommended that the number of startups per hour does not exceed 10 times
Logical input	Impedance 1.8 KΩ, power supply +24V
Cooling type	Natural cooling or forced air cooling
IP	IP00, IP20
Installation type	Wall mounted
Communication method	RS485（Optional）
Environmental condition	When sea altitude is above 2,000m, soft starter should be derated for use Ambient temperature: -25 ~ +45°C Relative humidity: less than 95% (20°C±5°C) Free of flammable, explosive and corrosive gas or conductive dust. Indoor installation, good ventilation, vibration less than 0.5G.

Wiring diagram for typical application

soft starter 3 phase induction motor diagram-XiChiElectric

Soft starter model Specification

CMC-***/3-LX-■

*** - Adapted Motor Power. For example, 090 means 90kW

■ - Communication method. 0 means none; 1 means RS485

Accessories shown in below table are only for reference.

**CMC-LX 380V Soft starter standard wiring specifications and accessories selection**
Adapted motor power (kW)	Model of soft starter	Rated current (A)	Model of bypass contactor	Size of primary line (copper line)
7.5	CMC-008/3-LX	18	CJX4-25	4 mm²
11	CMC-011/3-LX	24	CJX4-32	6 mm²
15	CMC-015/3-LX	30	CJX4-32	10 mm²
18.5	CMC-018/3-LX	39	CJX4-40	10 mm²
22	CMC-022/3-LX	45	CJX4-50	16 mm²
30	CMC-030/3-LX	60	CJX4-63	25 mm²
37	CMC-037/3-LX	76	CJX4-80	35 mm²
45	CMC-045/3-LX	90	CJX4-95	35 mm²
55	CMC-055/3-LX	110	CJX4-115F	35 mm²
75	CMC-075/3-LX	150	CJX4-150F	50 mm²
90	CMC-090/3-LX	180	CJX4-185F	30×4 copper bar
110	CMC-110/3-LX	218	CJX4-225F	30×4 copper bar
132	CMC-132/3-LX	260	CJX4-265F	30×4 copper bar
160	CMC-160/3-LX	320	CJX4-330F	30×4 copper bar
185	CMC-185/3-LX	370	CJX4-400F	30×4 copper bar
220	CMC-220/3-LX	440	CJX4-500F	40×5 copper bar
250	CMC-250/3-LX	500	CJX4-500F	40×5 copper bar
280	CMC-280/3-LX	560	CJX4-630F	40×5 copper bar
315	CMC-315/3-LX	630	CJX4-630F	40×5 copper bar
400	CMC-400/3-LX	780	JWCJ20-800	50×8 copper bar
470	CMC-470/3-LX	920	JWCJ20-1000	50×8 copper bar
530	CMC-530/3-LX	1000	CKJ7-1600A/1140V	50×8 copper bar
630	CMC-630/3-LX	1200	CJX4-25	50×8 copper bar

Instruction to order

To place an order, please provide product model, specification, load and application condition.

Special note:

If client needs keyboard box to be externally placed, it is necessary to order the mounting accessoriess from manufacturer. When keyboard box is externally placed, it needs to lock the mounting fittings of external keyboard box onto door panel with its hole size of 115.5(H) * 104.2(W). For specific installation steps, please refer to CMC-LX Soft Starter Quick Reference Guide V1.1.pdf.

Soft starter Working principle

Soft starter is a motor control device that integrates motor soft start, soft stop and various protection functions. It is connected in series between the power supply and the controlled motor.

When the soft starter is used to start the motor, the output voltage of the thyristor gradually increases, and the motor gradually accelerates until the thyristor is fully turned on, and the motor works on the mechanical characteristics of the rated voltage to achieve smooth starting, reduce starting current, and avoid starting overcurrent tripping.

When the motor reaches the rated speed, the start-up process ends. The soft starter automatically replaces the thyristor that has completed the task with a bypass contactor, and provides rated voltage for the normal operation of the motor to reduce the heat loss of the thyristor, prolong the service life of the soft starter, improve its working efficiency, and prevent the power grid from harmonic pollution.

The soft starter also provides a soft stop function. The soft stop is the opposite of the soft start process. The voltage gradually decreases and the speed gradually drops to zero to avoid the torque shock caused by the free stop.