SJR3 LN Series

Product Description

The L series soft starter is a soft starter developed by our company based on the latest product architecture platform(development code"Leopard")that supports multiple bypass types.

Compared with the platform of the previous generation SJR2 series, the "Leopard" architecture has been greatly optimized and improved in software and hardware.

Based on the latest 32-bit ARM architecture main control chip, the algorithm performance and functions are further improved.

The high-frequency optocoupler-triggered thyristor design replaces the traditional analog pulse drive which effectively improves the internal conduction efficiency ofthe thyristor and reduces loss. The built-in power supply design enables the product to adapt to wide voltage fluctuations.

The product also has linear temperature detection adjustable three-phase unbalance tolerance and overload tolerance design, so that it can better adapt to the harsh production environment.

Technical Reference

Model Interpretation

Protection and Operation Functions

• Soft start overheat protection
• Input phase loss protection
• Output phase loss protection
• Three-phase unbalance protection
• Starting overcurrent protection
• Run overload protection
• Low Power supply voltage protection
• Power over voltage protection
• Underload protection (anti-dry burning)
• Current limit mode start
• Voltage ramp start
• Soft stop
• Coast to stop
• Programmable relay output
• Fault relay output
• 4~20mA DC analog output
• RS485 communication I/0
• User password and run lock

Product Model

1: Based on bypass type, the above table is applicable for model LN, LE, LB and LX, but not for LD. Please refer to the model descriptions for more details.

2: The above values are given when the maximum ambient temperature of 40°C and the operating environment below 1000m above sea level. The design rated derating caused by high temperature and high altitude should be considered when selecting models.

3: The rated current of the adapted motor cannot exceed the maximum allowable current for Class 10 applications.

Heavy Load Applications

1: Based on bypass type, the above table is applicable for model LN, LE, LB and LX, but not for LD. Please refer to the model descriptions for more details.

2: The above values are reference values given according to the maximum ambient temperature of 40°C and the operating environment below 1000m above sea level. The design rated derating caused by high temperature and high altitude should be considered when selecting models.

3: The rated current of the adapted motor cannot exceed the maximum allowable current for Class 20 applications

Wiring Diagram

Basic wiring diagram

Standard application wiring diagram

Control Terminal Connection

Dimension

External Design

The soft starter (230-400V) is connected to the delta winding of the motor , in series with each winding.

The soft starter can be connected in series to the delta winding of the motor. They are driven by a current of 1/√3 wire current, which allows the use of underrated starters.Example: a motor of 400V-110kW, line current 195A (rated current for delta connection). The current in each winding is equal to 195/1.7, that is 114A. Select the maximum allowable current rating that is slightly larger than this current, i.e. 140A as the rating (SJR3-075 is used for standard applications).

Key Board

The advantages of on-line (without bypass)soft starters are:The external contactor is saved, the economic cost of the entire cabinet is reduced, and greatly reduces the space requirement, which is very suitable for occasions with high space requirements.

Examples of Applicable Industries

In the selection of functions, our SJR3 product line also takes into account the different needs of our customers. At the same time, we also mentioned some other series specifications, such as the LB series with built-in bypass and the LE series with external bypass, etc.

Welcome to contact us for more details with the contact information enclosed with this catalogue!