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What issues should be noted when selecting Siemens frequency converters? Many users of frequency converters find it very troublesome to choose a frequency converter. So, what issues should be noted when selecting a frequency converter?

How to choose Siemens frequency converter?

The MM4 series is Siemens' main low-end frequency converter sold in China in recent years, forming a low to high combination with its 6SE70/71 series engineering frequency converter.

MM4 has a power of less than 250KW, while 6SE70/71 can cover the range of 2.2-2300KW; MM4 focuses on simple applications and is relatively inexpensive, while 6SE70/71 focuses on high-performance and multi machine transmission solutions and is relatively expensive. Within MM4, it is further divided into MM410/420/430/440 to target multiple different market directions, reduce its configuration and costs, and enhance its competitiveness.

Differentiate by function:

MM440 belongs to the universal frequency converter series, including the MACROMASTER series of MM410420430 products, with a rated power range from 120kw to 200kw (constant torque (CT) control mode), or up to 250kw (variable torque (VT) control mode).

6SE70 belongs to large-scale transmission, with a standard device range from 2.2kw to 2300kW. The voltage ranges from 380V to 690V. There are two types of 6SE70: book type and cabinet type. However, this device has been discontinued at present.

SINAMICS is Siemens' new generation of frequency converter products, divided into two families: G (ordinary type) and S (high-performance type). Micromaster, Masterdrive and other frequency converters will eventually be unified into the SINAMICS series products.

The SINAMICS series is a new generation of frequency converters, divided into S series and G series, including:

The S series is an upgrade of the MasterDriver engineering frequency converter 6se7 series. In fact, it has already covered various driving ranges (including servo positioning).

The G series is an upgrade to the MICROMASTER standard (universal MM series) frequency converter series.

If it is an application that requires energy feedback, it is recommended that you choose from the 6SE70 or SINAMICSS series frequency converters, as they can achieve energy feedback, while other models of frequency converters cannot. However, their prices are also slightly higher than other types of frequency converters.

In terms of performance, S120》6SE70》MM440》G120。 I suggest that you consider which frequency converter to use, taking into account the cost.

What issues should be noted when selecting Siemens frequency converters? Many users of frequency converters find it very troublesome to choose a frequency converter. So, what issues should be noted when selecting a frequency converter?

1) If the frequency converter needs to operate with a long cable, measures should be taken to suppress the influence of the long cable on the ground coupling capacitance and avoid insufficient output of the frequency converter. Therefore, in this case, the capacity of the frequency converter should be increased by one level or an output reactor should be installed at the output end of the frequency converter.

2) For some special application scenarios, such as high temperature and high altitude, it may cause a reduction in the capacity of the frequency converter, and the capacity of the frequency converter needs to be increased by one gear.

3) When using a frequency converter to drive a high-speed motor, due to the low reactance of the motor, the increase in high-order harmonics leads to an increase in the output current value. Therefore, the selection of frequency converters for high-speed motors should have a capacity slightly larger than that of ordinary motors.

4) The load type of the frequency converter; For pumps such as vane pumps or volumetric pumps, special attention should be paid to the performance curve of the load, as the performance curve determines the method of application.

5) The purpose of using frequency conversion; Constant voltage control or constant current control, etc.

6) Matching problem between frequency converter and load;

I、 Current matching; The rated current of the frequency converter for a regular centrifugal pump matches the rated current of the motor. For special loads such as deep water pumps, it is necessary to refer to the motor performance parameters to determine the inverter current and overload capacity with high current.

II、 Torque matching; This situation may occur under constant torque loads or with deceleration devices.

III、 Voltage matching; The rated voltage of the frequency converter matches the rated voltage of the load.