Assets

EMC filter, Class A

All 7.5 kW to 90 kW inverters are supplied with an internal filter Class A.

For inverters 110 kW to 250 kW, EMC filters Class A are available. In this performance range, the EMC filters are only permitted to be used in combination with a line commutating choke.

The requirements are fulfilled using shielded cables with a max. length of 25 m.

EMC filter, Class B

Available for inverters 7.5 kW to 15 kW with an internal Class A EMC filter.

The requirements are fulfilled using shielded cables with a max. length of 25 m.

For inverters 18.5 kW to 90 kW without filters, EMC filters of Class B from Schaffner can be used.

The requirements are fulfilled using shielded cables with a max. length of 25 m to 50 m (depending on the type, details on request).

With this filter, the inverter complies with the emission standard EN 55 011, Class B for conducted interference emissions.

Leakage currents:

The leakage currents of the inverters with/without filter (internal/external) may exceed 30 mA. Typical values in practice are between 10 mA and 50 mA. The exact values depend on the design, environment and cable lengths. Interference-free operation with residual current operated devices with a trigger value of 30 mA cannot be guaranteed.

However, operation with residual current operated devices with a trigger value of 300 mA is possible. Please refer to the Instruction Manual for details.

LC filter and sinusoidal filter

The LC filter/sinusoidal filter limits the rate of rise of voltage and the capacitive charge/discharge currents which usually occur with inverter operation. This means that much longer shielded motor cables are possible when using LC filters/sinusoidal filters and the service life of the motor achieves values similar to those with direct mains operation. Use of an output choke isn't required with that.

Please note when using LC filters/sinusoidal filters:

• Only V/f, FCC control permissible
• Please observe the derating of 15 % when selecting the appropriate inverter.
• Operation only permissible with 4 kHz pulse frequency
  Note: Please observe derating for frame sizes FX and GX. 
• The output frequency is limited to 150 Hz.
• Operation and commissioning only with connected motor as the LC filter/sinusoidal filter is not idling-proof!

The LC filters/sinusoidal filters can be used for all MICROMASTER 430 inverters of frame sizes C to GX.

• Frame sizes D to F:
  The LC filters, frame sizes D to F, are designed for mounting upright in the control cabinet. Due to leakage flux lines caused by physical sources, a minimum distance of 50 mm to adjacent modules and metal parts is recommended.
• Frame sizes FX and GX:
  The sinusoidal filters, frame sizes FX and GX, are designed for mounting upright in the control cabinet. Due to leakage flux lines caused by physical sources, a minimum distance of 100 mm to adjacent modules and metal parts is recommended.

Line commutating choke

Line commutating chokes are used to smooth voltage peaks or to bridge commutating dips. In addition, line commutating chokes reduce the effects of harmonics on the inverter and the power supply. If the line impedance is < 1 %, a line commutating choke must be used in order to reduce the current peaks.

No limits are currently defined in the EN 61 000-3-2 standard for professionally used devices with a connected load > 1 kW.
This means that the inverters with an output power ≥ 0.75 kW comply with the EN 61 000-3-2 standard.

However, in accordance with the regulations of EN 61000-3-12 "Limits for harmonic currents > 16 A and ≤ 75 A per phase" an approval is necessary from the power supplier for drives that are intended to be connected to the public low-voltage network. Please refer to the Operating Instructions for the values of the harmonic currents.

Output choke

Output chokes can be supplied for reducing the capacitive compensation currents and dV/dt in the case of motor cables > 50 m (shielded) or > 100 m (unshielded). For max. permissible cable lengths, see Technical Data.

Gland plate

Gland plates are available for inverters of frame size C. All the other frame sizes have the shield connection for the control cable integrated in the inverter.

The shield for the power cable has to be connected externally (e.g. in the control cabinet). Exception: Inverters of frame sizes D and E and frame size F with integrated class A filter. In this case the shield connection is integrated in the inverter.

The gland plate facilitates the shield connection of power and control cables and thus ensures optimum EMC performance.

Selection and ordering data

The options listed here (filters, chokes, gland plates, fuses and circuit‑breakers) must be selected to match the corresponding inverter type. The inverter and the associated options have the same voltage ratings. Either fuses or circuit‑breakers may be used as listed in MICROMASTER Getting Started. Fuses type 3NA and circuit‑breakers type 3RV/3VL provide short circuit protection to the inverter supply. Fuses type 3NE1 provide short circuit protection to the inverter supply and are semiconductor protection devices.

Notes for use in America: filters, chokes and gland plates are UL‑listed accessories. FS A‑C inverters require UL‑listed fuses e.g. Class J or semiconductor fuses type 3NE1 (UL recognize UR). Type E motor controller (type 3RV) may also be used. FS D‑GX inverters require semiconductor fuses type 3NE1.

For further information about the use in Europe and America please refer to the MICROMASTER Getting Started https://support.industry. siemens.com/cs/document/ 109475764