V/f: Device-dependent reference point setting

Question:

How do you select the reference point for Lenze inverters?

What must be observed?

Answer:

We have to distinguish between two groups with different reference point selection:

Group A

Base frequency setting:

For group A, the base frequency and the rated motor voltage/base voltage must be entered into the codes/parameters provided. No calculation is required. The values must be taken from the nameplate.

8400 motec/8400 BL:

C00015 | VFC: V/f base frequency

C00090 | Rated motor voltage

i510/i550: -> Could be changed!

0x2B01:2 (PAR 302) | Base frequency

0x2B01:1 (PAR 302) | Base voltage

Examples:

230-V mains voltage:

Motor data entry:

8400 motec/8400 BL:

C00015 | VFC: V/f base frequency

C00090 | Rated motor voltage

i510/i550:

0x2B01:2 (PAR 302) | Base frequency

0x2B01:1 (PAR 302) | Base voltage

400-V mains voltage:

Motor data entry:

8400 motec/8400 BL:

C00015 | VFC: V/f base frequency

C00090 | Rated motor voltage

i510/i550:

0x2B01:2 (PAR 302) | Base frequency

0x2B01:1 (PAR 302) | Base voltage

500-V mains voltage:

Motor data entry:

8400 motec/8400 BL:

C00015 | VFC: V/f base frequency

C00090 | Rated motor voltage

i510/i550:

0x2B01:2 (PAR 302) | Base frequency

0x2B01:1 (PAR 302) | Base voltage

Group B:

Base frequency setting:

For group B, the base frequency must be calculated by means of the formula provided in the hardware manual:

The following points are important:

V_FI: Depending on the device, you must either use 400 V (3-phase) or 230 V (1-phase) to calculate the formula. This is independent of operation at a higher mains voltage, e.g. at 460 V in America.
V_{rated_MOT}: Depending on the type of interconnection, the rated voltage specified on the motor nameplate must be used to calculate the formula.
f_rated: Depending on the type of interconnection, the rated frequency specified on the motor nameplate must be used to calculate the formula.

8400 StateLine/HighLine/TopLine; 8400 protec:

C00015 | VFC: V/f base frequency -> to be calculated according to the formula

Examples:

230-V mains voltage:

200V/50-Hz motor; 1-phase inverter:

8400 StateLine/HighLine/TopLine; 8400 protec:

C00015 | VFC: V/f base frequency = 230 V/200 V * 50 Hz = 57.5 Hz

200V/60-Hz motor; 1-phase inverter:

8400 StateLine/HighLine/TopLine; 8400 protec:

C00015 | VFC: V/f base frequency = 230 V/200 V * 60 Hz = 69 Hz

400-V mains voltage:

380V/50-Hz motor; 3-phase inverter:

8400 StateLine/HighLine/TopLine; 8400 protec:

C00015 | VFC: V/f base frequency = 400 V/380 V * 50 Hz = 52.6 Hz

380V/60-Hz motor; 3-phase inverter:

8400 StateLine/HighLine/TopLine; 8400 protec:

C00015 | VFC: V/f base frequency = 400 V/380 V * 60 Hz = 63 Hz

500-V mains voltage:

380V/50-Hz motor; 3-phase inverter:

8400 StateLine/HighLine/TopLine; 8400 protec:

C00015 | VFC: V/f base frequency = 400 V/380 V * 50 Hz = 52.6 Hz

380V/60-Hz motor; 3-phase inverter:

8400 StateLine/HighLine/TopLine; 8400 protec:

C00015 | VFC: V/f base frequency = 400 V/380 V * 60 Hz = 63 Hz

480V/60-Hz motor; 3-phase inverter:

8400 StateLine/HighLine/TopLine; 8400 protec:

C00015 | VFC: V/f base frequency = 400 V/480 V * 60 Hz = 50 Hz

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