Operation at the 87 Hz characteristic (50 Hz motors)

The V/f ratio remains the same at 87 Hz operation. However, higher power and speeds are generated which causes a higher current flow.

Do the following to set "87 Hz characteristic" operation:

• Set parameter P1-07 to star voltage (data on the motor nameplate).
• Set parameter P1-08 to delta current (data on the motor nameplate).
• Set parameter P1-09 to "87 Hz".
• Set parameter P1-10 to "(synchronous speed at nominal frequency) × (87 Hz / 50 Hz) – (slip speed at nominal frequency)".
• Select an operating mode suitable for the motor in P4-01.
• Set the cos phi in P4-05
• Start the automatic motor measurement procedure "Auto Tune" as described in chapter Auto Tune.

Example of calculating P1-10:

DRN80M4: 0.75 kW, 50 Hz

Nominal speed 1440 min^-1

P1-10 = 1500 min^-1 × (87 Hz / 50 Hz) - (1500 min^-1 - 1440 min^-1) = 2550 min^-1

INFORMATION

Set P1-01 Maximum speed according to your requirements. In 87 Hz operation, the inverter has to provide a current that is √3-times higher. For this purpose, select an inverter with a √3-times higher power rating.