Flying Restart - Siemens SINAMICS S150 NEMA Operating Instructions Manual

Converter cabinet units

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Table of Contents

Functions, monitoring and protective functions

9.3 Drive functions

Faults without automatic restart (p1206)

Up to 10 fault numbers for which the automatic restart should not be effective can be

selected via p1206[0...9].

The parameter is only effective if p1210 = 6 and p1210 = 16.

• p1206[0...9]

To prevent the motor from switching to phase opposition when the drive is being restarted,

there is a delay while the motor demagnetizes (t = 2.3 x motor magnetization time constant).

Once this time has elapsed, the inverter is enabled and the motor is supplied with power.

Flying restart

The "Flying restart" function (enabled via p1200) allows the converter to switch to a motor

that is still rotating. Switching on the converter without the flying restart function would not

allow any flux to build up in the motor while it is rotating. Since the motor cannot generate

any torque without flux, this can cause it to switch off due to overcurrent (F07801).

The flying restart function first determines the speed of the drive with which V/f or vector

control is initialized. so that the converter and motor frequency can be synchronized.

During the standard start-up procedure for the converter, the motor must be at a standstill.

The converter then accelerates the motor to the setpoint speed. In many cases, however,

the motor is not at a standstill.

Faults without automatic restart

Automatic restart mode

Automatic restart, start attempts

Automatic restart, delay time start attempts

Automatic restart monitoring time

Automatic restart status

Operating Instructions, 12/2018, A5E36652151A

Enclosed Drives