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The following condition code bits are available for the fast flying restart:
● For V/f control: r1204.14 (fast flying start activated).
● For vector control: r1205.16 (fast flying restart activated) or r1205.17 (fast flying restart
finished).
Note
Detection current must not become too small
If you have any problems with the fast flying restart it can be useful to set the search current
(p1202) to values > 30 %. Problems can occur if the drive is operated far into the field
weakening, or if it is operated with motor-side filters or long lines.
Fast flying restart with voltage measurement via VSM10
The time for the connection to a rotating induction motor can be shortened when the terminal
voltage of the motor is measured.
Settings for fast flying restart with voltage measurement:
1. Select the voltage measurement for the fast flying restart: p0247.5 = 1.
2. Activate the flying restart: p1200 > 0.
The following status bits indicate the characteristic of the flying restart:
1. For V/f control: r1204.15
2. For vector control: r1205.18, r1205.19, r1205.20
Note
Voltage amplitude must not be too small
If the measured voltage amplitude undershoots the 1 % limit of the converter rated voltage,
the flying restart with voltage measurement is deactivated and the motor speed sought.
9.3.6.2
Flying restart with an encoder
Description
The flying restart function behaves differently with V/f control and vector control:
● V/f characteristic (p1300 < 20):
Flying restart without an encoder (see Chapter "Flying restart without an encoder")
● Vector control with a speed encoder:
Since the speed is known from the start, the motor can be magnetized immediately at the
appropriate frequency. The duration of magnetization is specified in p0346. Once the
excitation build-up time has elapsed, the ramp-function generator is set to the actual
speed value and the motor ramped up to the current setpoint speed.
Converter cabinet units
Operating Instructions, 11/2017, A5E36652151A
Functions, monitoring and protective functions
9.3 Drive functions
513
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