Parameter descriptions
7.3.4 Auto start
WARNING
Comply with VDE provision 0100 part 227 and pro-vision 0113, in particular Sections
5.4, protection against automatic
after main line voltage failure and voltage recovery,
and Section 5.5 "Undervoltage protection".
Appropriate measures must be taken to exclude any risk for staff, machines and produc-
tion goods.
In addition to that, all specific regulations relevant to the
application as well all national
directives are to be complied with.
651 Operation mode (Auto start)
The auto start function is suitable for applications which permit a start at mains voltage by their func-
tion. By activation of the auto start function via parameter
Operation mode 651, the frequency in-
verter accelerates the drive after application of the mains voltage. Control signals STOA and STOB for
enable and the start command are required as per the regulations. When the motor is switched on, it
is accelerated according to the parameterization and the reference value signal.
0 -
Off
No auto start. The drive is accelerated, after application of the mains
voltage, as soon as the enable and the start command are present
(edge-triggered). Factory setting.
1 -
Switched on
The drive is accelerated by the frequency inverter as soon as the mains
voltage is applied (level-triggered).
7.3.5 Flying Start
645 Operation Mode Flying Start
The synchronization to a rotating drive is necessary in applications which drive the motor by their
behavior or in which the drive is still rotating after an error switch-off. Via
Operation Mode Flying
Start
645, the motor speed is synchronized to the current motor speed without an "Overcurrent" fault
message. After this, the motor is accelerated to the reference speed at the set acceleration. This syn-
chronization function determines the current rotary frequency of the drive via a search run.
The synchronization in operation modes 1 to 4 is accelerated by short test impulses. Rotary frequen-
cies of up to 175 Hz are determined within 100 ms to 300 ms. For higher frequencies, a wrong fre-
quency is determined and the synchronization fails. In operation modes 1 to 4, the Flying Start cannot
determine whether a synchronization attempt has failed.
For operation of a synchronous motor, the flux direction can be determined in order to prevent align-
ment of the motor shaft (jerking) during start-up. Determining the flux direction takes approx. 20 ms.
In this process, there are short torque pulses. This method is not suitable for very dynamic drives
since the torque pulses result in a rotation of the drive and consequently in wrong measurements.
Once the flux direction was determined, the flux is formed (Parameter
Minimum flux-formation time
779, Maximum flux-formation time 780, Current during flux-formation 781) in order to improve the
starting behavior.
129
Operational Behavior 06/2013 Operating Instructions
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