Parameter Groups
‑208‑
0: Direct startup
1: Flying start
2: Vector pre‑excitation startup (asynchronous motor)
Description
0: Direct start
This mode is applicable to most loads. Startup with the startup frequency is
applicable to load hoisting applications such as elevators and cranes.
1: Flying start
In some applications, the motor rotates before the AC drive is started. With this
setting, the AC drive can automatically follow the motor speed and direction,
which realizes smooth startup of the spinning motor without impact. For
example, during the operation of the AC drive, due to the instantaneous power
failure of the power grid, the AC drive is powered down and restarted. Due to
inertia, the motor is in a rotating state. In this case, to recover control on the
asynchronous motor, the AC drive must detect the current speed of the motor to
avoid overcurrent, overvoltage, and even burn‑out of the power transistor of the
AC drive.
2: Pre‑excitation start (asynchronous motor)
This mode applies only to asynchronous motors in SVC or FVC mode. Performing
pre‑excitation on the motor before start improves the responsiveness of the
motor and reduces the starting current. The time sequence of the pre‑excitation
start is the same as that of the DC braking restart.
F6-01
Flying start mode
Address:
0xF601
Min.:
0
Unit:
‑
Max.: 3 Data type: UInt16
Default:
0
Change:
At stop
Value Range:
0: From stop frequency
1: From 50 Hz
2: From the maximum frequency
3: Reserved
Description
In different modes, the initial frequency of flying start is different upon restart.
The motor running direction cannot be searched upon flying start. Therefore, the
motor running direction in the current startup command must be the same as
that upon the previous motor stop. If the direction is different, the flying start
fails.
The search mode from the stop frequency is to search for a speed of 0 Hz from the
previous stop frequency. If an external force drives the motor to a higher speed
than the stop speed, this mode is not applicable.
To Next Page
Loading...
