Functions
8.17 Flying restart
Control Units CU240S
8-96 Operating Instructions, 11/2006, A5E00766042B AA
8.17 Flying restart
Data
P1200
P1202, P1203
Parameter range:
r1204, r1205
Warnings: -
Faults: -
Function chart number: -
Description
The "Flying restart" function (this is enabled using P1200) allows the inverter to be switched
to a motor which is still spinning. If the inverter was to be powered-up without using the flying
restart function, there would be a high possibility that a fault with overcurrent F0001 would
occur. The reason for this is that the flux must first be established in the motor and the V/f
control or closed-loop Vector control must be set corresponding to the actual motor speed.
The inverter frequency is synchronized with the motor frequency using the flying restart
function.
When the inverter is normally powered-up it is assumed that the motor is stationary and the
inverter accelerates the motor from a standstill and the speed is ramped-up to the setpoint
which has been entered. However, in many cases this condition is not fulfilled. A fan motor is
a typical example. When the inverter is powered-down the air flowing through the fan can
cause it to rotate in any direction.
Table 8-30 Settings for parameter P1200
P1200 Flying restart active Search direction
0 Disabled -
1 Always Start in the direction of the setpoint
2 For line supply on and fault Start in the direction of the setpoint
3 For fault and OFF2 Start in the direction of the setpoint
4 Always Only in the direction of the setpoint
5 For line supply on, fault and OFF2 Only in the direction of the setpoint
6 For fault and OFF2 Only in the direction of the setpoint
To Next Page
Loading...
Need help?
General
