Operating instructions

Functions, monitoring, and protective functions
9.3 Drive functions
Drive converter cabinet units
Operating Instructions, 10/2008, A5E00288214A
317
9.3.3 Fast magnetization for induction motors
Description
Fast magnetization for induction motors is used to reduce delay time during magnetization.
Features
● Rapid flux build-up by impressing a field-producing current at the current limit, which
considerably reduces the magnetization time.
● If the "Flying restart" function is activated, the excitation build-up time set in p0346 is still
used.
Commissioning
Parameter setting p1401.6 = 1 is necessary to activate fast magnetization.
Then magnetization is carried out with maximum current (0.9 x r0067). When the flux
setpoint is reached, the current is reduced via the smoothing p1616 (maximum 32 x
p0115[2]).
If stator resistance identification is activated (see p0621), fast magnetization is deactivated
internally and alarm A07416 displayed.
If there are conflicts in the configuration of parameter p1401, alarm A07416 is output and a
fault detection procedure is used to display the particular conflict.
Function diagram
FP 6491 Flux control configuration
FP 6722 Field weakening characteristic, Id setpoint (ASM, p0300 = 1)
FP 6723 Field weakening controller, flux controller (ASM, p0300 = 1)
Parameter
• p0320
Motor rated magnetization current/short-circuit current
• p0346
Motor excitation build-up time
• p0621
Stator resistance identification after restart
• p0640
Current limit
• p1401
Flux control configuration
• p1570
Flux setpoint
• p1573
Flux threshold value magnetization
• p1590
Flux controller P gain
• p1616
Current setpoint smoothing time