Operating instructions

MM420 Parameter List 04/02
MICROMASTER 420 Parameter List
70 6SE6400-5BA00-0BP0
P1233 Duration of DC braking Min: 0
CStat: CUT Datatype: U16 Unit: s Def: 0
P-Group: FUNC Active: Immediately QuickComm. No Max: 250
Defines duration for which DC injection braking is to be active following an OFF1 or OFF3, command.
Setting this parameter between 1 and 250 sets the time duration (in seconds) of the DC injection starting
with the OFF1 or OFF3 command.
OFF t
OFF1/OFF3
ON
t
ON
t
 f 
DC braking
P1233
1
tt
P0347
OFF2
DC braking
OFF2
OFF t
OFF1/OFF3
ON
t
ON
t
DC braking
P1233
2
t
OFF2
t
t
P0347
OFF2
DC braking
OFF2
 f 
Parameter P1232 still controls the level of DC injection.
Value:
P1233 = 0 :
Not active following OFF1 / OFF3.
P1233 = 1 - 250 :
Active for the specified duration.
Caution:
Frequent use of long periods of DC braking can cause the motor to overheat.
Notice:
The DC braking function causes the motor to stop rapidly by applying a DC braking current (the current
applied also holds the shaft stationary). When the DC braking signal is applied, the inverter output pulses
are blocked and the DC current not applied until the motor has been sufficiently demagnetized
(demagnetization time is calculated automatically from motor data).
The inverter will not restart if an ON-command is given during this period.
DC braking is not possible when using a synchronous motor (i.e. P0300 = 2).
Level:
2