Siemens 440 - Manual (Page 146)

Parameter Description Issue 01/06
MICROMASTER 440 Parameter List
146 6SE6400-5BB00-0BP0
3.26 Compound braking
P1236[3] Compound braking current Min: 0
CStat: CUT Datatype: U16 Unit: % Def: 0
P-Group: FUNC Active: Immediately QuickComm.: No Max: 250
Defines DC level superimposed on AC waveform after exeeding DC-link voltage threshold of compound
braking. The value is entered in [%] relative to rated motor current (P0305).
Compound braking switch-on level P0210 2 13 . 1 V 2 1.13 U m ains
DC_Com p
⋅ ⋅ = ⋅ ⋅ =
If P1254 = 0 :
1242 r 0.98 U
DC_Comp
⋅ = Compound braking switch-on level
otherwise :
The Compound Brake is an overlay of the DC brake function with regenerative braking (effective braking at
the ramp) after OFF1 or OFF3. This enables braking with controlled motor frequency and a minimum of
energy returned to the motor. Through optimization of the ramp-down time and the compound braking an
efficient braking without additional HW components is possible.
 f

i
t
t
f_act
f_set
P1236 = 0
Without Compound braking
u
t
 f

i
t
t
f_act
f_set
P1236 > 0
With Compound braking
t
DC-link
u
DC-link
U
DC_Comp
Index:
P1236[0] : 1st. Drive data set (DDS)
P1236[1] : 2nd. Drive data set (DDS)
P1236[2] : 3rd. Drive data set (DDS)
Value:
P1236 = 0 :
Compound braking disabled.
P1236 = 1 - 250 :
Level of DC braking current defined as a [%] of rated motor current (P0305).
Dependency:
Compound braking depends on the DC link voltage only (see threshold above). It will be active with
OFF1/OFF3 and at regenerating conditions.
It is disabled, when:
-
DC braking is active
- Flying start is active
- Vector mode (SLVC, VC) is selected
Notice:
Increasing the value will generally improve braking performance; however, if you set the value too high, an
overcurrent trip may result. If used with dynamic braking enabled as well compound braking will take
priority. If used with the Vdc max controller enabled the drive behaviour whilst braking may be worsened
paticularly with high values of compound braking.
Compound braking does not function when the drive is in vector control.
Level
2