Parameter Description | Issue 01/06 |
3.26Compound braking
P1236[3] Compound braking current |
| Min: | 0 | ||
CStat: | CUT | Datatype: U16 | Unit: % | Def: | 0 |
| FUNC | Active: Immediately | QuickComm.: No | Max: | 250 |
Level
2
Defines DC level superimposed on AC waveform after exeeding
If P1254 = 0 : |
|
|
Compound braking | UDC_Com p = | 1.13 ⋅ 2 ⋅ Vm ains = 1.13 ⋅ 2 ⋅ P0210 |
otherwise : |
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|
Compound braking | UDC_Comp = | 0.98⋅ r1242 |
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
P1236 = 0
Without Compound braking
| f | | f |
| f_set | |
|
|
| f_act |
|
|
| t |
|
| i |
|
|
t
u |
P1236 > 0
With Compound braking
f_set |
f_act |
t |
i |
t
| UDC_Comp |
t | t |
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.
146 | MICROMASTER 440 Parameter List |