Issue 01/06 | Parameter Description |
3.27Dynamic braking
P1237 | Dynamic braking |
|
| Min: | 0 | |
| CStat: | CUT | Datatype: U16 | Unit: - | Def: | 0 |
| FUNC | Active: Immediately | QuickComm.: No | Max: | 5 |
Level
2
Dynamic braking absorbs the braking energy. This parameter activates the function "Dynamic braking" and defines the rated duty cycle of the braking resistor (chopper resistor). Dynamic braking is active when the function is enabled and
If a motor is quickly ramped down by the inverter or a big load is dropped by a lifting application, the motor works in regenerating mode and saves energy back to the inverter. In this case the
Dynamic braking
If P1254 = 0 :
VDC, Chopper = 1.13 ⋅ 2 ⋅ Vmains = 1.13 ⋅ 2 ⋅ P0210
otherwise :
VDC, Chopper = 0.98 ⋅ r1242
Possible Settings:
0Disabled
15 % duty cycle
210 % duty cycle
320 % duty cycle
450 % duty cycle
5100 % duty cycle
Dependency:
This function is not available for for MM440 PX (FSFX and FSGX).
If used with DC braking enabled as well compound braking will take priority.
DC braking P1233 > 0
?
yes
DC braking enabled
no Compound no
braking P1236 > 0
?
yes
Compound braking
enabled
Dynamic no braking
P1237 > 0
?
yes
Dynamic braking enabled
disabled
Notice:
Initially the brake will operate at a high duty cycle dependant on the DC link level until the thermal limit is approached. The duty cycle specified by this parameter will then be imposed. The resistor should be able to operate at this level indefinitely without overheating.
Chopper resistor
MM4
B+ |
B-
~
=
Chopper control
=
~
~
MICROMASTER 440 | Parameter List |
147 |