Object 345Ah: Brake Control
These objects implement the possibility to control the brake directly overriding the drive logic. When the brake state is controlled by the fieldbus, the drive state (enabled, disabled, faulted) has no effect on the brake so the fieldbus is in control.
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- Applying or releasing the brake at the wrong time can be a safety hazard and can destroy your mechanic as well as drive or motor. Unexpected behavior might be possible. It is the responsibility of the customer using this mode to use this function appropriately.
When fieldbus control is disabled, the drive controls the brake as defined by existing AKD brake related parameters. When fieldbus control is enabled, the Brake Command received over the fieldbus takes effect. If the Brake Command is set to APPLY and the current state is RELEASE, the brake begins to apply.
The default value of the fieldbus control s disabled so the drive is always in control until the fieldbus is operational. It is recommended that this bit remain 0 except for special operating conditions where the fieldbus will control the brake. When fieldbus communication is lost, the drive will regain control of the brake if the fieldbus had previously taken control.
Enable Fieldbus Control | Serious Failur econdition present | Brake Command | Fieldbus Control Status | Controlled by... | Final Brake State |
---|---|---|---|---|---|
0 |
x |
x |
0 |
Drive |
Drive |
1* |
no |
0 |
1 |
Fieldbus |
Applied |
1* |
no |
1 |
1 |
Fieldbus |
Released |
x |
yes |
any |
0 |
Drive |
Drive |
1* indicates that a rising edge was seen since the last time the drive applied the brake
Index |
|
Name |
Brake Control |
Object code |
ARRAY |
Data type |
UNSIGNED16 |
Category |
optional |
Defined sub-indices
Subindex |
0 |
Name |
highest sub-index supported |
Data type |
UNSIGNED8 |
Category |
mandatory |
Access |
R/O |
PDO Mapping |
not possible |
Value Range |
2 |
Default Value |
2 |
Subindex |
1 |
Name |
Brake Control Command |
Category |
optional |
Access |
R/W |
PDO Mapping |
possible |
Value Range |
UNSIGNED16 |
Default Value |
0 |
With subindex 1 the brake is controlled. Bit definition:
Bit |
Name |
Description |
0 |
Enable fieldbus |
0 - brake is not controlled via this object |
1 |
Brake Command |
This command bit is only active, if the functionality was activated via bit 0. The function is as follows: |
Subindex |
2 |
Name |
Brake Status Response |
Category |
optional |
Access |
R/O |
PDO Mapping |
possible |
Value Range |
UNSIGNED16 |
Default Value |
0 |
With subindex 2 the brake status can be checked. Bit definition:
Bit |
Name |
Description |
0 |
Fieldbus control Status |
0 - brake control via 0x345A is disabled or not possible due to drive failure. |
1 |
Brake Status |
0 - apply the brake |
2 |
STO Status |
0 - STO is not active (drive may be enabled) |
3 |
HW Enable Status |
0 - HW enable is disabled, drive function can not be enabled |