Emergency Stop Sequence - Siemens SINUMERIK 828D Function Manual

N2: Emergency stop

11.4 Emergency stop sequence

11.4 Emergency stop sequence
After actuation of the emergency stop control element, the emergency stop device must operate in the best
possible way to prevent or minimize the danger.
"In the best possible way" means that the most favorable delay rate can be selected and the correct stop
category (defined in EN 60204) can be determined according to a risk assessment.
Emergency stop sequence in the NC
The predefined (in EN 418) sequence of internal functions implemented to obtain the emergency stop state is as
follows in the control system:
1. Part program execution is interrupted.
All machine axes are braked in the relevant axis-specific parameterized time:
MD36610 $MA_AX_EMERGENCY_STOP_TIME (time of braking ramp in event of errors)
The maximum braking ramp that can be achieved thereby, is defned by the maximum brake current of the
respective drive. The maximum brake current is achieved by setting a setpoint = 0 (fast braking).
2. Reset interface signal:
DB11 DBX6.3 (Mode group ready)
3. Set the interface signal:
DB10 DBX106.1 (Emergency stop active)
4. Alarm 3000 "emergency off" is shown.
5. After the expiry of a paramaterized delay time, the servo enables of machine axes are reset.
The setting of the delay time is programmed in machine data:
MD36620 $MA_SERVO_DISABLE_DELAY_TIME (switch­off delay servo enable)
The following setting rule must be observed: MD36620 ≥ MD36610
6. All machine axes are switched in the follow-up mode within the controller.
The machine axes are no longer in position control during this.
Emergency stop sequence at the machine
The emergency stop sequence on the machine is determined solely by the machine manufacturer.
Attention should be paid to the following points in connection to the sequence on the NC:
820
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions