Actual Velocity Monitoring - Siemens SINUMERIK 828D Function Manual

2.2.4

Actual velocity monitoring

Function
The actual-velocity monitoring checks that the current actual velocity of a machine axis/spindle does not exceed
the configured threshold:
MD36200 $MA_AX_VELO_LIMIT (velocity-monitoring threshold)
The threshold should be 10-15% above the configured maximum velocity.
• For axes:
MD32000 $MA_MAX_AX_VELO (maximum axis velocity)
• For spindles:
MD35110 $MA_GEAR_STEP_MAX_VELO_LIMIT[n] (maximum speed of gear stage)
If you use this setting the speed will not normally exceed the velocity-monitoring threshold (exception: drive
error).
Activation
The actual-velocity monitoring is activated as soon as the active measuring system returns valid actual values
(encoder limit frequency not exceeded):
DB31, ... DBX1.5/1.6 (position measuring system 1/2)
Effectivity
The actual-velocity monitoring only operates with active position control and the following axis types:
• Linear axes
• Rotary axes
• Open loop controlled and position controlled spindles.
Fault
If the threshold is exceeded, the following alarm appears:
25030 "Axis <Axis identifier> Actual-velocity alarm limit"
The affected axis is stopped via the configured braking ramp in follow-up mode:
MD36610 $MA_AX_EMERGENCY_STOP_TIME
(Maximum time for braking ramp when an error occurs)
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
A3: Axis Monitoring, Protection Zones
2.2 Axis monitoring
93