Clamping Monitoring - Siemens SINUMERIK 840D sl Function Manual

A3: Axis Monitoring, Protection Zones
3.2 Axis monitoring functions
3.2.2.5

Clamping monitoring

Function
For machine axes that are mechanically clamped upon completion of a positioning operation,
larger motions can result from the clamping process (> standstill tolerance). As a result,
standstill monitoring is replaced by clamping monitoring during the clamping process.
Clamping monitoring monitors the adherence to the configured clamping tolerance:
MD36050 $MA_CLAMP_POS_TOL (clamping tolerance)
Activation
The clamping monitoring is activated by the following interface signal:
DB31, ... DBX2.3 (clamping in progress) = 1
Note
The clamping monitoring is not active in "follow-up mode" (DB31, ... DBX1.4 = 1).
Error case
If the clamping tolerance is exceeded, alarm 26000 "clamping monitoring" is displayed: 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 a
fault occurs)
Automatic stop to release the clamping
If a clamped axis must be traversed again in continuous-path mode, the NC stops the path
motion for Look Ahead at the start of the motion block of the clamped axis until the clamped
axis can once again be traversed. If the clamping is released before stopping, the path motion
is not stopped.
Parameterization:
MD36052 $MA_STOP_ON_CLAMPING = 'H01' (special function for clamped axis)
Note
The NC detects whether an axis is clamped based on the "servo enable" state of the axis:
DB31, ... DBX2.1 = 0: No servo enable ⇒ axis is clamped
DB31, ... DBX2.1 = 1: Servo enable ⇒ axis is not clamped
86
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions