Machine data
2.4 Axis-specific machine data
Parameter Manual
288
Operating Instructions, 08/2013, 6FC5397-8EP40-0BA0
Description:
If a rising edge of the axis-specific hardware limit switch is detected while
the axis is traversing, the axis is braked immediately.
The type of braking is determined by this machine data:
Value = 0:
Controlled braking along the acceleration ramp defined by MD32300
$MA_MAX_AX_ACCEL (axis acceleration).
Value = 1:
Rapid braking (selection of setpoint = 0) with reduction of following error.
Related to:
NC/PLC interface signal DB380x DBX1000.1 und .0 (Hardware limit switch plus
or minus)
Description: This MD defines the braking ramp time that an axis or spindle requires to
brake from maximum velocity/speed to a standstill in the event of errors
(e.g. emergency stop). At the same lead/brake acceleration, standstill is
reached correspondingly earlier from lower velocities/speeds.
Mechanically robust axes are normally stopped abruptly with speed setpoint 0;
values in the lower ms range are appropriate in these cases (default set-
ting).
However, high moving masses or limited mechanical conditions (e.g. gear load
capacity) often have to be taken into account for spindles. This means that
the MD has to be changed to set a longer braking ramp.
Notice:
• With interpolating axes or axis/spindle couplings, it cannot be ensured
that the contour or coupling will be maintained during the braking phase.
• If the time set for the braking ramp for error states is too long, the
controller enable will be removed although the axis/spindle is still mov-
ing. Depending on the drive type used and the activation of the pulse
enable, either an immediate stop with speed setpoint 0 will be initiated
or the axis/spindle will coast down without power. The time selected in
MD36610 $MA_AX_EMERGENCY_STOP_TIME should therefore be shorter than the
time in MD36620 $MA_SERVO_DISABLE_DELAY_TIME (cutout delay, controller
enable) so that the configured braking ramp can be fully active through-
out the entire braking operation.
• The braking ramp may be ineffective or not maintained if the active drive
follows its own braking ramp logic (e.g. SINAMICS).
Related to:
MD36620 $MA_SERVO_DISABLE_DELAY_TIME (cutout delay controller enable)
MD36210 $MA_CTRLOUT_LIMIT (maximum speed setpoint)
36600 BRAKE_MODE_CHOICE EXP, A05 A3,Z1
- Deceleration response on hardware limit switch BYTE PowerOn
CTEQ
-- 0 0 1 2/2
36610 AX_EMERGENCY_STOP_TIME A05, - TE3,K3,A2,A3,N2,Z1
s Maximum time for braking ramp in case of error. DOUBLE NEW CONF
-
- - 0.05 0.0 1.0e15 2/2
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