6 Assi
nin
Parameters to the Control and the PLC Pro
ram
6
03.96
6.9 Axes and spindles
6-148
Siemens AG 2000 All Rights Reserved
SINUMERIK 840D Installation and Start-Up Guide (IAD) – 04.00 Edition
6.9.19 Spindle monitoring
If the velocity falls below the value entered in MD 36060: STAND-
STILL_VELO_TOL, then the interface signal “Axis/spindle stationary” is output.
The path feed is then enabled if MD 35500:
SPIND_STOPPED_AT_IPO_START is set.
If the spindle reaches the tolerance range specified in MD 35150:
SPIND_DES_VELO_TOL, then the signal “Spindle in setpoint range” is output.
The path feed is then enabled if MD 35510:
SPIND_STOPPED_AT_IPO_START is set.
The maximum spindle speed is entered in MD 35100: SPIND_VELO_LIMIT.
The NCK limits the speed to this value. If, however, the speed is exceeded by
the speed tolerance in spite of the NCK limitation (drive fault), then the IS
“Speed limit exceeded” is output together with the alarm “22150 channel [name]
block [number] spindle [number] maximum chuck speed exceeded”.
The spindle speed is also monitored by MD 36200: AX_VELO_LIMIT and an
alarm is generated if the set value is exceeded. In position-controlled mode (e.g.
SPCON) a limitation is set within the control to 90% of the maximum speed spe-
cified by the MD or setting data (control reserve).
The maximum gear stage speed is entered in
MD 35130: GEAR_STEP_MAX_VELO_LIMIT and the minimum speed in
MD 35140: GEAR_STEP_MIN_VELO_LIMIT. The speed cannot leave this
range when the appropriate gear stage is engaged.
The function G25 S... permits a minimum spindle speed to be programmed and
function G26 S... a maximum spindle speed limitation. The limitation is active in
all operating modes. Function LIMS=... allows a spindle speed limit for G96
(constant cutting velocity) to be specified. This limitation is operative only when
G96 is active.
The maximum encoder limit frequency (MD 36300: ENC_FREQ_LIMIT) is moni-
tored. If this limit is exceeded, the synchronization is lost and the spindle func-
tionality reduced (thread, G95, G96). The position measuring systems which are
out of synchronism are automatically resynchronized as soon as the encoder
frequency drops below the value in MD36302: ENC_FREQ_LIMIT_LOW. The
encoder limit frequency value must be such that the mechanical encoder speed
limit is not exceeded or else the synchronization from high speeds will be incor-
rect.
Axis/spindle
standstill
Spindle in
set range
Maximum spindle
speed
Gear stage speed
min. / max.
Programmable
spindle speed
limitations
Max. encoder limit
frequency
08.97
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