Siemens Sinumerik 840DiE sl - Page 353

01/2007
11.5 Axes and spindles
11-353
© Siemens AG 2007 All Rights Reserved
SINUMERIK 840Di sl Manual (HBIsl) -- 01/2007 Edition
The zero mark monitoring of the encoder of a machine axis checks whether
pulses were lost between two zero mark passes. Via
S MD36310: ENC_ZERO_MONITORING (zero mark monitoring)
is used to enter the number of detected zero mark errors at which the monitor-
ing is to respond.
Special feature:
A v alue of 100 will additionally disable the hardware monitoring of the encoder.
Error response
S Interrupt: ”25020 Zero mark monitoring”
and stopping the machine axes using a speed setpoint ramp whose character-
isticissetin
S MD36610: AX_EMERGENCY_STOP_TIME (Time for braking ramp when
an error occurs)
Cause of errors/error handling
S MD36300: ENC_FREQ_LIMIT [n] (encoder limit frequency) set too high.
S Encoder cable damaged.
S Encoder or encoder electronics defective.
It is possible to switch over between the two possible encoders or position mea-
suring systems of a machine axis at any time. The permissible position differ-
ence between the two position measuring systems is monitored.
S MD36500 ENC_CHANGE_TOL (Max. tolerance on position actual value
switchover)
Error response
S Interrupt: ”25100 Measuring system cannot be switched over”
The requested switchover to another encoder is not carried out.
Cause of errors/error handling
S The specified permissible tolerance is too small.
S The measuring system to which you will switch over is not referenced.
The position difference between the two encoders or position measuring sys-
tems of a machine axis is monitored with:
S MD36510 ENC_DIFF_TOL (measuring system synchronism tolerance)
Error response
S Interrupt: ”25105 Measuring systems are not synchronous”
and stopping the machine axes using a speed setpoint ramp whose character-
isticissetin
S MD36610: AX_EMERGENCY_STOP_TIME (Time for braking ramp when
an error occurs)
Encoder
zero mark
monitoring
Position tol erance
when switching
over the encoder
Continue
monitoring of the
encoder position
tolerance
11
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