Siemens SINUMERIK 840D sl Function Manual page 515

05.08
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Explanation
Response
Remedy
Program
continuation
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 05.2008 Edition
10.2 NCK safety alarms for SINUMERIK 840D sl
At least one axis is not safely referenced
There are two reasons for this alarm:
– the machine position of at least one of the axes monitored with SI
has not been acknowledged by the user or
– the machine position of at least one of the axes monitored with SI
has still not been verified by subsequent referencing
Even if the axis is already referenced there is no acknowledgement that
referencing has supplied the correct result. For example, incorrect re-
sults can occur if the axis was moved after the control was powered–
down – with the result that the stop position saved prior to powering–
down is no longer correct.
To ensure that this does not happen, the user must acknowledge the
displayed actual position after the first referencing process.
When the user agreement has been set for the first time, the axis must
be subsequently referenced each time that the control is booted (when
absolute encoders are used, this subsequent referencing is automati-
cally executed). This procedure is carried out to verify the stop position
saved prior to powering–down the control.
The alarm display can be set in MD $MN_SAFE_ALARM_SUP-
PRESS_LEVEL (MD<3) in such a way that incorrect referencing is dis-
played separately for each axis.
Alarm display
The SGA "axis safely referenced" is not set. SE is disabled if the safe
actual position has not yet been acknowledged by the user agreement.
If the user agreement is set, SE remains active. The safe cams are
calculated and output, but their significance is limited because referenc-
ing has not been acknowledged.
Move all of the SI axes to the known positions and change into the
"Referencing" mode. Check the positions on the machine displayed in
the user agreement screen and set the "User agreement" using the
selection/toggle key.
If the user agreement has already been set for the axis, then re–refer-
ence the axes. It is only possible to change the user agreement in the
key–operated switch position 3 or after entering a password.
The alarm is no longer displayed when the alarm cause has been re-
moved. No other operator actions are required.
Diagnostics
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