July 2013 6.11 Monitoring functions 931
Internal emergency
stop
If an internal emergency stop is triggered (e.g. due to standstill monitoring),
the nominal speed value "null" is transmitted, braking the drives on the
intended braking ramp (usually at the limit of current)
the control-is-ready output is switched off (-STO.A.G on PL; responsible
watchdog reacts after 10 ms at the latest)
the inverter enabling is switched off (-STO.A.x over PWM cable; responsible
watchdog reacts after the time set in MP2172 of 1 to 60 s), and the inverters
are disconnected,
markers M4177, M4178 and M4260 are set by the NC.
Machine parameter MP2172.x serves to monitor the braking of the drives. The
monitoring time for the braking process is defined in MP2172.x. The time for
switching off the pulses (entry in MP2172.x) must be greater than the
maximum possible braking time of the axis/spindle that can occur through
electrical braking. Especially for axes/spindles without mechanical braking,
you must ensure that the pulses are not switched off until after the maximum
possible braking time for the axis/spindle that can occur through electrical
braking. Non-decelerated axes/spindles coast to a stop after pulse switch-off.
In the worst case, this can cause damage to the machine. Specific operating
conditions of the machine, such as maximum feed rate, overload on the axes,
etc., must also be taken into account.
During an internal emergency stop, an error appears on the screen. Depending
on its class (cause), it is possible that an error cannot be cleared with the CE
key:
Correct the error and restart the switch-on routine.
MP2172 Delay for the STO.A.x signal (inverter enable)
Input: 0 to 60 [s] as an integer
0 = 3 seconds (default value)
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