Chapter 5 System Operation
890 USE 120 00 81
Powering Up and Powering Down the System, continued
Stop Function If a fault occurs the output stage of the servo amplifier is switched off and the
Fault RA/RB contact is opened. In addition, a global error signal can be given out at
one of the digital outputs (terminals X3/16 and X3/17). These signals can be used
by the higher-level control to finish the current PLC cycle or to shut down the drive
(with additional brake or similar.).
For MHDAppppA00 only: The built-in restart lock -AS- can be used to switch off the
drive via a positive action safety relay, so that personnel safety is ensured at the
drive shaft.
Instruments which are equipped with a selected "Brake" function use a special
sequence for switching off the output stage.
The Stop functions are defined in EN 60204 (VDE 0113), Para. 9.2.2, 9.2.5.3.
There are three categories of Stop functions:
l Category 0: Shut down by immediately switching off the supply of energy to the
drive machinery (i.e an uncontrolled shut-down);
l Category 1: A controlled shut-down, during which the supply of energy to the
drive machinery is maintained to perform the shut-down, and where the energy
supply is only interrupted when the shut-down has been completed;
l Category 2: A controlled shut-down, where the supply of energy to the drive
machinery is maintained.
Every machine must be equipped with a Stop function to Category 0. Stop functions
to Categories I and/or 2 must be provided if the safety or functional requirements of
the machine make this necessary.
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