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Beckhoff
2.14
Switch-on and switch-off behavior
The diagram below illustrates the correct functional sequence for switching the servo amplifier on
and off.
DC bus link
2.14.1
Stop function to EN 60204
If a fault occurs (ð p. 70) the output stage of the servo amplifier is switched off and the BTB/RTO
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) (see online help for the setup software). 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.).
The built-in restart lock -AS- can be used to switch off the drive via a positive-action (approved by
Trade Liability Association) safety relay, so that personnel safety is ensured at the drive shaft
(ð p. 25).
Instruments which are equipped with a selected "Brake" function use a special sequence for swit-
ching off the output stage (ð p. 21).
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:
Every machine must be equipped with a Stop function to Category 0. Stop functions to Categories 1
and/or 2 must be provided if the safety or functional requirements of the machine make this neces-
sary.
You can find additional information and implementation examples in our application note "Stop and
Emergency Stop functions".
AX2040/2070 Installation Manual
Category 0:
Shut down by immediately switching off the supply of energy to the
drive machinery (i.e an uncontrolled shut-down);
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;
Category 2:
A controlled shut-down, where the supply of energy to the drive machinery
is maintained.
- A.4.038.3/01
02/06
Technical Description
23
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