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Technical Description
2.14.1
Stop function to EN 60204 (VDE 0113)
If a fault occurs (ð p.62) 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.).
Instruments which are equipped with a selected "Brake" function use a special sequence for
switching off the output stage (ð p.21).
The -AS- option can be used to switch off the drive via a positive-action (approved by the Trade
Liability Association) safety relay, so that personnel safety is ensured at the drive shaft (ð p.65).
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
necessary.
You can find additional information and implementation examples in our application note "Stop and
Emergency Stop functions".
2.14.2
Emergency Stop strategies
The Emergency Stop function is defined in EN 60204 (VDE 0113), Para. 9.2.5.4.
Implementation of the Emergency Stop function :
You can find wiring recommendations in our application note
Category 0:
Category 1:
24
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.
"Stop and Emergency Stop functions"
The controller is switched to "disable", the electrical supply (400VAC) is disconnected.
The drive must be held by an electromagnetic holding device (brake).
In multiaxis systems with connected DC bus link bus (intermediate circuit) the motor leads
have to be disconnected by a changeover switch (contactor, e.g. Siemens 3RT1516-1BB40)
and short-circuited by resistors connected in a star configuration.
If hazardous conditions can result from an emergency stop switch-off with an unbraked
run-down, then the drive can be switched off by a controlled shut-down.
Stop Category 1 permits electromotive braking with a switch-off when zero speed has
been reached. Safe shut-down can be achieved, when the loss of the mains supply is not
rated as a fault and the control takes over the disabling of the servoamplifier.
In the normal situation, only the supply power is switched off in a safe manner.
The 24V auxiliary supply remains switched on.
02/06
AX2000 Installation manual
BECKHOFF
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