6.8.2 Emergency Stop: Standards
The emergency Stop function is used for the fastest possible shut-down of the machine in a dan
-
gerous situation. The Emergency Stop function can be triggered by the actions of a single person. It
must be fully functional and available at all times. The user must not have to work out how to oper
-
ate this mechanism.
The Emergency Stop function is defined by EN 60204.
In addition to the requirements for Stop, the emergency Stop must fulfil the following requirements:
l
emergency stop must have priority over all other functions and controls in all operating situa
-
tions;
l
the energy supply to any drive machinery that could cause dangerous situations must be swit
-
ched off as fast as possible, without causing any further hazards (e.g. by using mechanical lat
-
ching devices that do not require an external supply of energy, by counter-current braking in
Stop Category 1);
l
the reset must not initiate a restart.
If necessary, provision must be made for the additional connection of emergency stop devices (see
EN 60204, "Requirements for emergency stop devices").
The Emergency Stop must be effective as a stop of either Category 0 or Category 1.
The Emergency Stop Category must be determined by a risk evaluation of the machine.
Category 0
Only hard-wired, electromechanical components may be used for the Category 0 Emergency Stop
function. It must not be triggered using switching logic (hardware or software), by transferring com-
mands via a communication network, or via a data link.
The drive must be shut down using an electromechanical circuit. If the connected servo motor has
an integrated brake, this must always be controlled by an electromechanical circuit as well.
Category 1
With the Category 1 Emergency Stop function, there must be absolute certainty in terms of the
power supply for the machine drives being switched off (i.e., secured) using electromechanical com-
ponents. Additional Emergency Stop equipment may be connected. Bringing the motor to a stand-
still by interrupting the mains supply and using controlled electronic braking. The 24 V supply for the
servo amplifier must remain constant. The issue of which circuit should be used is highly dependent
on the requirements of the application at hand.
Usually a brake in a servo motor only has the function of a holding brake. To ensure an emergency
stop function, the braking torque that is required must be checked. If the holding brake fulfills the
dynamic requirements, it must be taken into acount that this application will cause increased wear.
The parameters “STOPMODE” and “ACTFAULT” must be set to 1 in order to implement the
stop categories. If necessary, change the parameters via the terminal screen of the setup
software and store the data in the EEPROM.
Examples for implementation can be found in the Product WIKI on page "Stop and Emergency Stop
Function".
SERVOSTAR
®
601...620 Instructions Manual 33
Kollmorgen
07/2010 Technical description
To Next Page
Loading...
Need help?
General
