Safety Stops; What Is An Emergency Stop - ABB FlexPLP IRPLP 220 Product Manual

1 Safety

1.5.1 What is an emergency stop?

1.5 Safety stops

1.5.1 What is an emergency stop?
Definition of emergency stop
An emergency stop is a state that overrides any other device control, disconnects
drive power from the device motors, stops all moving parts, and disconnects power
from any potentially dangerous functions controlled by the FlexPLP system.An
emergency stop state means that all power is disconnected from the device except
for the manual brake release circuits. You must perform a recovery procedure, i.e,
resetting the emergency stop button and pressing the Motors On button, in order
to return to normal operation.The FlexPLP system can be configured so that the
emergency stop results in either:
The default setting is uncontrolled stop. However, controlled stops are preferred
since they minimize extra, unnecessary wear on the device and the actions needed
to return the FlexPLP system back to production. Please consult your plant or cell
documentation to see how your FlexPLP system is configured.
Classification of stops
The safety standards that regulates automation and equipment defines categories
in which each type of stop applies:
If the stop is...
uncontrolled
controlled
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• An uncontrolled stop, immediately stopping the device actions by
disconnecting power from the motors.
• A controlled stop, stopping the device actions with power available to the
motors so that the device path can be maintained. When completed, power
is disconnected.
Note
The emergency stop function may only be used for the purpose and under the
conditions for which it is intended.
Note
The emergency stop function is intended for immediately stopping equipment
in the event of an emergency.
Note
Emergency stop should not be used for normal program stops as this causes
extra, unnecessary wear on the device.
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then it is classified as...
category 0 (zero)
category 1
Product manual - FlexPLP IRPLP 220
3HAW050041018-001 Revision: C