power automation PA 8000 LW Series, Installation Instructions Manual, Page: 102 / 132

5.5 Wiring for machine safety
Uncontrolled operation due to improper installation and configu-
ration!
The control unit's safety relay must be properly integrated into
the CNC machine emergency stop chain. Improper wiring and
configuration of the safety relay may result in uncontrolled opera-
tion of the CNC machine and in consequence may lead to irrever-
sible personal injuries or death.
n Only operate the CNC machine if the safety relay has been prop-
erly integrated into the machine emergency stop chain.
n Only let qualified personnel (
Ä
Chapter 2.2.1 “Qualifications”
on page 14 ) set up the emergency stop chain.
n For information on safety devices integrated into the machine see
the manual supplied by the machine's manufacturer.
n If in doubt regarding the configuration, contact the manufacturers
of the control unit and the CNC machine.
For information on the safety connector's specifications and purpose
see Ä Chapter 3.7 “Safety connector” on page 75 and Ä Chapter 2.8
“Machine safety” on page 19.
5.5.1 Wiring example for 'CNC ready' relay
Injuries due to uncontrolled operation!
An inactive 'CNC Ready' signal represents a safety related situa-
tion. The "CNC Ready" relay is switched off when the PA CNC
control unit is in a situation where the axes' movements are not
controlled. As the axes may continue to move in an uncontrolled
manner, the contacts of the "CNC Ready" relay must be used to
disconnect the machine's emergency stop safety chain. All
actions necessary for safety must be executed in the same way
as when the Emergency Stop button is pushed.
n Properly integrate the 'CNC ready' relay into the machine's emer-
gency stop chain.
The contacts for 'CNC Ready' and 'Power OK' are available on con-
nector X19 (see Fig. 63).
Safety
L DANGER
Emergency Stop Interlocking
L
DANGER
PA 8000 LW CNC control unit
Installation
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