Product manual

PIB Process Interface Board
PIB-M2001_eng.fm 43
6.11 Safety
6.11.1 Personal Safety
Moving parts which according to the EU machinery directives might cause per-
sonal injury are interlocked via the robot holding device and emergency circuit.
Such functions are manual wire feed and mechanical cleaning of the gun.
Figure 23 on page 50 shows the build-up of the PIB interlocking system.
If national regulations require that also the power source shall be interlocked, the
interlocking system can be completed by a relay opening the control circuit of the
power source.
On manual wire feed via the welding gun or the push-button of the feed unit, the
wire can be fed without holding down the holding device up to max. 6 metres per
minute. The speed will increase as long as the push-button is activated. For speeds
higher than 6 m/min the holding device must be held down. For ARCITEC/LRA
the speed is constant - 5 m/min.
Manual wire feed: Appendix 2, Possibilities and limitations.
6.11.2 Machine Safety - Collision Sensor
The PIB is designed to be used with a welding gun with collision sensor.
In normal status the sensor is to supply 24V DC to the PIB input TB6.2.
The collision sensor controls the Run Chain relay in the PIB. The relay is of the
two-pole type and is integrated in the general stop chain (G-stop) of the robot. In
normal status the relay is active.
When the collision sensor is activated the Run Chain relay opens, resulting in
opened G-stop chain, leading to quick-stop of the motion due to the fact that the
robot goes from operation mode to stand-by mode. The error message G-stop
comes up on the robot programming unit. The message remains until it has been
acknowledged by way of the OK button.
To enable putting the robot into operation again the G-stop chain must first be
closed.
If the gun has occasionally been out of position but has sprung back again, the G-
stop chain closes and the robot is fit for use again.
If the gun remains in the wrong position, for example after having collided with the
weld object, the fixture, etc., the robot must be moved in order to make the gun
spring back. On the front of the ABB wire feed units A-314 there is a spring-back
push-button (reset) for this purpose.
Reset Function
When the collision sensor is reset the PIB microprocessor activates the Run Chain
relay and closes the G-stop chain. It is then possible to put the robot into service
again, by using the robot joystick to manoeuvre the robot to make the gun spring
back, resetting the collision sensor in closed position. The reset function is auto-
matically acknowledged.