Hi,
We have a machine that's fairly new on site, but has been designed fairly badly from a controls perspective. One of my concerns is that the big robot picks up an 80kg sack using 2 vacuum suckers. If the machine is stopped due to a guard being broken, the robot will hold this sack high up and an operator can walk around the inside of the cell and under the sack which could be about 6 feet above them. The vacuum pump obviously stays on to hold the sack. If someone was to hit the e-stop the vacuum pump will stop and then drop the sack. If someone was inside the cell, this could obviously cause an injury.
With this case, would it be normal to not drop the supply to the pump contactor when the e-stop circuit drops out? There is a lock off isolator close to the pump, so that should cover any engineer wanting to work on it.
Thanks
We have a machine that's fairly new on site, but has been designed fairly badly from a controls perspective. One of my concerns is that the big robot picks up an 80kg sack using 2 vacuum suckers. If the machine is stopped due to a guard being broken, the robot will hold this sack high up and an operator can walk around the inside of the cell and under the sack which could be about 6 feet above them. The vacuum pump obviously stays on to hold the sack. If someone was to hit the e-stop the vacuum pump will stop and then drop the sack. If someone was inside the cell, this could obviously cause an injury.
With this case, would it be normal to not drop the supply to the pump contactor when the e-stop circuit drops out? There is a lock off isolator close to the pump, so that should cover any engineer wanting to work on it.
Thanks