Electrical Warnings and Cautions

Failure to follow any of the below can result in serious injury or death, as the safety functions could be overridden.

• Never connect safety signals to a PLC that is not a safety PLC with the correct safety level. It is important to keep safety interface signals separated from the normal I/O interface signals.

• All safety-related signals shall be constructed redundantly (two independent channels).

• Keep the two independent channels separate so a single fault cannot lead to loss of the safety function.

Failure to follow any of the below can result in serious injury or death due to electrical hazards.

• Make sure all equipment not rated for water exposure remain dry. If water is allowed to enter the product, lockout-tagout all power and then contact your local Universal Robots service provider for assistance.

• Only use the original cables supplied with the robot only. Do not use the robot for applications where the cables are subject to flexing.

• Use caution when installing interface cables to the robot I/O. The metal plate in the bottom is intended for interface cables and connectors. Remove the plate before drilling holes. Make sure that all shavings are removed before reinstalling the plate. Remember to use correct gland sizes.

Disturbing signals with levels higher than those defined in the specific IEC standards can cause unexpected behaviors from the robot. Be aware of the following:

• The robot has been tested according to international IEC standards for ElectroMagnetic Compatibility (EMC). Very high signal levels or excessive exposure can damage the robot permanently. EMC problems are found to happen usually in welding processes and are normally prompted by error messages in the log. Universal Robots cannot be held responsible for any damages caused by EMC problems.

• I/O cables going from the Control Box to other machinery and factory equipment may not be longer than 30m, unless additional tests are performed.

Negative connections are referred to as Ground (GND) and are connected to the casing of the robot and the Control Box. All mentioned GND connections are only for powering and signalling. For PE (Protective Earth) use the M6-size screw connections marked with earth symbols inside the Control Box. The grounding conductor shall have at least the current rating of the highest current in the system.

Some I/Os inside the Control Box can be configured for either normal or safety-related I/O. Read and understand the complete Electrical Interface chapter.