1 Safety1.2.2.5. Risks associated with live electric parts3HAC020993-001 Revision: G24© Copyright 2004-2008 ABB. All rights reserved.1.2.2.5. Risks associated with live electric partsVoltage related risks, general• Although troubleshooting may, on occasion, have to be carried out while the powersupply is turned on, the robot must be turned off (by setting the mains switch to OFF)when repairing faults, disconnecting electric leads and disconnecting or connectingunits.• The mains supply to the robot must be connected in such a way that it can be turnedoff outside the robot’s working space.Voltage related risks, controller S4CplusA danger of high voltage is associated with the following parts:• Be aware of stored electrical energy (DC link) in the controller.• Units inside the controller, e.g. I/O modules, can be supplied with power from anexternal source.• The mains supply/mains switch• The power unit• The power supply unit for the computer system (230 VAC)• The rectifier unit (400-480 VAC and 700 VDC. Note: Capacitors!)• The drive unit (700 VDC)• The service outlets (115/230 VAC)• The power supply unit for tools, or special power supply units for the machiningprocess.• The external voltage connected to the control cabinet remains live even when the robotis disconnected from the mains.• Additional connectionsContinues on next page
