KEB COMBIVERT F5 Instruction Manual

Also see for COMBIVERT F5: INSTALLATION GUIDELINE Installation manual Instruction manual Instruction manual Installation manual

Contents

10General1.4.8 High Voltage ConnectionsAlways note inverter voltage, select appropriate over current protection devices,select disconnect device, and select proper wire size before beginning the wiringprocess. Wire the inverter according to NEC Class 1 requirements.The correct wire gauge for each size inverter can be selected from the charts onpages 12-19. The terminal tightening torque can be found for each unit in the samecharts.Always use UL listed and CSA approved wire. The wire gauge is based on themaximum fuse rating for the inverter and a minimum of 75°C insulation rating. Usecopper wire only. Use 300V rated wire with 230V systems and 600V rated wire with460V systems.To prevent coupling high frequency noise, the following wires must be spatiallyseparated from each other a minimum distance of 8 inches (20 cm)when they are laidparallel to each other :- AC supply power and motor lines not connected to inverters- motor lines connected to inverters- control and data lines ( low-voltage level < 48 V )When using EMI filters, use only the wire provided with the filter to connect the filterto the inverter. Do not add additional wire between the filter and the inverter as thiswill have a negative effect on the operation of the filter.1.4.9 Ground ConnectionsWhen working with high frequencies ( > 1kHz ) and power semiconductors it isrecommended to make all ground connections with large exposed metal surfaces inorder to minimize the ground resistance.The metal sub-plate the inverter is mounted on is regarded as the central ground pointfor the machine or the equipment. For best results use an unpainted, galvanized orplated sub-panel.An additional high frequency ground wire should be connected between the inverterand the sub-panel. Use a stranded wire (6 gauge) or a thick ground strap. This isin addition to the ground wire required by NEC.All ground connections should be kept as short as possible and as close as possibleto the ground system, sub-panels.If other components in the system exhibit problems due to high frequency distur-bances, connect an additional high frequency ground wire between them and thesub-panel.The EMI filter should be mounted to the inverter or as close as possible to the inverterand on the same sub-panel as the inverter. Good metallic surface contact to the sub-panel is required to provide adequate high frequency grounding of the filter.