Nidec Digitax ST Series Installation Manual

Nidec Digitax ST Series Installation Manual Manual pdf 25 page image

Digitax ST Installation Guide 25Issue: 7Safety Information Introduction Mechanical Installation Electrical Installation UL Listing Information4 Electrical InstallationMany cable management features have been incorporated into the product andaccessories, this chapter shows how to optimize them. Key features include:• Internal EMC filter• EMC compliance with shielding / grounding accessories• Product rating, fusing and cabling informationElectric shock riskThe voltages present in the following locations can cause severe electric shock andmay be lethal:• AC supply cables and connections• DC and brake cables, and connections• Output cables and connections• Many internal parts of the drive, and external option unitsUnless otherwise indicated, control terminals are single insulated and must not be touched.WARNINGIsolation deviceThe AC supply must be disconnected from the drive using an approved isolation devicebefore any cover is removed from the drive or before any servicing work is performed.WARNINGSTOP functionThe STOP function does not remove dangerous voltages from the drive, the motor or anyexternal option units.WARNINGSafe Torque Off functionThe Safe Torque Off function does not remove dangerous voltages from the drive, themotor or any external option units.WARNINGStored chargeThe drive contains capacitors that remain charged to a potentially lethal voltage after theAC supply has been disconnected. If the drive has been energized, the AC supply mustbe isolated at least ten minutes before work may continue.Normally, the capacitors are discharged by an internal resistor. Under certain, unusual faultconditions, it is possible that the capacitors may fail to discharge, or be prevented from beingdischarged by a voltage applied to the output terminals. If the drive has failed in a mannerthat causes the display to go blank immediately, it is possible the capacitors will not bedischarged. In this case, consult Nidec Industrial Automation or their authorized distributor.WARNINGEquipment supplied by plug and socketSpecial attention must be given if the drive is installed in equipment which is connectedto the AC supply by a plug and socket. The AC supply terminals of the drive areconnected to the internal capacitors through rectifier diodes which are not intended togive safety isolation. If the plug terminals can be touched when the plug is disconnectedfrom the socket, a means of automatically isolating the plug from the drive must be used(e.g. a latching relay).WARNING