NCT BNC-446 Operation Manual
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BNC-446CNC LATHEOPERATION MANUALNCT Ipari Elektronikai Kft. 8/95 Date: 08.10.2015H-1148 Budapest, Fogarasi út 7.Tel.: +36 1 467 6300www.nct.hu1.3. Maintenance safety instructionsWARNING!High voltage is used to power the machine; only authorized electricians should correct anyelectrical component failure. Disconnect main power and lock in off position beforeattempting any repair. Tag disconnect switch “DO NOT START”.1. Read and understand safety instructions for machine operator before servicing thismachine.2. Know all points where high voltages are present on this machine and in electrical boxes.3. Residual voltages can exist in the electrical cabinet for a period of time after power hasbeen turned off. Check any component inside cabinet with a meter before touching.1.4. Installation precautionsTo ensure the safe operation of the NC machine, note the following during installation:1.4.1. Wiring1. Be sure to use electrical conductors with performance ratings equivalent or superior tothose described in the Maintenance Manual.2. Do not connect to the power distribution panel any power cables for devices, which cancause line noise, such as, are welders and high frequency quenching machines.3. Arrange for a qualified engineer to connect the power lines.1.4.2. GroundingUse a grounding wire with a cross section of more than 14 mm and a resistance to ground ofless than 100 ohms.This wire size should be greater than AWB (American Wire Gauge) No. 5 and SWG (BritishLegal Standard Wire Gauge) No. 6.Generally, the NC machine should be ground to a separate grounding rod. If an independentground cannot be provided for the machine, prepare the ground connection as follow:1. Connect a single conductor to its own grounding terminal. This will avoid possibleserious accidents resulting from ground currents, maybe, which otherwise flow in the NCmachine if a peripheral device, ought to malfunction.2. Be careful when using concrete reinforcing rods as grounding points. These reinforcingrods often are used to ground equipment because they usually offer a resistance to groundof less than 100 ohms. In doing so, make the connections as follow:A. Do not use the same grounding-reinforcing rod or grounding terminal for otherdevices since this could lead to line noise such as produced electric welders and highfrequency quenching machine.B. Use a grounding terminal with an adequate electrical performance rating and which isdurable.3. A separate grounding wire should be used, one whose length is as short as possible.4. Check the resistance to ground by actual measurement. This should measure less than 100ohms if the single device is connected to its own grounding rod. |
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