Nidec Digitax HD M75 Series Installation And Technical Manual

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Nidec Digitax HD M75 Series Installation And Technical Manual Manual pdf 55 page image

Safety information Product information Mechanical installation Electrical installation Multi axis system design Technical dataDigitax HD M75X Series Installation and Technical Guide 55Issue Number: 5Use 105 °C (221 °F) (UL 75 °C temp rise) PVC-insulated cable with copper conductors having a suitable voltage rating, for the following powerconnections:• AC supply (or external EMC filter) to drive.• Drive to braking resistor.Input cable sizes should generally be regarded as a minimum, since they have been selected for co-ordination with the recommended fuses.The drive power terminals are designed for a maximum cable size of 10 mm ² (8 AWG), (minimum 0.05 mm / 30 AWG). Where more than one cableper terminal is used the combined diameters should not exceed the maximum. The terminals are suitable for both solid and stranded wires.An MCB (miniature circuit breaker) may be used in place of fuses under the following conditions:• The fault-clearing capacity must be sufficient for the installation• The I ² T rating of the MCB must be less than or equal to that of the fuse rating listed above.A fuse or other protection must be included in all live connections to the AC supply.For a parallel DC bus system the maximum AC input fusing is shown in Table 4-7.Table 4-7 Maximum AC input fusingRefer to Chapter 5 Multi axis system design on page 84 for further information regarding DC bus paralleling.4.7 Output circuit and motor protectionThe output circuit has fast-acting electronic short-circuit protection which limits the fault current to typically no more than five times the rated outputcurrent, and interrupts the current in approximately 20 μs. No additional short-circuit protection devices are required.The drive provides overload protection for the motor and its cable. For this to be effective, Rated Current (05.007) must be set to suit the motorThere is also provision for the use of a motor thermistor to prevent over-heating of the motor, e.g. due to loss of cooling.4.7.1 Motor cable typesSince capacitance in the motor cable causes loading on the output of the drive, ensure the cable length does not exceed the values given in Table 4-8.Cable sizes are given for guidance only and may be changed depending on the application and the method of installation of the cables.The mounting and grouping of cables affect their current capacity, in some cases a larger cable is required to avoid excessive temperature or voltagedrop.The recommended output cable sizes assume that the motor maximum current matches that of the drive. Where a motor of reduced rating is used thecable rating may be chosen to match that of the motor. To ensure that the motor and cable are protected against overload, the drive must beprogrammed with the correct motor rated current (Pr 05.007).• Cable lengths in excess of the specified values may be used only when special techniques are adopted; refer to the supplier of the drive.ModelFuse rating Fuse rating Input cable sizeIEC class gG UL class J mm2 AWGAll 40 40 6 8Rated Current (05.007) must be set correctly to avoid a risk of fire in the event of motor overload.NOTEWARNINGNOTE