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Bosch Rexroth IndraDyn S - MKE Project Planning Manual

Bosch Rexroth IndraDyn S - MKE Project Planning Manual

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<strong>Project</strong> <strong>Planning</strong> <strong>Manual</strong> | <strong>Rexroth</strong> <strong>MKE</strong> Synchronous Motors Electric Drivesand Controls| <strong>Bosch</strong> <strong>Rexroth</strong> AG 69/131Connection TechniqueProtective or equipotential bondingconductorThe connection of the protective conductor terminal is to be made over thepower cable in the protective conductor into the terminal box of the <strong>MKE</strong> motor.An additional connection of a protective or equipotential bonding conductor isprescribed for <strong>MKE</strong> motors according to EN 50014: 1992. All <strong>MKE</strong> motors haveto be grounded over the additional connection part (protective conductor clampon the motor flange). Protective conductor cross-section see fig. 8-2 " Additionalprotective conductor" on page 66.8.4 Dimensioning Power CableSpeed n ≥ 0.01 Hz "rotating motor"The cables' cross-sections specified and calculated in this <strong>Bosch</strong> <strong>Rexroth</strong> documentationbase upon RMS currents and the assumption of a "rotating motor".The basis for this calculation are the continuous currents at standstill which aregiven as crest values in the technical data chapter of this documentation.The relevant electric currents are related as follows:Speed n ≤ 0.01 Hz "rotating motor"I (cable)I dN(motor)Fig.8-6:relevant electric current for the dimensioning of the cableConstant current at standstill of the motor (crest value)RMS and peak values ("rotating motor")In general, it suffices to dimension according to the RMS current for a "rotatingmotor".I (cable)I dN(motor)Fig.8-7:relevant electric current for the dimensioning of the cableConstant current at standstill of the motor (crest value)RMS and peak values ("motor at stillstand")In individual cases, for applications of longer time intervals (guide values seeFig.:8-8) which require the continuous torque at standstill at speed = 0 min -1 , itis recommended to realise the cable dimensioning according to the crest values("motor at standstill") given in the Technical Data.Motor type<strong>MKE</strong>037<strong>MKE</strong>047, -098, -118Period of time10 min15 minFig.8-8:Longer-term operationThe recommended minimum cross-sections specified are to bechecked by the machine / system manufacturer for the machine- /system-specific conditions and, if necessary, corrected.8.5 Cable – Handling and Installation RecommendationsGeneralThe maximum operating time of cables largely depends on the mode of installationand environmental factors at the place of installation. Since there is agreat variety of operating conditions, the following recommendations can onlybe a help in order to provide for a faultless operation of the lines (cables) aslong as possible.

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