The 17S Series SERCOS Drive Family, continued

Electrical Considerations

The Lexium 17S family of servo amplifiers is to be used on earthed three-phase industrial mains supply networks (TN-system, TT-system with earthed neutral point, not more than 5000 rms symmetrical amperes).

The Lexium drives are incompatible with the IT system because interference suppression filters are internal and connected to earth. If the user wants to connect Lexium drives to an IT system, he may:

λuse an insulation star transformer in order to re-create a local TT or TN system. This way allows the rest of the wiring to stay an IT system (only warning in case of the first fault.)

λuse a special Residual Current Circuit Breaker (RCCB) that is able to work with dc and high peak currents. This device detects unbalance of phases with regard to earth.

Warning: When the first fault occurs, the RCCB has to switch off quickly power of the drives. Set of the residual current value must be carefully done and must be started with the lowest available value (for example: 30mA.)

Following equipment of Merlin Gerin can be used:

λVigirex, model RH328AF (Reference: 50055)

λOne of these magnetic cores:

-model TA, 30mm in internal diameter (Reference: 50437)

-model PA, 50mm in internal diameter (Reference: 50438)

-model IA, 80mm in internal diameter (Reference: 50439)

If the servo amplifiers are used in residential areas, or in business or commercial premises, then additional filter measures must be implemented by the user.

The Lexium 17S family of servo amplifiers is only intended to drive specific brushless synchronous servomotors from the Lexium BPH series, with closed-loop control of torque, speed and/or position. The dielectric withstand voltage of the motors must be at least as hight as the DC-link voltage of the servo amplifier.

Use only copper wire. Wire size may be determinated from EN 60204 (or table 310- 16 of the NEC 60°C or 75°C column for AWG size).

We only guarantee the conformance of the servo amplifiers with the standards for industrial areas, if the components (motors, cables, amplifiers etc) are delivered by Schneider Automation.

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Schneider Electric 17S Series manual Electrical Considerations

17S Series specifications

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