07-02-12-02-EN-V1215.doc / Type: 638
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1 General Information
1.1 System Description
● Special Features of the 638 Servo Drive
• The digital 638 servo drive provides for the electrical connection, rotational speed and position
control of the AC servo motor.
• All of the functions and system controls are digitally regulated, employing a
sampling rate of 105µs.
• The 638 servo drive supports the safety function ”Safe Torque Off“, STO, providing for a
definitive system shut-down, for protection against an unanticipated start-up, in accordance with
the requirements as stated in EN 13489-1, Category 3, Performance Level d and EN1037.
• The feedback generated from the braking energy is dissipated through the employment of
internal ballast resistance and when required through the employment of additional external
ballast resistance.
• The AC supply voltage can be directly connected or it can be connected through a transformer,
as required. (Important: only operated on networks which are grounded at the centre point
(TN networks)
• The servo drive additionally requires a 24 V DC control supply voltage connection.
• The built-in internal EMC filter corresponds to the requirements regarding susceptibility to
interference for industrial systems as described in EN50081-1.
• By employing various option modules, through 2 additional plug-in receptacles, it is possible
to increase the potential connections to the field bus system and/or the input/output terminals.
• Various motor feedback loop systems can be supported by employing the flexible
feedback module X300.
• Through the employment of additional 638 drives it is optionally possible to couple the DC link.
• Minimal Housing Dimension is provided through the intelligent compact design of the unit.
● Overview of Standard Digital Communication
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