Powering Up and Powering Down the System

Stop Function If a fault occurs the output stage of the servo amplifier is switched off and the Fault RA/RB contact is opened. In addition, a global error signal can be given out at one of the digital outputs (terminals X3/16 and X3/17). These signals can be used by the higher-level control to finish the current PLC cycle or to shut down the drive (with additional brake or similar.).

Instruments which are equipped with a selected "Brake" function use a special sequence for switching off the output stage.

The Stop functions are defined in EN 60204 (VDE 0113), Para. 9.2.2, 9.2.5.3.

There are three categories of Stop functions:

λCategory 0: Shut down by immediately switching off the supply of energy to the drive machinery (i.e an uncontrolled shut-down);

λCategory 1: A controlled shut-down, during which the supply of energy to the drive machinery is maintained to perform the shut-down, and where the energy supply is only interrupted when the shut-down has been completed;

λCategory 2: A controlled shut-down, where the supply of energy to the drive machinery is maintained.

Every machine must be equipped with a Stop function to Category 0. Stop functions to Categories I and/or 2 must be provided if the safety or functional requirements of the machine make this necessary.

Emergency Stop The Emergency Stop function is defined in EN 60204 (VDE 0113), Para. 9.2.5.4.

strategies

Implementation of the Emergency Stop function:

λCategory 0: The controller is switched to "disable", the electrical supply (400VAC) is disconnected.

The motor must be held by an electromagnetic holding device (brake).

In multiaxis systems with connected DC-link bus (intermediate circuit) the motor leads have to be disconnected by a changeover switch and short- circuited by resistors connected in a star configuration.

λCategory 1: If hazardous conditions can result from an emergency stop switch- off with an unbraked run-down, then the drive can be switched off by a controlled shut-down.

Stop Category 1 permits electromotive braking with a switch-off when zero speed has been reached. Safe shut-down can be achieved, when the loss of the mains supply is not rated as a fault and the control takes over the disabling of the servo amplifier.

In the normal situation, only the supply power is switched off in a safe manner. The 24V auxiliary supply remains switched on.

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Schneider Electric 17S Series manual Strategies

17S Series specifications

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