SEWControl Cabinet Inverter MOVITRAC® B Functional Safety

1.1 About this manual

The manual is part of the product and contains important information about installation,

startup, operation and service. The manual is written for everyone installing, starting up

or servicing this product.

The manual must be accessible and legible. Make sure that persons responsible for the

system and its operation, as well as persons who work independently on the unit, have

read through the manual carefully and understood it. If you are unclear about any of the

information in this documentation, or if you require further information, contact SEWEURODRIVE.

1.2 Structure of the safety notes

The safety notes in this manual are designed as follows:

1.3 Rights to claim under limited warranty

A requirement of fault-free operation and fulfillment of any rights to claim under limited

warranty is that you adhere to the information in the MOVITRAC® B documentation.

Therefore, read the operating instructions before you start working with the unit.

Make sure that the documentation is available to persons responsible for the system and

its operation as well as to persons who work independently on the unit. You must also

ensure that the documentation is legible.

1.4 Exclusion of liability

You must comply with the information contained in the MOVITRAC® B documentation

to ensure safe operation of MOVITRAC® B and to achieve the specified product characteristics and performance requirements. SEW-EURODRIVE assumes no liability for

injury to persons or damage to equipment or property resulting from non-observance of

the documentation. In such cases, any liability for defects is excluded.

1.5 Copyright notice

© 2009 – SEW-EURODRIVE. All rights reserved.

Unauthorized duplication, modification, distribution or any other use of the whole or any

part of this documentation is strictly prohibited.

1.6 Content of this publication

This publication contains conditions and amendments related to MOVITRAC® B in

safety-oriented applications.

The system comprises a frequency inverter with asynchronous motor and safety-tested

external disconnecting device.

1.7 Other applicable publications

This document supplements the MOVITRAC® B operating instructions and limits the

application notes according to the following information.

It can only be used in conjunction with the following publications: 

• The MOVITRAC® B operating instructions must always be observed.

For permitted connection variants, refer to chapter "Connection variants" (see page 17).

Safety Concept

• In case of danger, any potential risk related to a machine must be eliminated as

quickly as possible. Standstill with restart prevention is generally the safe condition

for preventing dangerous movements. 

• MOVITRAC® B is characterized by the optional connection of X17 to an external failsafe, prototype tested safety relay. The safety relay disconnects all active elements

(disconnection of the safety oriented 24 V power supply of the output stage control)

that generate the pulse trains to the power output stage (IGBT) when a connected

control device (E-STOP button with latching function) is activated. 

• Disconnecting the 24 V voltage supply at connector X17 ensures that the supply

voltages required for operating the frequency inverter and consequently for

generating a rotating field of pulse patterns (which allow the generation of a rotating

field) are safely interrupted, preventing automatic restart.

• Instead of separating the drive galvanically from the power supply using contactors

or switches, the disconnection procedure described here prevents the power

semiconductors in the frequency inverter from being activated, thus ensuring safe

disconnection. This process disconnects the rotating field generation for the

respective motor. The individual motor cannot develop any torque in this state even

though the mains voltage is still present.

• The requirements for the safety control are clearly defined in the following sections

and must be observed.

Using a suitable external circuit via a safety control

– with approval to at least EN 954-1 category 3

enables operation of the MOVITRAC® B frequency inverter with safe disconnection to stop category 0 or 1 according to EN 60204-1, fail-safe protection against

restart according to EN 1037 and fulfillment of safety category 3 to EN 954-1.

Using a suitable external circuit via a safety control

– with approval for EN ISO 13849-1, performance level "d"

enables operation of the MOVITRAC® B frequency inverter with safe disconnection according to stop category 0 or 1 to EN 60204-1, fail-safe protection against

restart according to EN 1037 and fulfillment of performance level "d" to EN ISO

13849-1.

Limitations

• Important: The safety concept is only suitable for performing mechanical work

on system/machine components.

• Important: A system/machine-specific risk analysis must always be carried out

by the system/machine manufacturer and taken into account for the use of the

MOVITRAC® B frequency inverter.

• Danger of fatal injury: When the safety-oriented 24 V voltage supply is

disconnected, the mains supply voltage is still present at the frequency