SEWControl Cabinet Inverter MOVITRAC® B Functional Safety

inverter DC link.

• Danger of fatal injury: When the 24 V voltage supply is disconnected, the DC

link voltage is still present at the MOVITRAC® B frequency inverter.

• Important: If work is carried out on the electrical section of the drive system,

the DC link voltage must be disconnected.

Representation of the "Safety concept for MOVITRAC® B / control unit"

[1] Safety relay (external)

[2] Low-voltage switch-mode power supply

[3] Safety switched-mode power supply (SNT)

[4] Voltage supply for controlling the power transistors

[5] Feedback to the central processing unit: Voltage supply for output stage control OK (not in safety circuit)

[6] Pulse width modulated signals for output stage

[7] Power section

[8] Motor

[9] High-voltage switch-mode power supply

Representation of the "Safety concept for MOVITRAC® B / size 0"

Safety-Relevant Conditions

The following conditions are mandatory for the installation and operation of

MOVITRAC® B in applications with safe disconnection of the drive in accordance with

category 0 or 1 of EN 60204-1 and fail-safe protection against restart according to

EN 1037, and conformance with safety category 3 of EN 954-1 or performance level "d"

of EN ISO 13849-1. The conditions are divided into the following sections:

• Approved devices

• Installation requirements

• Requirements for external safety relays

• Startup requirements

• Operation requirements

3.1 Information on the stop categories

• Stop category 0 means that the safety 24 V voltage supply can be disconnected

independent of the setpoints.

• Observe the following procedure for stop category 1:

– Decelerate the drive using an appropriate brake ramp specified by the setpoint.

– Disconnect the safety-oriented 24 V voltage supply

3.2 Approved devices

The following frequency inverters are permitted for applications with safe disconnection

according to stop category 0 or 1 of EN 60204-1, fail-safe protection against restart

according to EN 1037 and compliance with safety category 3 according to EN 954-1 or

performance level "d" according to EN ISO 13489-1.

3.2.1 MOVITRAC® B for AC 3 × 380 – 500 V / 200 – 240 V supply voltage

3.2.2 Hazard caused by coasting drive

Note that if the drive does not have a mechanical brake, or if the brake is defective, the

drive may coast to a halt.

Note: If coasting to a halt results in application-dependent hazards, take

additional protective measures (e.g. movable covers with closure), which cover

the hazardeous area until persons are no longer in danger.

The additional protective covers must be designed and integrated in such a way that

they meet the safety category required for the machine. 

After activating the stop command, access to the machine must remain blocked until the

drive has reached standstill, or the access time has to be determined to ensure that an

adequate safety distance is maintained.

3.3 Installation requirements

Note the following instructions for applications of MOVITRAC® B with safe disconnection of the drive according to stop category 0 or 1 according to EN 60204-1 and fail-safe

protection against restart according to EN 954-1 safety category 3 or performance level

"d" according to EN ISO 13849-1. 

• The line between the safety control system (or the safety-oriented tripping device)

and MOVITRAC® B terminal X17 is designated as the safety-oriented 24 V voltage

supply.

• Power lines and the safety-oriented 24 V supply voltage must be installed in separate

cable ducts. 

• The safety-oriented 24 V supply voltage must be routed according to EMC guidelines

and as follows:

– Outside an electrical installation space: Shielded cables must be routed

permanently (fixed) and protected against external damage, or other equivalent

measures.

– Individual conductors can be routed inside an electrical installation space.

Observe the respective regulations governing the application.

• It must be ensured that parasitic voltages cannot be generated in the safety-oriented

24 V supply voltage.

• The total cable length between the safety control system (e.g. safety relay) and

MOVITRAC® B is limited to a maximum length of 100 m for EMC reasons.

• The switching capacity of the safety relay and the maximum permissible voltage drop

on the 24 V supply cable must be observed during disconnection of group drives.

• Only use terminal connections (terminal blocks) that meet EN 60204-1 and prevent

short-circuits.

• Observe the notes in the "MOVITRAC® B" operating instructions on EMC compliant

cabling. It is essential that you apply the shielding at both ends on the housing.

• Only use power supplies with safe isolation (SELV/PELV) according to VDE010.

According to EN 60950-1, the voltage between the outputs or between any output

and a ground part must not exceed DC 60 V voltage for longer than 0.2 s after only

one fault. The maximum DC voltage must be 120 V.

• You must remove the jumpers at X17:1 to X17:4 (see following figure) for use in

applications with safe disconnection of the drive according to stop category 0 or 1 in

accordance with EN 60204-1 and fail-safe protection against restart according to

EN 954-1 safety category 3 or performance level "d" according to EN ISO 13849-1.