Functional Safety - Lenze i550 Operating Instructions Manual

Electrical installation
Preparation Connection diagram
PTC input Networks


Functional safety

DANGER!

Uncontrolled start-up
Improper installation of the safety engineering system can cause an uncontrolled starting

action of the drives.
Possible consequences: Death or severe injuries

• Safety engineering systems may only be installed and commissioned by qualified personnel.
• All wiring must be EMC-compliant.
• All control components (switches, relays, PLC, ...) must comply with the requirements of EN

ISO 13849-1 and EN ISO 13849-2.
• Switches, relays with at least IP54 enclosure.

• Devices with a degree of protection less than IP54 must always be installed in a control
cabinet with a minimum protection class of IP54.

• The wiring must be shielded.
• It is essential to use insulated wire end ferrules for wiring.
• All safety-relevant cables outside the control cabinet must be protected, e.g. by means of a

cable duct.
• Securely eliminate short-circuits and crossed wires according to the specifications of

EN ISO 13849-2.
• Please refer to EN ISO 13849-1 and EN ISO 13849−2 for all further requirements and
measures.
• In the case of an external force effect on the drive axes, additional brakes are necessary. In
particular, please observe the effect of gravitational force on hanging loads!
• For safety-related braking functions, use safety-rated brakes only.
• The user must ensure that the inverter is only operated within the specified environmental
conditions in its intended application. Only by doing so can the specified safety-related
characteristics be adhered to.
© 11/2021 · EN · www.Lenze.com
1-phase | 120 V 1-phase | 230/240 V 3-phase | 230/240 V
Functional safety Safe torque off (STO)
3-phase | 400 V 3-phase | 480 V
DANGER!
Automatic restart when the requirement of the safety function is disabled.
Possible consequences: Death or severe injuries
• You must implement external measures in accordance with EN ISO 13849-1 to ensure that
the drive only starts up again after an acknowledgment.
NOTE
Overvoltage
Possible consequences: Destruction of the safety component
• Make sure that the maximum voltage (maximum rated) at the safe inputs does not exceed
32 V DC.
NOTE
Excessive humidity or condensation
Possible consequences: Malfunction or irreparable damage to safety component
• Only commission the safety component when it has acclimatized.
Operating instructions i550 cabinet frequency inverter | 26
Brake resistor Control terminals Relay output