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Commissioning

7.1 Safety instructions

WARNING

Electric shock when connected to inadequately grounded line supplies

Connecting a motor to an inadequately grounded line supply can result in death, severe injury

and damage to the motor if a fault occurs.

• Connect motors, as part of the drive system, to TN and TT line supplies with a grounded

neutral point or to IT line supplies.

• Ensure that the SINAMICS devices and motors are compatible with the residual current

device according to EN 61800-5-1 before you connect the devices and motors to the line

supply using residual current devices (RCDs).

• For line supplies with grounded line conductor, e.g. TT line supplies, use an isolating

transformer with grounded neutral point (on the secondary side) between the line supply

and the drive system, so that the motor insulation is not overstressed.

• When connected to IT line supplies, a monitoring device must signal the 󹪝rst fault between

an active part and ground. Eliminate this fault immediately.

WARNING

Electric shock caused by high touch voltages for brake cables

For motor cables with integrated brake cable, when the motor is operated, the motor can

charge the brake cable up to hazardous voltage levels. Coming into contact with the

conductors or the shield of the brake cable can result in death or serious injury.

• Use motor cables with separate, shielded brake cables and connect the shield of the brake

cable at both ends.

WARNING

Electric shock when checking the insulation resistance

During the measurement and immediately afterward, high voltages can be present at the

terminals that can cause death or severe injury as result of an electric shock.

Contact with live parts causes electric shocks.

• Work on power installations must only be performed by quali󹪝ed personnel.

• Before you begin measuring the insulation resistance, read the operating manual for the

insulation resistance meter you are going to use.

• Never touch the terminals when making measurements or immediately after the

measurement.

• Check the connected supply feeder cables to ensure that the line supply voltage cannot be

connected.

SIMOTICS S-1FK2 synchronous motors for SINAMICS S120

Operating Instructions, 02/2022, A5E46089564B AD 81

Siemens SIMOTICS S-1FK2 User Manual

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