Safety Instructions And Precautions; Safety Instructions; Precautions; Siemens S120_En_Rev06-08062017.Docx - Siemens S120 Instructions Manual

2 SAFETY INSTRUCTIONS AND PRECAUTIONS

Read all of this manual before powering the equipment, following step by step the procedures.
2.1

SAFETY INSTRUCTIONS

Carefully follow the procedures given below, to prevent the risk of serious accidents.
1- The leakage current from the inverter to earth is greater than 30mA, therefore a differential
switch with Id of at least 300mA, type B or type A, must be provided. Regulations require the use
of a cable with a section of at least 10 mm² for the earth connection. If the differential switch trips
when the main power switch is closed, do not repeat the operation in succession, because
the inverter could become permanently damaged.
2- If the parameters are incorrect, the inverter can cause the motor to rotate at a speed higher than
synchronous speed. Do not run the motor beyond its electrical and mechanical limits. The installer is
responsible for ensuring that movements occur in safe conditions, without exceeding the specified
operating limits.
3- Risk of electrocution. Power on the inverter only with the front cover fitted. NEVER remove the cover
during operation. Before carrying out any operation on the equipment, disconnect the power supply
and wait a few minutes for the internal capacitors to discharge.
4- The external braking resistor heats up during operation. Do not install it near or in contact with
inflammable materials. To improve heat dissipation it is advisable to fix it to a metal plate. Make sure
it is suitably protected and cannot be touched.
5- The inverter must always be connected to the mains. In case of an interruption, wait at least 1
minute before reconnecting. RECONNECTING WITHOUT WAITING LONG ENOUGH WILL
DAMAGE THE INVERTER.
6- Do not use an oscilloscope or similar instruments to test the internal circuits of the inverter. This type
of operation must be performed only by specialized personnel.
2.2

PRECAUTIONS

Carefully follow the procedures given in the manual to avoid the risk of damaging the inverter.
1- Do not connect the equipment to a voltage higher than that permissible. An excessive voltage can
cause permanent damage to the internal components.
2- To avoid damaging the inverter in case of prolonged stoppages with no power supply, before
restarting proceed as follows:
- If the inverter has been idle for several months, connect it to the power supply for at least 1
hour in order to regenerate the bus capacitors.
- If the inverter has been idle for more than one year, power it for 1 hour at 50% less than the
nominal voltage, and then for 1 hour at nominal voltage.
3- Do not connect capacitors to the inverter outputs.
4- Before resetting an inverter fault, carefully check what caused activation of the protection.
5- Use an inverter with rated current equal to or higher than the motor rated current.

Siemens S120_EN_rev06-08062017.docx

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