Operating Instructions

Service, maintenance and fault rectification
Fault rectification
8
104 | 118
Siemens A5E36496664A_f
Smart Infrastructure 2021-10-11
8.3.3.1 Tests without a power supply
DANGER
Danger due to electric current!
If the terminals are not accessible externally, do not open the device because you
will be exposed to a great risk and this will invalidate the warranty.
● In this case, contact your local Siemens branch office.
Preliminary tests
Check/Test Description OK
Disconnect the
power supply
 Ensure that the drive is disconnected from the line supply.

Safeguard  Take measures (a mechanical maintenance switch, for example) to
prevent the variable speed drive and the connected motor
(depending on application) from restarting.

Ensure that there is
no voltage present
at the drive.
1. Measure the voltage between L1/L2 and L3.
2. Make sure that the system is completely de-energized.

Damage caused by
external factors
 Check whether parts are damaged, for example by corrosion, paint,
moisture, oil, dust, powder, etc.

Electrical damage  Look for evidence of flashovers or burning at the power terminals.
These are caused by connecting the power cables incorrectly.

Fuses
1. Check the sizes of the fuses.
2. Make sure that they are not "open".
