Power Test - Siemens G120P Manual

IGBT bridge test
Positive measuring Negative measuring point Expected result
point
U DC+
V DC+
W DC+
U DC
V DC
W DC
6.4.2
Check/Test Description
Measuring DC bus The measured DC voltage at the terminals (not available on all types) should correspond
voltage to the peak-to-peak voltage of the applied AC input (typically 580 V).
DC bus voltage – from r0070 is the measured DC bus voltage of the drive. This does not function below 200 V
parameter r0070 DC. The parameter has access level 3.
DC bus voltage – from r0026 is the measured, smoothed DC bus voltage of the drive. This does not function
parameter r0026 below 200 V DC. The parameter has access level 2.
Siemens AG
Diode aperture – typically 0.3...0.5 V
Diode aperture – typically 0.3...0.5 V
Diode aperture – typically 0.3...0.5 V
Diode block – OL/High impedance
Diode block – OL/High impedance
Diode block – OL/High impedance
Procedure
 If the drive fails any of these tests:
Remove the power unit in order to replace or repair it.

 If a short-circuit occurs at the input rectifiers or at components of the IGBT
bridge:
Check the state of fuses in the supply line, of contactors, disconnectors or of

the motor itself.
Please be aware that an apparently open circuit can also occur following a
component short-circuit and the resulting strong flow of current.

Power test

DANGER
Electrical current and moving parts when commissioning equipment or systems
● Before commissioning the drive, secure the system, for example by cordoning
it off.
● Ensure that all the covers are applied to the drive, and that no live parts are
accessible.
Wherever possible, connect measuring equipment before switching the drive on.
Fault rectification
6
Hardware diagnostics
OK
OK
55
CM2G5111en
2014-05-16