Engineering Guide CDA3000
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3 Selection of inverter module
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3.2.16 Measurement
on the inverter
module
Measurement on the inverter module is not necessary, because the
inverter delivers all required actual values. Actual values such as:
are available. The actual values can be called up by way of the KP200
control unit or the D
RIVE
M
ANAGER
user software (with the digital scope
function).
If measurements are nevertheless to be taken on the CDA3000, the
following conditions must be met.
Measurement on the CDA3000 inverter module
Because of the non-sinusoidal variables at the input and output of the
inverter, only measurements with special measuring equipment are
permitted. Since such equipment is not usually available to practicians
on-site, conventional measuring equipment can be used as a fallback. A
measuring circuit with device data is shown in Figure 3.29 on the follo-
wing page. However, it should be made clear that the measuring device
displays - in particular at the inverter output - are only guide values.
When using an oscilloscope to represent the pulsed voltage, measure-
ments should be taken with differential inputs.
In all measurement operations you should remember that the DC-link
capacitor on the voltage transformer may still be live long after the device
has been shut off.
•
Motor frequency
•
Motor speed
•
Motor apparent current
•
Motor active current
•
Motor apparent power
•
Motor active power
•
Motor voltage
•
DC-link voltage
•
Motor temperature
•
Heat sink temperature
•
Device interior temperature
•
etc.
