HEIDENHAIN TNC 410 M Technical Manual page 133

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Warning
The ZKF 110 differs from the ZKF 120 only in its maximum leakage current.
If you are using the ZKF 110, a HEIDENHAIN technician must check on site
whether the leakage current is less than 1.3 A. With the ZKF 120, this
verification is not necessary because a leakage current of 6 A is sufficient
in any case.
Warning
The total power of the direct drives must not exceed the power of the filter.
Warning
A dc-link filter is not permitted for non-HEIDENHAIN inverters!
HEIDENHAIN Technical Manual for Inverter Systems and Motors