HEIDENHAIN TNC 410 M Technical Manual page 284

Mounting the
HEIDENHAIN
UE 2xxB and
UR 2xx(D) compact
inverters
Conducted
interference
5 – 36
Warning
All electrical screw connections must be tightened after installation is
complete (tightening torque 3.5 Nm).
To suppress occurrence of conducted interference, toroidal cores must be
mounted in the motor leads (X80 to X84), in the voltage supply lead (X31) and
in the lead to the braking resistor (only with UE 21x). See "Mounting the
Toroidal Cores" on page 5 – 38.
No toroidal cores are necessary for the UR 2xx and UR 2xxD.
HEIDENHAIN Technical Manual for Inverter Systems and Motors