HEIDENHAIN TNC 410 M Technical Manual page 115

Connection
overview of
PW 1x0(B) braking
resistor
2 – 66
Danger
Do not engage or disengage any connecting elements while the unit is
under power!
X1 UV 130 power supply module
X2 Supply voltage for the fan of the braking resistor
X3 Temperature switch
HEIDENHAIN Technical Manual for Inverter Systems and Motors