5.5 Connection of a Brake Resistor
Connection of a brake resistor is done via terminal X2.
Danger! Switch off power supply before connecting or disconnecting the brake
resistor cables to terminal X2. Dangerous voltage may be present at the
motor terminals and the terminals of the brake resistor even after the
frequency inverter has been disconnected safely from power supply. Wait
for some minutes until the DC link capacitors have discharged before
starting to work at the unit.
• The unit may only be connected with the power supply switched off.
• Make sure that the frequency inverter is discharged.
Caution! The brake resistor must be equipped with a temperature switch. The
temperature switch must disconnect the frequency inverter from mains
supply if the brake resistor is overloaded.
5.5.1 Frequency Inverter (0.55 to 4.0 kW)
Degree of protection IP20 (EN60529) is only guaranteed if terminal X2 is connected.
Connection of brake resistor with temperature switch
X2
V WU
Rb2Rb1
R
b
T1
Rb1 Rb2
T2
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