R+ R-
R+ R-
21 3
t°
3
1
2
V23V22
21X1
t°
1 2X2
X3 21 3
XD24
1 DIIL
2 +24VD
NBRA brake chopper1
NBRC control board of the brake chopper2
Brake resistor3
WARNING!
Input terminal block X1 of the brake chopper is at intermediate circuit potential of
the drive. This voltage is extremely dangerous and can cause serious damage or
injury if the isolation level and protection conditions for the thermal switches are
not sufficient. Insulate the thermal switches correctly (over 2.5 kV) and shroud
them against contact.
Start-up
Set the following parameters (ACS880 primary control program): Make sure that
• parameter 30.30 Overvoltage control is disabled.
You can activate and configure an additional thermal protection function for the chopper
and resistor. See the firmware manual.
234 Resistor braking
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