ABB ACS880-04F-504A-3, Hardware Manual

Page: 195 / 202

where
Instantaneous load capacity of the custom resistor
P
R, inst
Drive intermediate DC circuit voltage: U
DC
1.35 · 1.2 · 415 V DC (when supply voltage is 380 … 415 V AC)
1.35 · 1.2 · 500 V DC (when supply voltage is 440 … 500 V AC) or
1.35 · 1.2 · 690 V DC (when supply voltage is 525 … 690 AC)
Resistance of the custom resistor R
Mechanical installation of resistors
All brake resistors must be installed outside the drive. Obey the resistor manufacturer’s
instructions.
Electrical installation
￭
Measuring the insulation of the assembly
Obey the instructions given in section Measuring the insulation resistance of the brake
resistor circuit (page 84) .
￭
Connection diagram
See section Power cable connection diagram (page 87) .
￭ Connection procedure
• Connect the resistor cables to the R+ and R- terminals in the same way as the
other power cables. If a shielded three-conductor cable is used, cut the third
conductor and ground the twisted shield of the cable (protective earth conductor
of the resistor assembly) at both ends.
• Wire the thermal switch to a digital input on the drive control unit as shown below.
Θ
+24VD x
DIx x
Start-up
Note: New brake resistors may be coated with storage grease. As the brake chopper
operates for the first time, the grease burns off and may produce some smoke. Make
sure there is sufficient ventilation.
￭
Parameter settings
Set the following parameters:
• Disable the overvoltage control of the drive with parameter 30.30 Overvoltage
control.
Resistor braking 195