Resistor braking124All braking resistors must be installed outside the converter module. The resistors are built in an IP 00 metal frame. The 2xSAFUR and4xSAFUR resistors are connected in parallel. Note: The SAFUR resistors are not UL listed.Resistor installation and wiringAll resistors must be installed outside the drive module in a place where they willcool.WARNING! The materials near the brake resistor must be non-flammable. Thesurface temperature of the resistor is high. Air flowing from the resistor is ofhundreds of degrees Celsius. Protect the resistor against contact.Use the cable type used for drive input cabling (refer to chapter Technical Data) toensure the input fuses will also protect the resistor cable. Alternatively, two-conductor shielded cable with the same cross-sectional area can be used. Themaximum length of the resistor cable(s) is 10 m (33 ft). For the connections, see thepower connection diagram of the drive.Combined braking cycles for R7:• After Pbr5, Pbr10 or Pbr30 braking, the drive and the chopper will withstand Pbrcont continuously.• Pbr5 , Pbr10 or Pbr30 braking is allowed once every minute.• After Pbrcont braking, there has to be at least 30 seconds without any braking if the subsequent braking power is greater than Pbrcont.• After Pbr5 or Pbr10 braking, the drive and the chopper will withstand Pbr30 within a total braking time of 30 seconds.• Pbr10 braking is not acceptable after Pbr5 braking.Combined braking cycles for R8:• After Pbr5 , Pbr10 or Pbr30 braking, the drive and the chopper will withstand Pbrcont continuously. (Pbrcont is the only allowed braking powerafter Pbr5 , Pbr10 or Pbr30 .)• Pbr5 , Pbr10 or Pbr30 braking is allowed once every minute.• After Pbrcont braking, there has to be at least 60 seconds without any braking if the subsequent braking power is greater than Pbrcont.PbrtPbr5 or Pbr10Pbr30Pbrcontmin. 30 s max 30 s min. 30 sNo brakingExamplesmin. 30 smax 5 s or 10 smax 30 sPbrtPbr5, Pbr10 or Pbr30Pbrcontmin. 60 sNo brakingExamplesmin. 60 smax 5 s, 10 s or 30 s
