Figure 7.53 E- and F-Frame Additional Relay Outputs7.5.11 Brake Resistor Temperature SwitchFrame Size D-E-FTorque: 0.5‒0.6 Nm (5 in-lbs)Screw size: M3This input monitors the temperature of an externallyconnected brake resistor. If the input between 104 and 106is established, the adjustable frequency drive trips onwarning/alarm 27, “Brake IGBT”. If the connection is closedbetween 104 and 105, the adjustable frequency drive tripson warning/alarm 27, “Brake IGBT.”Install a KLIXON switch that is “normally closed”. If thisfunction is not used, short circuit 106 and 104 together.Normally closed: 104-106 (factory installed jumper)Normally open: 104-105Terminal no. Function106, 104, 105 Brake resistor temperature switch.Table 7.68 Brake Resistor Temperature Switch TerminalsNOTICE!If the temperature of the brake resistor gets too highand the thermal switch trips, the adjustable frequencydrive stops braking and the motor coasts.175ZA877.10106NC104C105NOFigure 7.54 Brake Resistor Temperature Switch Interconnect7.6 Additional Connections7.6.1 DC Bus ConnectionThe DC bus terminal is used for DC backup, with theintermediate circuit being supplied from an externalsource.Terminal no. Function88, 89 DC BusTable 7.69 DC Bus TerminalsContact Danfoss if further information is required.7.6.2 Load SharingLoad sharing calls for extra equipment and safety consider-ations. For further information, Load Sharing ApplicationNote.CAUTIONNote that voltages up to 1099 V DC may occur on theterminals.Terminal no. Function88, 89 Load sharingTable 7.70 Load Sharing TerminalsThe connection cable must be shielded and the maximumlength from the adjustable frequency drive to the DC baris limited to 80 ft [25 m].Load sharing links together the DC intermediate circuits ofseveral adjustable frequency drives.WARNINGNote that a line power disconnect may not isolate theadjustable frequency drive due to DC link connection7.6.3 Installation of Brake CableThe connection cable to the brake resistor must beshielded and the maximum length from the adjustablefrequency drive to the DC bar is limited to 82 ft [25 m].Electrical Installation Design Guide232 Danfoss A/S © Rev. 2014-02-10 All rights reserved. MG34S22277
