KEB Combivert F5 series Installation Manual

Also see for COMBIVERT F5: INSTALLATION GUIDELINE Installation manual Instruction manual Instruction manual Installation manual

GB - 13Installation and Connection3.3.6 Connection of a braking resistor with fire preventionWith input rated voltage of 480 Vac no braking resistor shall be connected atcontrol type "BASIC". The operating threshold of the braking resistor (Pn.69)must be adjusted at least to 770 Vdc for all other controls (see annex).At defective braking transistor this circuit prevents against overheating and fire. The bra-king resistor overheats and opens the OH terminals with defective braking transistor. TheOH terminals open the holding circuit of the input contactor, so that the input voltage isswitched off in error case. An error in inverter is released by opening the auxiliary contacts13/14 of K3 and the modulation is switched off. Regenerative operation is also secured bythe internal fault disconnection. The input must be programmed and inverted to "externalerror". Automatic restarting after cooling of the braking resistor is prevented by the self-holding circuit of K3.If the PTY evaluation of the motor at terminals T1/T2 is not used, these terminalscan be used instead of the programmable input. The temperature input must beoperated in PTC mode.Picture 3.3.6 Braking resistor with fire preventionT1 T2L1L2L3K32U V WL1 L2 L31436512111413G1R1++PBOH1OH2I10VPEFR2+24VS2I1G1K3GNDS1 K3 1112H10VR1OH2OH1K3 1314K3 Line contactor with auxiliarycontactsH1 Tripping controlS1 Push-bottom switch for switch on R1 Braking resistor with temperature switchS2 Emergency stop circuit braker forswitch offR2 PTC sensor e.g. of the motorG1 Inverter with programmable input I1