• 60 m (200 ft) between multiple inverter units• 60 m (200 ft) between external power supply and first inverter unit• 30 m (100 ft) between BCU control unit and last inverter module in the chain.Note:The voltage at the INx terminals of each inverter control unit (or frame R8i inverter module)must be at least 17 V DC to be interpreted as “1”.￭ Grounding of protective shields• Ground the shield in the cabling between the activation switch and the control unit atthe control unit.• Ground the shield in the cabling between two control units at one control unit only.• Do not ground the shield in the cabling between BCU and R8i module, or between R8imodules.￭ Frame n×R8i inverter unit (internal power supply)WARNING!Frame R8i inverter modules are as standard delivered with a jumper wire set thatsupplies 24 V from connector X53 to X52. The jumper wire set must be removedbefore wiring the Safe torque off circuit.234 The Safe torque off function Frame n×R8i inverter unit (internal power supply)+24 V OUT1SGNDIN1IN2XSTOKIN1SGNDXSTO OUTIN2SGND24VDC CH1GND CH1STO IN (X52)24VDC CH2FEGND CH224VDC CH1GND CH1STO OUT (X51)24VDC CH2FEGND CH224VDC CH1GND CH1STO IN (X52)24VDC CH2FEGND CH224VDC CH1GND CH1STO OUT (X51)24VDC CH2FEGND CH2Control unitInverter moduleTo nextinverter moduleInverter moduleThe Safe torque off function 255
