26GB3.2 EncoderConnections3.2.1 X3A RS422/TTLIncremental EncoderInputConnect the incremental encoder mounted on the motor to the 15-pinSub-D connector at X3A on the COMBIVERT F5M. This connectionprovides speed feedback and is imperative to the proper operation of theF5M.Input WiringA +B +A -B -approx.120 Ω5 4 3 2 110 9 8 7 615 14 13 12 115.2 V x I +5VI var = 170 mA - –————V varPin No. Signal3 A-4 B-8 A+9 B+11 V var 24...30 V12 +5.2 V13 0V (com)14 N-15 N+Shield HousingONLY when the inverter is switched off and the voltagesupply is disconnected may the feedback connectors beremoved or connected!The internal voltage of "V var " 24...30 V (1) isa unregulated supply and will allow up to170 mA max. current draw, for X3A andX3B total. If higher voltages / currents arerequired, then an external power supplymust be provided.The +5.2 V is a regulated voltage supplygenerated from V var and will allow up to500 mA max. current draw, for X3A andX3B total. If additional current is requiredfrom the +5.2 V output, the current from V vardecreases in accordance with followingformula:The following specifications apply to encoder interface X3A and X3B, channel1 and 2 respectively:• Max. operating frequency: 300 kHz.• Internal terminating resistance: Rt = 120 Ω• RS422 or TTL level squarewavevoltage level: 2...5 VdcInstallation and Connectionapprox.34 Ω
