35For maximum noise immunity, the encoder cable shall consist ofindividually shielded twisted pairs with one overall shield. The individualshields should be connected to 0V (com) pin 13 on the Sub D connectorand be kept separate from the outer shield. The outer shield should beconnected to earth ground, the housing of the Sub D connector.The cable shall be kept a minimum of 8 inches (20 cm) away fromall wires having greater than 24VDC on them. For best results runthe encoder cable in a separate conduit from the controller to themotor.1. Maximum Encoder voltage: +5.2 V2. Encoder line number: 1...16383 ppr2500 ppr is recommended and gives best speed resolution and regulationperformance for applications with a maximum motor speed of up to4500 rpm.F5M Interface cutoff frequency: 300 kHzObserve cutoff frequency of the encoder:g • nmaxflimit > —————————60g = Encoder increments (ppr)n = Encoder speed (rpm)f = Encoder operating frequency (Hz)3. Signal specifi cations:Four signals consisting of two square-wavepulses that are electrically 90° out of phaseand their inverse signals (TTL-push-pullsignals / RS422-conformity). Minimum "on"voltage level is 2.0V and maximum "off"voltage level is 0.5V. The encoder must beelectrically isolated from the motor shaft.Otherwise noise from the motor may corruptthe encoder signals.4. Cable specifi cations: The encoder cable shall not be so long suchthat the voltage drop in supply voltage on the encoder cable results in avoltage less than the minimum encoder supply voltage. Typically encoderlines should not be longer than 160 ft (50 m). The following must be validfor trouble free operation.[ (IEncoder • RLine ) + V Encoder (min) ] < +5.2 VRLine is the sum of the resistance of the supply wires both +V and com.2...5 V0 VInstallation and Connection
