3adw000072r0601 dcs600 system description e f

Is being stopped status bit rdyref msw bit 2 remains

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Unformatted text preview: = Power input current = Ramp Function Generator *) while the drive is being stopped, status bit RDY_REF (MSW bit 2) remains at "1" as long as the drive generates torque. Fig. 3.3/1: B MCW : Bit 4 = 0 and Bit 5 = 0 and Bit 6 = 0 Purpose: Main speed ref. is deactivated RFG-output free RAMP_OUT_ZERO (MCW Bit4=1) INCHING 1 O N (MCW Bit 8 = 1) Inching 1 Active Drive Running RFG-output released RAMP_HOLD (MCW Bit5=1) E INCHING 1 OFF (MCW Bit 8 = 0) RFG: Accelerator enable C D INCHING 2 O N (MCW Bit 9 = 1) Setpoint released RAMP_IN_ZERO (MCW Bit6=1) Operating state Inching 1 setpoint to speed control Inching 2 Active Drive Running n = n_set AT_SETPOINT (MSW Bit8=1) Inching 2 setpoint to speed control F INCHING 2 O FF (MCW Bit 9 = 0) dcs_600\docu\fig_4.dsf Control and status II F 3-3 3ADW000072R0601 DCS600 System description e f 3.4 Speed Control 3.5 Torque Control The speed controller is located in the AMC board software. Flux and Torque Calculation Speed reference The source of the reference is depending on the operating mode. Overriding control system, fieldbus adapters ➔ remote mode, DDCS via AMC board DriveWindow ➔ local mode, DDCS via AMC board Panel CDP312 ➔ local mode, connector on CON-2 Analogue inputs ➔ local I/O Speed reference features • Speed reference limiter • Additional speed ramp for emergency stop • Variable slope rate • Speed correction • Reference for inching before the ramp • 2 different references for inching behind the ramp Speed measurement The actual speed may be calculated from: • Armature voltage • Analogue tachometer • Pulse encoder Controller features • • • • • • • • PID controller 2 first order low pass filters Window control Acceleration compensation Speed and torque adaptation Droop Additional torque references Torque limitation and gear backlash function (the integral part of the controller is set to a suitable value on limitation) • Oscillation damping (band rejection filter for speed error) The torque control is in general an open loop control. The flux is adjusted by the field current. The reference of the field current is generated by the superimposed armature voltage control. The torque is adjusted by the armature current. The conversion from torque to current reference is done by means of the calculated flux (based on the field current and saturation characteristic). Torque reference features • Torque reference A with 1st order filter and load share • Torque reference B with torque ramp • Torque reference limiter • Torque correction and torque step • Torque correction by means of analogue input 1 A good behaviour in the field weakening requires speed measurement by tachometer or encoder. A simplified scheme of the torque reference chain is given in diagram fig. 3.8/2. 3.6 HMI (Human Machine Interface) The HMI is performed by CDP 312 control panel or by DriveWindow. Both tools contain: • Display of drive signals • Setting of drive parameters • Display fault and alarm messages • Control the d...
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