Elmo ISP manual Amplifier adjustment and diagnostics, Balance adjustment, Current limit adjustment

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8.Amplifier adjustment and diagnostics

Important remarks:

A. If all the previous steps were accomplished you may now turn on the power and continue with the following adjustments. You may omit the step for current mode or velocity mode according to your application.

B. In some applications, especially those where the motor electrical parameters (total inductance and resistance in the armature circuit) are much smaller or larger than normally encountered, the current loop response should be optimized before proceeding with the following steps - See Appendix A.

8.1Balance adjustment

If the motor is rotating with the command signal at zero voltage, a balance adjustment will be necessary. Turn the balance trimmer (T5) as required until the motor stops. As a rule, have the command signal connected and set to zero when balancing the amplifier. This way, any offset in the command signal will be canceled.

8.2Current limit adjustment

The amplifiers' current limits can be adjusted without the need for loading. Disconnect motor leads and connect a voltmeter between the Current Command Monitor (terminal H-15,R-18a,E-J1/7) and the circuit common. Apply maximum input voltage to one of the inputs to cause an error at the error amplifier (input gain trimmer should be fully CW). In order to adjust the continuous limit - turn T3 (Ip) fully CCW to disable Ip, then use T2 (Ic) to adjust the continuous limit by monitoring the meter readout. Full CW rotation of T2 will result in rated current limit. After adjusting the continuous limit, turn T3 up to the desired peak level.

The current monitor range is up to 7.5V and its scale depends on the amplifier rated continuous current (Ic) and is given by:

ISP - Rev 6/95

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Contents Rev 6/95 ISP Rev 6/95 ELMO-WARRANTY Performance Read chapters Table of Contents Balance adjustment Current limit adjustment Description Standard featuresProtective functions Technical specifications Type DesignationOperation of the servo control Inputs Velocity mode Velocity control using armature voltage feedback Current modeCurrent limits Current loopTime dependent peak current limit Dynamic contouring of continuous and peak current limits Operation of the shunt regulator Temperature protection Loss of velocity feedback signalProtective functions Short circuit protectionCurrent Command Monitor Input ISP Control Board Page Contact rating 0.5A, 200V, 10W Terminals of ISP Panel Version Mother Board terminals MBA-ISP/N Terminals for ISP mounted in 3U size ENC GNDContact rating 0.5A, 200V, 10W Page MBA ISP/3UE Installation procedures Mounting WiringLoad inductance AC power supply2Vdcmin Vdc 0.9Vdcmax Wiring diagrams ISP GNDGround Do not groundAC ISP ISP Control Connections Tachogenerator Feedback ISP Control Connections Armature Voltage Feedback Start Up Procedures Disable by LowEnable by High ISP Control Board Selecting the reference signal gain Converting the amplifier into current modeSee .1 for calculation of other values Activating the loss of tacho protection velocity mode only For VtmVelocity control using tachogenerator feedback Latch mode of the protective functionsActivating the dynamic contouring of the current limits For ISP-X/135 For ISP-X/65IxR compensation Balance adjustment Amplifier adjustment and diagnosticsCurrent limit adjustment Adjusting the motor speed velocity mode only Adjustment of the IxR compensationResponse adjustment velocity mode only Typical velocity response waveforms ISP Rev 6/95 Tables and Summaries Adjusting trimmers LED diagnosticsAppendix a Response adjustment current loop Fig. A-1 Typical current response waveforms ISP Rev 6/95 Appendix B Current limits contour adjustment Velocity TorqueDynamic contouring with armature voltage feedback ISP Rev 6/95 SP1 TOP View SP1 Side View SP1 Side View SP2 TOP View SP2 Side View SP2 Side View SP3 TOP View SP3 Side View SP3 Side View SP4 TOP View SP4 Side View SP4 Side View ISP Rack Mounting 8T and 15T TOP View ISP Rack Mounting 3U/8T Side View 128.7 Front Panel for ISP 3U/8T ISP Rack Mounting 3U/15T -SIDE View ISP Rack Mounting 3U/15T Side View Front Panel for ISP 3U/15T ISP Rack Mounting 3U/12T and 3U/19T TOP View ISP Rack Mounting 3U/12T -SIDE View ISP Rack Mounting 3U/12T Side View Front Panel for ISP 3U/12T ISP Rack Mounting 3U/19T -SIDE View ISP Rack Mounting 3U/19T Side View Front Panel for ISP 3U/19T Enclosure Mechanical Outline List of Elmo Service Centers Europe