Danfoss ADAP-KOOL AKD 102 Operating Instructions Manual

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Contents

Danfoss ADAP-KOOL AKD 102 Operating Instructions Manual Manual pdf 53 page image

4.5 Additional Connections4.5.1 Mechanical Brake ControlIn hoisting/lowering applications, it is necessary to be able to control an electro-mechanical brake:• Control the brake using any relay output or digital output (terminal 27 or 29).• Keep the output closed (voltage-free) as long as the frequency converter is unable to ‘support’ the motor, for example due to the load beingtoo heavy.• SelectMechanical brake control [32] in par. 5-4* for applications with an electro-mechanical brake.• The brake is released when the motor current exceeds the preset value in par. 2-20Release Brake Current.• The brake is engaged when the output frequency is less than the frequency set in par. 2-21Activate Brake Speed [RPM]or par. 2-22ActivateBrake Speed [Hz], and only if the frequency converter carries out a stop command.If the frequency converter is in alarm mode or in an over-voltage situation, the mechanical brake immediately cuts in.4.5.2 Parallel Connection of MotorsThe frequency converter can control several parallel-connected motors.The total current consumption of the motors must not exceed the ratedoutput current I M,N for the frequency converter.NB!Installations with cables connected in a common jointas in the illustration below, is only recommended forshort cable lengths.NB!When motors are connected in parallel, par. 1-29Au-tomatic Motor Adaptation (AMA) cannot be used.NB!The electronic thermal relay (ETR) of the frequencyconverter cannot be used as motor protection for theindividual motor in systems with parallel-connectedmotors. Provide further motor protection by e.g. ther-mistors in each motor or individual thermal relays (cir-cuit breakers are not suitable as protection).Problems may arise at start and at low RPM values if motor sizes are widely different because small motors' relatively high ohmic resistance in the statorcalls for a higher voltage at start and at low RPM values.4.5.3 Motor Thermal ProtectionThe electronic thermal relay in the frequency converter has received UL-approval for single motor protection, when par. 1-90Motor Thermal Protec-tionis set forETR Trip and par. 1-24Motor Current is set to the rated motor current (see motor name plate).For thermal motor protection it is also possible to use the MCB 112 PTC Thermistor Card option. This card provides ATEX certificate to protect motors inexplosion hazardous areas, Zone 1/21 and Zone 2/22. Please refer to theDesign Guide for further information.ADAP-KOOL® Drive AKD 102 High Power 4 Electrical InstallationMG.11.O1.02 - ADAP-KOOL® is a registered Danfoss trademark 534