Danfoss FC 102 Design Manual

Also see for VLT HVAC Drive FC 102: Operating instructions Service guide Programming guide Installation guide Installation guide

Contents

175HA036.11U1 V1 W196 97 98FCMotorU2 V2 W2U1 V1 W196 97 98FCMotorU2 V2 W2Illustration 6.40 Terminal Connection for Clockwise andCounter-clockwise Rotation• Terminal U/T1/96 connected to U-phase• Terminal V/T2/97 connected to V-phase• Terminal W/T3/98 connected to W-phaseThe direction of rotation can be changed by switching 2phases in the motor cable or by changing the setting of4-10 Motor Speed Direction.Motor rotation check can be performed using 1-28 MotorRotation Check and following the steps shown in thedisplay.NOTICEIf a retrofit applications requires unequal amount ofwires per phase, consult the factory for requirementsand documentation or use the top/bottom entry sidecabinet option.6.4.2 Motor Thermal ProtectionThe electronic thermal relay in the frequency converter hasreceived UL-approval for single motor protection, when1-90 Motor Thermal Protectionis set for ETR Trip and1-24 Motor Current is set to the rated motor current (seethe motor name plate).For thermal motor protection it is also possible to use thePTC Thermistor Card option MCB 112. This card providesATEX certificate to protect motors in explosion hazardousareas, Zone 1/21 and Zone 2/22. When 1-90 Motor ThermalProtection is set to [20] ATEX ETR is combined with the useof MCB 112, it is possible to control an Ex-e motor inexplosion hazardous areas. Consult the Programming Guidefor details on how to set up the frequency converter forsafe operation of Ex-e motors.6.4.3 Parallel Connection of MotorsThe frequency converter can control several parallel-connected motors. When using parallel motor connectionfollowing must be observed:• Recommended to run applications with parallelmotors in U/F mode 1-01 Motor Control Principle.Set the U/F graph in 1-55 U/f Characteristic - Uand 1-56 U/f Characteristic - F.• VCCplus mode may be used in some applications.• The total current consumption of the motorsmust not exceed the rated output current IINV forthe frequency converter.• If motor sizes are widely different in windingresistance, starting problems may arise due to toolow motor voltage at low speed.• The electronic thermal relay (ETR) of thefrequency inverter cannot be used as motorprotection for the individual motor. Providefurther motor protection by e.g. thermistors ineach motor winding or individual thermal relays.(Circuit breakers are not suitable as protectiondevice).Electrical Installation Design GuideMG11BC02 Danfoss A/S © Rev. 06/2014 All rights reserved. 1056 6