Danfoss VLT AQUA Drive FC 202 Design Manual

Also see for VLT AQUA Drive FC 202: Service guide Installation guide Installation guide Operating guide Installation guide

Contents

NOTICEThe resistor brake circuit resistance selected should not be higher than what is recommended by Danfoss. Enclosuresizes E1h–E4h contain 1 brake chopper.NOTICEIf a short circuit occurs in the brake transistor, power dissipation in the brake resistor is prevented only by using amains switch or contactor to disconnect the mains from the drive, or a contact in the brake circuit. Uninterrupted powerdissipation in the brake resistor can cause overheating, damage, or a fire.WARNINGFIRE HAZARDBrake resistors get hot while/after braking. Failure to place the brake resistor in a secure environment can result in a firerisk and property damage.• Place brake resistor in a secured location away from accidental contact and flammable material.10.7.2 Control with Brake FunctionA relay/digital can be used to protect the brake resistor against overloading or overheating by generating a fault in thedrive. If the brake IGBT is overloaded or overheated, the relay/digital signal from the brake to the drive turns off the brakeIGBT. This relay/digital signal does not protect against a short circuit in the brake IGBT. Danfoss recommends a means todisconnect the brake if a short circuit occurs in the brake IGBT.In addition, the brake makes it possible to read out the momentary power and the average power for the latest 120 s. Thebrake can monitor the power energizing and make sure that it does not exceed the limit selected in parameter 2-12 BrakePower Limit (kW). Parameter 2-13 Brake Power Monitoring selects what function occurs when the power transmitted to thebrake resistor exceeds the limit set in parameter 2-12 Brake Power Limit (kW).NOTICEMonitoring the brake power is not a safety function; a thermal switch connected to an external contactor is required forthat purpose. The brake resistor circuit is not ground leakage protected.Overvoltage control (OVC) can be selected as an alternative brake function in parameter 2-17 Over-voltage Control. Thisfunction is active for all units and ensures that if the DC-link voltage increases, the output frequency also increases to limitthe voltage from the DC link, which avoids a trip.NOTICEOVC cannot be activated when running a PM motor, while parameter 1-10 Motor Construction is set to [1] PM non-salient SPM.10.8 Residual Current Devices (RCD) and Insulation Resistance Monitor (IRM)Use RCD relays, multiple protective grounding, or grounding as extra protection, provided they comply with local safetyregulations.If a ground fault appears, a DC current can develop in the faulty current. If RCD relays are used, local regulations must beobserved. Relays must be suitable for protection of 3-phase equipment with a bridge rectifier and for a brief discharge onpower-up. See chapter 10.9 Leakage Current for more details.Electrical Installation Con... VLT® AQUA Drive FC 20284 Danfoss A/S © 05/2017 All rights reserved. MG22B1021010