Danfoss VLT AQUA Operating Instructions Manual

Also see for vlt aqua: Instructions Design guide Instruction manual Operating instructions Design guide

Contents

2.1.2 General WarningWarning:Touching the electrical parts may be fatal - even after the equipment has been disconnected from mains.Also make sure that other voltage inputs have been disconnected, (linkage of DC intermediate circuit), as well as the motor connectionfor kinetic back-up.Before touching any potentially live parts of the frequency converter, wait at least as follows:380 - 480 V, 160 - 250 kW, wait at least 20 minutes.380 - 480 V, 315- 710 kW, wait at least 40 minutes.Shorter time is allowed only if indicated on the nameplate for the specific unit. Be aware that there may be high voltage on the DClinks even when the Control Card LEDs are turned off. A red LED is mounted on a circuit board inside both the drive and the activefilter to indicate the DC bus voltages. The red LED will stay lit until the DC link is 50 Vdc or lower.Leakage CurrentThe earth leakage current from the frequency converter exceeds 3.5 mA. According to IEC 61800-5-1 a reinforced Protective Earthconnection must be ensured by means of: a min. 10mm² Cu or 16mm² Al PE-wire or an addtional PE wire - with the same cable crosssection as the Mains wiring - must be terminated separately.Residual Current DeviceThis product can cause a D.C. current in the protective conductor. Where a residual current device (RCD) is used for extra protection,only an RCD of Type B (time delayed) shall be used on the supply side of this product. See also RCD Application Note MN.90.GX.02.Protective earthing of the frequency converter and the use of RCD's must always follow national and local regulations.2.1.3 Before Commencing Repair Work1. Disconnect the frequency converter from mains2. Disconnect DC bus terminals 88 and 893. Wait at least the time mentioned in section General Warning above4. Remove motor cable2.1.4 Special conditionsElectrical ratings:The rating indicated on the nameplate of the frequency converter is based on a typical 3-phase mains power supply, within the specified voltage, currentand temperature range, which is expected to be used in most applications.The frequency converters also support other special applications, which affect the electrical ratings of the frequency converter. Specialconditions which affect the electrical ratings might be:• Single phase applications• High temperature applications which require derating of the electrical ratings• Marine applications with more severe environmental conditions.Consult the relevant clauses in these instructions and in the VLT® AQUA Drive Design Guide for information about the electrical ratings.Installation requirements:The overall electrical safety of the frequency converter requires special installation considerations regarding:• Fuses and circuit breakers for over-current and short-circuit protection• Selection of power cables (mains, motor, brake, loadsharing and relay)• Grid configuration (IT,TN, grounded leg, etc.)• Safety of low-voltage ports (PELV conditions).Consult the relevant clauses in these instructions and in the VLT® AQUA Drive Design Guide for information about the installation requirements.2 SafetyVLT AQUA Low Harmonic Drive Operating In-structions8 MG.20.T1.02 - VLT® is a registered Danfoss trademark2