Contents - Table Of Contents
- Table Of Contents
- Table Of Contents
- Introduction
- Disposal
- Safety Instructions
- How to Install
- Mechanical Dimensions
- Mechanical Installation
- Terminal Locations, F8–F15
- Inverter, Enclosure Sizes F10 and F11
- Inverter, Enclosure Sizes F12 and F13
- Inverter, Enclosure Sizes F14 and F15
- Rectifier, Enclosure Sizes F10, F11, F12, and F13
- Rectifier, Enclosure Sizes F14 and F15
- Options Cabinet, Enclosure Size F9
- Options Cabinet, Enclosure Sizes F11 and F13
- Options Cabinet, Enclosure Size F15
- Installing the Panel Options
- Electrical Installation
- Transformer Selection
- Grounding
- Torque
- tion
- Connection of Mains
- Supplementary Fuses
- Motor Insulation
- Control Cable Routing
- Electrical Installation, Control Cables
- Switches S201, S202, and S801
- Connection Examples
- Final Set-up and Test
- Additional Connections
- Parallel Connection of Motors
- How to Programme
- Initial Commissioning
- Quick Set-up
- Parameter Menu Structure
- General Specifications
- Cable Specifications
- Electrical Data
- Warnings and Alarms
- Index
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3.4.15 Motor InsulationFor motor cable lengths ≤ the maximum cable lengthlisted in chapter 5.4 Cable Specifications, the motorinsulation ratings in Table 3.28 are recommended. Peakvoltage can be up to twice the DC-link voltage, and 2.8times the mains voltage, due to transmission line effects inthe motor cable. If a motor has lower insulation rating, usea dU/dt or sine-wave filter.Nominal mains voltage [V] Motor insulation [V]UN ≤420 Standard ULL=1300420N≤500 Reinforced ULL=1600500N≤600 Reinforced ULL=1800600N≤ 690 Reinforced ULL=2000Table 3.28 Motor Insulation Ratings3.4.16 Motor Bearing CurrentsAll motors installed with VLT® AutomationDrive FC 302frequency converters with a power rating of 250 kW orhigher must have NDE (Non-Drive End) insulated bearingsinstalled to eliminate circulating bearing currents. Tominimize DE (Drive End) bearing and shaft currents, ensurethat the frequency converter, motor, driven machine, andmotor to the driven machine are grounded properly.Standard mitigation strategies:1. Use an insulated bearing.2. Apply rigorous installation procedures.2a Ensure that the motor and load motorare aligned.2b Strictly follow the EMC installationguideline.2c Reinforce the PE so the high frequencyimpedance is lower in the PE than theinput power leads.2d Provide a good high frequencyconnection between the motor and thefrequency converter, for example byusing shielded cable which has a 360°connection in the motor and thefrequency converter.2e Make sure that the impedance from thefrequency converter to the buildingground is lower than the groundingimpedance of the machine.2f Make a direct ground connectionbetween the motor and load motor.3. Lower the IGBT switching frequency.4. Modify the inverter waveform, 60° AVM vs.SFAVM.5. Install a shaft grounding system or use anisolating coupling.6. Apply conductive lubrication.7. Use minimum speed settings where possible.8. Ensure that the mains voltage is balanced toground.9. Use a dU/dt or sine-wave filter.3.4.17 Brake Resistor Temperature Switch• Torque: 0.5–0.6 Nm (5 in-lb)• Screw size: M3This input can be used to monitor the temperature of anexternally connected brake resistor. If the input between104 and 106 is established, the frequency converter tripson warning/alarm 27 Brake IGBT. If the connection is closedbetween 104 and 105, the frequency converter trips onwarning/alarm 27 Brake IGBT.Install a KLIXON switch that is normally closed. If thisfunction is not used, short circuit 106 and 104 together.• Normally closed: 104–106 (factory installedjumper)• Normally open: 104–105Terminal number Function106, 104, 105 Brake resistor temperature switch.Table 3.29 Brake Resistor Temperature Switch TerminalsCAUTIONMOTOR COASTINGIf the temperature of the brake resistor gets too highand the thermal switch drops out, the frequencyconverter stops braking and the motor starts coasting.175ZA877.10106NC104C105NOIllustration 3.47 Brake Resistor Temperature SwitchHow to Install Operating InstructionsMG34Q402 Danfoss A/S © 04/2016 All rights reserved. 513 3
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