Danfoss ADAP-KOOL AKD 102 User Manual

4.1.13 Mains Disconnectors - Frame Size D
Frame size Power & Voltage Type
D1/D3 P110-P132 380-480V & P110-P160 525-690V ABB OETL-NF200A
D2/D4 P160-P250 380-480V & P200-P400 525-690V ABB OETL-NF400A
4.1.14 Motor Insulation
For motor cable lengths ≤ the maximum cable length listed in the General
Specifications tables the following motor insulation ratings are recom-
mended because the peak voltage can be up to twice the DC link voltage,
2.8 times the mains voltage, due to transmission line effects in the motor
cable. If a motor has lower insulation rating it recommended to use a du/
dt or sine wave filter.
Nominal Mains Voltage Motor Insulation
U
N
≤ 420 V Standard U
LL
= 1300 V
420 V < U
N
≤ 500 V Reinforced U
LL
= 1600 V
500 V < U
N
≤ 600 V Reinforced U
LL
= 1800 V
600 V < U
N
≤ 690 V Reinforced U
LL
= 2000 V
4.1.15 Motor Bearing Currents
All motors installed with 110 kW or higher power drives should have NDE (Non-Drive End) insulated bearings installed to eliminate circulating bearing
currents. To minimize DE (Drive End) bearing and shaft currents proper grounding of the drive, motor, driven machine, and motor to the driven machine
is required.
Standard Mitigation Strategies:
1. Use an insulated bearing
2. Apply rigorous installation procedures
- Strictly follow the EMC Installation guideline
- Provide a good high frequency connection between the motor and the frequency converter for instance by screened cable which has
a 360° connection in the motor and the frequency converter
- Provide a low impedance path from frequency converter to building ground/earth and from the motor to building ground/earth. This
can be difficult for pumps
- Make a direct earth connection between the motor and load machine
- Reinforce the PE so the high frequency impedance is lower in the PE
- Ensure the motor and load motor are aligned
3. Lower the IGBT switching frequency
4. Modify the inverter waveform, 60° AVM vs. SFAVM
5. Install a shaft grounding system or use an isolating coupling between motor and load
6. Apply conductive lubrication
7. If the application allows, avoid running at low motor speeds by using the minimum speed settings of the drive .
8. Try to ensure the line voltage is balanced to ground. This can be difficult for IT, TT, TN-CS or Grounded leg systems
9. Use a dU/dt or sine wave filter
4 Electrical Installation ADAP-KOOL
®
Drive AKD 102 High Power
42 MG.11.O1.02 - ADAP-KOOL
®
is a registered Danfoss trademark
4

Danfoss ADAP-KOOL AKD 102 Specifications

General

Brand	Danfoss
Model	ADAP-KOOL AKD 102
Category	Controller
Language	English