Motor Insulation; Motor Bearing Currents - Danfoss VLT AQUA High Power Operation Instructions Manual

3 How to Install
3.6.15 Mains disconnectors - frame size D, E and F
Frame size
D1/D3
D2/D4
E1/E2
E1/E2
3 F3
F3
F4
3.6.16 F frame circuit breakers
Frame size
F3
F3
F4
F4
3.6.17 F frame mains contactors
Frame size
F3
F3
F3
F4
F4

3.6.18 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.

3.6.19 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
68
Power & Voltage
P110-P132 380-480V & P110-P160 525-690V
P160-P250 380-480V & P200-P400 525-690V
P315 380-480V & P450-P630 525-690V
P355-P450 380-480V
P500 380-480V & P710-P800 525-690V
P560-P710 380-480V & P900 525-690V
P800-P1M0 380-480V & P1M0-P1M2 525-690V
Power & Voltage
P500 380-480V & P710-P800 525-690V
P630-P710 380-480V & P900 525-690V
P800 380-480V & P1M0-P1M2 525-690V
P1M0 380-480V
Power & Voltage
P500-P560 380-480V & P710-P900 525-690V
P630 380-480V
P710380-480V
P1M0 525-690V
P800-P1M0 380-480V & P1M2 525-690V
MG.20.P3.02 - VLT
VLT AQUA High Power Operation Instructions
Type
ABB OETL-NF200A
ABB OETL-NF400A
ABB OETL-NF600A
ABB OETL-NF800A
Merlin Gerin NPJF36000S12AAYP
Merlin Gerin NRK36000S20AAYP
Merlin Gerin NRK36000S20AAYP
Merlin Gerin NPJF36120U31AABSCYP
Merlin Gerin NRJF36200U31AABSCYP
Merlin Gerin NRJF36200U31AABSCYP
Merlin Gerin NRJF36250U31AABSCYP
Type
Eaton XTCE650N22A
Eaton XTCE820N22A
Eaton XTCEC14P22B
Eaton XTCE820N22A
Eaton XTCEC14P22B
Nominal Mains Voltage
≤ 420 V
U
N
≤ 500 V
420 V < U
N
500 V < U ≤ 600 V
N
≤ 690 V
600 V < U
N
®
is a registered Danfoss trademark
Type
Motor Insulation
Standard U = 1300 V
LL
Reinforced U = 1600 V
LL
Reinforced U = 1800 V
LL
Reinforced U = 2000 V
LL