Danfoss VLT FC 100 Operating Instructions

3.3.14 Mains Disconnectors, 12-Pulse
Frame size Power Type
380-500 V
F9 P250 ABB OETL-NF600A
F9 P315 ABB OETL-NF600A
F9 P355 ABB OETL-NF600A
F9 P400 ABB OETL-NF600A
F11 P450 ABB OETL-NF800A
F11 P500 ABB OETL-NF800A
F11 P560 ABB OETL-NF800A
F11 P630 ABB OT800U21
F13 P710 Merlin Gerin NPJF36000S12AAYP
F13 P800 Merlin Gerin NPJF36000S12AAYP
525-690 V
F9 P355 ABB OT400U12-121
F9 P400 ABB OT400U12-121
F9 P500 ABB OT400U12-121
F9 P560 ABB OT400U12-121
F11 P630 ABB OETL-NF600A
F11 P710 ABB OETL-NF600A
F11 P800 ABB OT800U21
F13 P900 ABB OT800U21
F13 P1M0 Merlin Gerin NPJF36000S12AAYP
F13 P1M2 Merlin Gerin NPJF36000S12AAYP
3.3.15 Motor Insulation
For motor cable lengths ≤ the maximum cable length
listed in the General Specifications tables, 5.1.1 Cable
Lengths and Cross Sections, the following motor insulation
ratings are recommended 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 is
recommended to use a dU/dt or sine wave filter.
Nominal Mains Voltage [V] Motor Insulation [V]
U
N
≤ 420
Standard U
LL
= 1300
420 < U
N
≤ 500 Reinforced U
LL
= 1600
500 < U
N
≤ 600 Reinforced U
LL
= 1800
600 < U
N
≤ 690 Reinforced U
LL
= 2000
3.3.16 Motor Bearing Currents
All motors installed with FC 302 250 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 frequency converter, motor, driven
machine, and motor to the driven machine is required.
Standard Mitigation Strategies:
1. Use an insulated bearing
2. Apply rigorous installation procedures
- Ensure the motor and load motor are
aligned
- Strictly follow the EMC Installation
guideline
- Reinforce the PE so the high frequency
impedance is lower in the PE than the
input power leads
- 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
- Make sure that the impedance from
frequency converter to building ground
is lower that the grounding impedance
of the machine. This can be difficult for
pumps
- Make a direct earth connection between
the motor and load motor
3. Lower the IGBT switching frequency
How to Install
VLT
®
Automation Drive FC 300 12-Pulse
Operating Instructions High Power
MG34Q202 - VLT
®
is a registered Danfoss trademark 45
3
3

Danfoss VLT FC 100 Specifications

General

Brand	Danfoss
Model	VLT FC 100
Category	DC Drives
Language	English