Danfoss VLT AutomationDrive FC 301, Руководство по конструкции, Страница: 54 / 200

Basic standard Burst
IEC 61000-4-4
Surge
IEC 61000-4-5
ESD
IEC
61000-4-2
Radiated electromagnetic
field
IEC 61000-4-3
RF common
mode voltage
IEC 61000-4-6
Acceptance criterion B B B A A
Voltage range: 200-240 V, 380-500 V, 525-600 V, 525-690 V
Line
4 kV CM
2 kV/2 Ω DM
4 kV/12 Ω CM
— — 10 V
RMS
Motor 4 kV CM
4 kV/2 Ω
1) — — 10 V
RMS
Brake 4 kV CM
4 kV/2 Ω
1) — — 10 V
RMS
Load sharing 4 kV CM
4 kV/2 Ω
1) — — 10 V
RMS
Control wires 2 kV CM
2 kV/2 Ω
1) — — 10 V
RMS
Standard bus 2 kV CM
2 kV/2 Ω
1) — — 10 V
RMS
Relay wires 2 kV CM
2 kV/2 Ω
1) — — 10 V
RMS
Application and Fieldbus
options 2 kV CM
2 kV/2 Ω 1) — — 10 V
RMS
LCP cable
2 kV CM 2 kV/2 Ω
1)
— —
10 V
RMS
External 24 V DC
2 V CM
0.5 kV/2 Ω DM
1 kV/12 Ω CM
— — 10 V
RMS
Enclosure
— —
8 kV AD
6 kV CD
10V/m —
Table 5.5 EMC Immunity Form
1)
Injection on cable shield
5.2.4 Motor Insulation
Modern design of motors for use with frequency
converters have a high degree of insulation to account for
new generation high-efficiency IGBTs with high dU/dt. For
retrofit in old motors it is necessary to confirm the motor
insulation or to mitigate with dU/dt filter or if necessary a
sine-wave filter. dU/dt
For motor cable lengths
≤
the maximum cable length
listed in chapter 6.2 General Specifications , the motor
insulation ratings listed in Table 5.6 are recommended. 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 V < U
N
≤ 500 Reinforced U
LL
= 1600
500 V < U
N
≤ 600 Reinforced U
LL
= 1800
600 V < U
N
≤ 690 Reinforced U
LL
= 2000
Table 5.6 Motor Insulation
5.2.5 Motor Bearing Currents
To minimise bearing and shaft currents, ground the
following to the driven machine:
•
frequency converter
•
motor
•
driven machine
•
motor
Standard Mitigation Strategies
1. Use an insulated bearing.
2. Apply rigorous installation procedures
2a Ensure the motor and load motor are
aligned.
2b Strictly follow the EMC Installation
guideline.
2c Reinforce the PE so the high frequency
impedance is lower in the PE than the
input power leads.
2d 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.
System Integration
VLT
®
AutomationDrive FC 301/FC 302 Design Guide, 0.25-75 kW
52 MG33BF02 - Rev. 2013-12-20
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