Danfoss VLT FC 103, Руководство по конструкции

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Basic standard
Burst 2)
IEC 61000-4-42)
Surge 2)
IEC 61000-4-5
ESD 2)
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
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
10 V/m —
Table 3.7 EMC Immunity Form
1) Injection on cable screen.
2) Values typically obtained by testing.
3.2.5 Motor Insulation
Modern 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, confirm the motor insulation or mitigate with
dU/dt filter or, if necessary, a sine-wave filter.
For motor cable lengths
≤
the maximum cable length
listed in chapter 7 Specifications , the motor insulation
ratings listed in Table 3.8 are recommended. If a motor has
lower insulation rating, 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 3.8 Motor Insulation
3.2.6 Motor Bearing Currents
To minimise bearing and shaft currents, ground the
following to the driven machine:
•
Frequency converter
•
Motor
•
Driven machine
Standard mitigation strategies
1. Use an insulated bearing.
2. Apply rigorous installation procedures:
2a Ensure that the motor and motor load
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.
2e Make sure that the impedance from
frequency converter to building ground
is lower that the grounding impedance
System Integration
VLT
®
Refrigeration Drive FC 103
44 Danfoss A/S © 08/2015 All rights reserved. MG16G202
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