Enclosure size
Power and voltage
Type
E1/E2
P315 380-480 V & P450-P630 525–690 V
ABB OT600U03
E1/E2
P355-P450 380–480 V
ABB OT800U03
F3
P500 380-480 V & P710-P800 525–690 V
Merlin Gerin NPJF36000S12AAYP
F3
P560-P710 380–480 V & P900 525–690 V
Merlin Gerin NRK36000S20AAYP
F4
P800-P1M0 380–480 V & P1M0-P1M4 525–690 V
Merlin Gerin NRK36000S20AAYP
Table 4.25 Line Power Disconnectors Enclosure Sizes E and F
Enclosure size
Power and voltage
Type
F3
P500 380–480 V & P710-P800 525–690 V
Merlin Gerin NPJF36120U31AABSCYP
F3
P560-P710 380–480 V & P900 525–690 V
Merlin Gerin NRJF36200U31AABSCYP
F4
P800 380–480 V & P1M0-P1M4 525–690 V
Merlin Gerin NRJF36200U31AABSCYP
F4
P1M0 380–480 V
Merlin Gerin NRJF36250U31AABSCYP
Table 4.26 Circuit Breakers Enclosure Size F
Enclosure size
Power and voltage
Type
F3
P500-P560 380–480 V & P710-P900 525–690 V
Eaton XTCE650N22A
F3
P 630-P710 380–480 V
Eaton XTCEC14P22B
F4
P800-P1M0 380–480 V & P1M0-P1M4 525–690 V
Eaton XTCEC14P22B
Table 4.27 Line Power Contactors Enclosure Size F
4.1.15 Motor Insulation
For motor cable lengths
≤
the maximum cable length
listed in
chapter 7 General Specifications
, the recommended
motor insulation ratings are in
. The peak voltage
can be up to twice the DC link voltage, 2.8 times the AC
line voltage, due to transmission line effects in the motor
cable. If a motor has a lower insulation rating, use a dU/dt
or sine-wave filter.
Nominal AC line 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
Table 4.28 Motor Insulation at Various Nominal AC Line
Voltages
4.1.16 Motor Bearing Currents
For motors with a rating of 110 kW (150 hp) or greater
that operate via adjustable frequency drives, use NDE
(Non-Drive End) insulated bearings to eliminate circulating
bearing currents due to the physical size of the motor. To
minimize DE (Drive End) bearing and shaft currents proper
grounding of the adjustable frequency drive, motor, driven
machine, and motor to the driven machine is required.
Although failure due to bearing currents is rare, if it occurs,
use the following mitigation strategies.
Standard mitigation strategies:
•
Use an insulated bearing.
•
Apply rigorous installation procedures:
-
Ensure that the motor and load motor
are aligned.
-
Strictly follow common EMC installation
guidelines.
-
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
adjustable frequency drive by shielded
cable. The cable must have a 360
°
connection in the motor and adjustable
frequency drive.
-
Ensure that the impedance from
adjustable frequency drive to building
ground is lower than the grounding
impedance of the machine. Make a
direct ground connection between the
motor and load motor.
•
Apply conductive lubrication.
Electrical Installation
VLT
®
HVAC Drive FC 102
54
Danfoss A/S © 08/2014 All rights reserved.
MG11F522
4
4
Summary of Contents for VLT HVAC Drive FC 102
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