Danfoss VLT AutomationDrive FC 300, Руководство по конструкции, Страница: 88 / 296

Power size Cable length
[m] AC line voltage
[V] Rise time
[
µ s]
Peak voltage
[V] dU/dt
[V/
µ s]
125–175 hp [90–132 kW]/
525–690 V 150 690 0.36 2135 2.197
225–425 hp
[160–315 kW]/
525–690 V 150
690
1) 0.46 2210 1.744
Table 4.18 dU/dt D-frame 525–690 V
1)
With Danfoss dU/dt filter
Power size Cable length
[m] AC line voltage
[V] Rise time
[
µ
s]
Peak voltage
[V] dU/dt
[V/
µ
s]
475–1600 hp
[355–1200 kW]/525–690 V 30 690 0.57 1611 2261
30 575 0.25 2510
30
690
1) 1.13 1629 1150
Table 4.19 dU/dt E- and F-frames 525–690 V
1)
With Danfoss dU/dt filter.
4.7 Special Conditions
This section provides detailed data regarding the operating of the adjustable frequency drive in conditions that require
derating. In some conditions, derating must be done manually. In other conditions, the adjustable frequency drive performs
a degree of automatic derating when necessary. This is done to ensure proper performance at critical stages where the
alternative could be a trip.
4.7.1 Manual Derating
Manual derating must be considered for:
•
Air pressure – relevant for installation at altitudes above 3300 ft [1 km]
•
Motor speed – at continuous operation at low RPM in constant torque applications
•
Ambient temperature – relevant for ambient temperatures above 122 °F [50
°
C]
Selection Design Guide
86 Danfoss A/S © Rev. 2014-02-10 All rights reserved. MG34S222
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