Special Conditions; Manual Derating - Danfoss VLT FC 360 Design Manual

Specifications
controlled by frequency converters. The FC 360 also
complies with IEC 60034-17 regarding Norm motors
controlled by frequency converters
Measured values from lab tests:
Mains
Rise time
Cable voltage
length [m] [V] [μsec]
5 400 0.164
50 400 0.292
5 400 0.184
50 400 0.352
5 480 0.168
50 480 0.32
Table 6.7 FC 360, 2.2 kW T4
Mains
Cable voltage Rise time
length [m] [V] [μsec]
5 400 0.18
50 400 0.376
5 400 0.232
50 400 0.432
5 480 0.196
50 480 0.38
Table 6.8 FC 360, 5.5 kW T4
Mains
Rise time
Cable voltage
length [m] [V] [μsec]
5 400 0.166
50 400 0.372
5 400 0.188
50 400 0.36
5 480 0.168
50 480 0.352
Table 6.9 FC 360, 7.5 kW T4
Mains
Cable voltage Rise time
length [m] [V] [μsec]
5 400 0.224
50 400 0.392
5 400 0.332
50 400 0.456
5 480 0.236
50 480 0.408
Table 6.10 FC 360, 15 kW T4
®
VLT AutomationDrive FC 360 Design Guide
dU/dt
Upeak
[kV] [kV/μsec]
0.98 5.4
1.04 2.81
1.2 5.27
1.42 3.19
1.09 5.27
1.23 3.08
Upeak dU/dt
[kV] [kV/μsec]
0.86 3.84
0.96 2.08
1.03 3.54
1.43 2.64
0.97 3.98
1.19 2.5
dU/dt
Upeak
[kV] [kV/μsec]
0.992 4.85
1.08 2.33
1.19 5.24
1.46 3.25
1.1 5.2
1.25 2.85
Upeak dU/dt
[kV] [kV/μsec]
0.99 3.54
1.07 2.19
0.855 2.07
1.51 2.65
1.14 3.87
1.33 2.61
®
MG06B202 - VLT is a registered Danfoss trademark
Mains
Rise time
Cable voltage
length [m] [V] [μsec]
5 400
50 400
5 480
50 480
Table 6.11 FC 360, 22 kW T4

6.7 Special Conditions

Under some special conditions, where the operation of the
frequency converter is challenged, derating must be taken
into account. In some conditions, derating must be done
manually.
In other conditions, the frequency converter automatically
performs a degree of derating when necessary. This is
done in order to ensure the performance at critical stages
where the alternative could be a trip.

6.7.1 Manual Derating

Manual derating must be considered for:
•
Air pressure – for installation at altitudes above 1
km
•
Motor speed – at continuous operation at low
RPM in constant torque applications
•
Ambient temperature – above 45 °C (for some
types above 50 °C), for details, see Table 6.12 and
Table 6.13.
Frame size Power size Max. output current
[kW] at 45 °C
0.37
0.55
0.75
J1
1.1
1.5
2.2
3
J2 4
5.5 12.0
J3 7.5 15.5
11 23.0
J4
15 31.0
18.5 37.0
J5
22 42.5
Table 6.12 Derating at 380 V
dU/dt
Upeak
[kV] [kV/μsec]
0.98 2.8
1.04 2.4
1.09 2.6
1.23 2.6
Max. output current
at 50 °C
1.2 1.2
1.7 1.7
2.2 2.2
3.0 3.0
3.7 3.0
5.3 4.1
7.2 7.2
9.0 9.0
10.2
13.1
23.0
26.0
37.0
40.0
75
6 6