Danfoss VLT AQUA Drive FC 202 Design Manual page 85

Electrical Installation Con...
N355 N400
Cycle time 600
Nominal
(s)
braking
Current (%) 100
[45 °C
Braking 240
(113 °F)]
time (s)
Cycle time 300
Overload
(s)
braking
Current (%) 136
[45 °C
Braking 30
(113 °F)]
time (s)
Cycle time 600
Nominal
(s)
braking
Current (%) 100
[25 °C
Braking 240
(77 °F)]
time (s)
Cycle time 300
Overload
(s)
braking
Current (%) 136
[25 °C
Braking 30
(77 °F)]
time (s)
Table 10.11 Braking Capability, 380–480 V
N450 N500 N560 N630 N710 N800
Cycle 600 600
time (s)
Nominal
braking
Current 89 79
[45 °C
(%)
(113 °F)]
Braking 240 240
time (s)
Cycle 300 300
time (s)
Overload
braking Current 113 100
[45 °C
(%)
(113 °F)]
Braking 30 30
time (s)
Cycle 600 600
time (s)
Nominal
braking Current 89 79
[25 °C
(%)
(77 °F)]
Braking 240 240
time (s)
Cycle 300 300
time (s)
Overload
braking Current 113 100
[25 °C
(%)
(77 °F)]
Braking 30 30
time (s)
Table 10.12 Braking Capability, 525–690 V
Danfoss offers brake resistors with duty cycle of 5%, 10%,
and 40%. If a 10% duty cycle is applied, the brake resistors
are able to absorb brake power for 10% of the cycle time.
MG22B102
Design Guide
Power size
N450 N500 N560
600 600 600 600
70 62 56 80
240 240 240 240
300 300 300 300
92 81 72 107
30 30 30 30
600 600 600 600
92 81 89 80
240 240 240 240
300 300 300 300
113 100 72 107
10 10 30 30
Power size
600 600 600 600
63 63 71 63
240 240 240 240
300 300 300 300
80 80 94 84
30 30 30 30
600 600 600 600
63 63 71 63
240 240 240 240
300 300 300 300
80 80 94 84
30 30 30 30
Danfoss A/S © 05/2017 All rights reserved.
The remaining 90% of the cycle time is used to dissipate
excess heat.
NOTICE
Make sure that the resistor is designed to handle the
required braking time.
The maximum allowed load on the brake resistor is stated
as a peak power at a given intermittent duty cycle. The
brake resistance is calculated as shown:
2
U
dc
R Ω =
br P
peak
where
P =P xM [%]xη xη
peak motor br motor VLT
As can be seen, the brake resistance depends on the DC-
link voltage (U ).
dc
Size Brake Warning before
active
1) 810 V
380–480 V
525–690 V 1084 V
Table 10.13 FC 202 Brake Limits
Size Brake
active
1) 810 V
380–480 V
525–690 V 1084 V
Table 10.14 FC 202 Brake Limits
1) Power size dependent
NOTICE
Check that the brake resistor can handle a voltage of
410 V, 820 V, 850 V, 975 V, or 1130 V. Danfossbrake
resistors are rated for use on all Danfoss drives.
Danfoss recommends the brake resistance R
calculation guarantees that the drive is able to brake at the
highest braking torque (M
br(%)
be written as:
2
U x 100
dc
R Ω =
rec
P x M xη x η
motor ( % ) VLT motor
br
η is typically at 0.90
motor
η is typically at 0.98
VLT
For 200 V, 480 V, 500 V, and 600 V drives, R
braking torque is written as:
107780
200V : R = Ω
rec P
motor
464923
500V : R = Ω
rec P
motor
630137
600V : R = Ω
rec
P
motor
832664
690V : R = Ω
rec P
motor
[W]
Cut out
cut out (trip)
828 V 855 V
1109 V 1130 V
Warning before Cut out
cut out (trip)
828 V 855 V
1109 V 1130 V
. This
rec
) of 150%. The formula can
at 160%
rec
83
10 10