ABB ACS880-604LC, Hardware Manual

Page: 75 / 104

￭ Definitions
Brake unit Example: ACS880-604LC-0800-7
Energy pulse that all the resistors of the unit put togeth-
er will withstand (400 s duty cycle). This energy will
heat the resistor elements from 40°C to the maximum
allowable temperature. E
R
Maximum peak current of the whole brake unit I
max
Maximum continuous power rating P
brcont
Maximum short-term (1 min every 10 mins) braking
power P
brmax
Resistance of specified resistors (per chopper module).
This is also the minimum allowed resistance for the
resistor assembly. R
Total brake resistor resistance of the whole brake unit R
tot
NBRW-
66
9
S
A
F
U
R
200
F5
00
S
A
F
U
R
200
F5
00
I
max
I
rms
R
tot
NBRW-
66
9
S
A
F
U
R
200
F5
00
S
A
F
U
R
200
F5
00
+
–
P
brmax
P
br
R R
P
cont
Duty cycle (10 s / 60 s)
Total rms current during a period of 10 seconds with
braking power
P
br
I
rms
Maximum braking power, allowed for 10 seconds every
60 seconds
„
10 s 50 s
P
br
0
P
br
Duty cycle (1 min / 5 min)
Total rms current during a period of 1 minute with
braking power
P
br
I
rms
Maximum braking power, allowed for 1 minute every 5
minutes
„
1 min 4 min
P
br
0
P
br
Brake current wave form
„
1 min or 10 s
4 min or 50 s
I
max
0
I
rms
Technical data 75