ABB ACS880-04 drive modules Application Manual page 20

20 Planning – basics
Symbol Name
P Motoring power
mot
P Average motoring
mot,ave
power
P Maximum motoring
mot,max
power
P Generating power
gen
P Average generating
gen,ave
power
P Maximum
gen,max
generating power
P Rectifier power
rec
P Average rectifier
rec,ave
power capacity
P Maximum rectifier
rec,max
power capacity
P Braking power
br
P Continuous braking
br,cont
power
P Maximum braking
br,max
power
Information
Power that the motors take from the common DC link
Average power that the motors take from the common DC link. See the
duty cycle diagram of the common DC link. Note: For long cycles
times, define P over the worst-case 3 minutes time window.
mot,ave
Maximum power that the motors take from the common DC link. See
the duty cycle diagram of the common DC link.
Power that the motors supply to the common DC link
Average power that the motors feed to the common DC link when they
are in generating mode (braking the load). See the duty cycle diagram
of the common DC link. Note: If you will use the brake choppers of the
drives in the system, determine P
seconds time window.
Maximum power that the motors feed to the common DC link when they
are in generating mode (braking the load). See the duty cycle diagram
of the common DC link.
Power that the drive input bridges (rectifiers) feed to the common DC
link. See section Selecting the drives which are connected to
AC power line on page 21
The drives that are connected to the AC power line can feed this
average power to the common DC link.
The drives that are connected to the AC power line can feed this power
to the common DC link at the maximum.
Surplus power that the brake resistors take from the common DC link.
(Alternatively: Power that the drive feeds to the AC power line if a
regenerative type of drive is in use.) See section
energy on page 25.
Continuous braking power that the brake resistors take from the
common DC link. The braking is continuous if the braking time exceeds
30 seconds.
Maximum braking power that the brake resistors take from the common
DC link. Brake choppers withstand this braking power for 5 second
within every minute.
over the worst-case 30
gen,ave
for the calculation instructions.
Handling the surplus