ID 442426.04
57
WE KEEP THINGS MOVING
Technical data
4
Manual SD6
Dynamic movements of the connected motors are possible in the permitted
range, see 4.2.2 Power board.
The following applies for the total of the input currents of the connected drive
controller:
•
If all the drive controllers supplied with power have the same power, the
total of maximum mains-side input currents can be calculated using the
formula
I
mains, max
= 0.8 · n
supply
· I
mains, individual device
•
If all drive controllers supplied with power do not have the same power, the
total of the input current can be calculated by multiplying the input current
of the smallest drive controller supplied with power by the number of all
drive controllers supplied with power:
I
mains,max
= 0.9 · n
supply
· I
mains, individual device, min
To prevent current asymmetries, all drive controllers supplied with power that
have different power must have the same fuse protection, which must also be
equivalent to the drive controller with the lowest power.
Current-carrying capacity of the copper wires
"DC rails" connect the DC link capacitors of the drive controllers with each
other. These are copper rails that are mounted with corresponding holding
clamps and must have a cross-sectional dimension of 5 x 12 mm.
The maximum permitted current-carrying capacity of the copper rails is 200 A.
Minimum time between two mains power-on processes
The drive controllers have temperature-dependent resistors in the charging
circuit to prevent the devices from being destroyed when the mains current is
switched after an error – such as a short-circuited DC intermediate circuit,
wiring error, etc. When the DC intermediate circuit is being charged, the
resistors heat up. To prevent an overload, it is essential to maintain a minimum
amount of time between two power-on processes.
Depending on the DC link circuit capacity in the system being charged, the
minimum time between two mains power-on processes can be determined by
the maximum charging capacity of the drive controllers connected to the mains
(K factor).
The times specified below are worst-case values for a regularly recurring
power-on with full discharge of the DC link circuit capacity.
These times are reduced for a single instance of repeated power-on, or if the
DC link circuit capacities remain entirely or partially charged.
Calculation example
Three SD6A16 drive controllers are connected and two of them are connected
to the mains. The K factor can be calculated according to the formula
previously noted as follows:
The minimum time between two mains power-on processes is three minutes
(see table).
AC-supplied drive
controllers
Factor K
Minimum time between
two mains power-on
processes [min]
Size 0
≤
0.5
1
≥
0.5
2
Sizes 1, 2
≤
0.427
1
0.428 – 0.570
2
0.571 – 0.712
3
0.713 – 0.854
4
> 0.854
5
Size 3
0.5
1680
F
2810
F
---------------------
0 598
=
=