Fagor QC-PDS - 5.6 Calculation for the input transformer power and cable section

 Selection criteria
SELECTING CRITERIA
Calculation for the input transformer power and cable section
5.
· 197 ·
Ref.2003
QC-PDS
HARDWARE
5.6 Calculation for the input transformer power and cable section
Calculation of the input transformer power for connection to the mains.
Calculation of the cable section for connection to the mains
T. H5 /21 Input transformer/auto-transformer power.
T. H5 /22 Selecting the power cable.
MAINS VOLTAGE
The QC-PDS system requires a line tension between 400 (1-10 %) V AC and 480 (1+10 %) V AC
TRANSFORMER
Transformer or auto-transformer power:
NOTE. When using an isolating transformer, the secondary must have a star connection and its mid point must be
accessible so it can be connected to ground. This means that the output voltage of the
transformer/autotransformer is maintained for the indicated apparent power. Note that if the system has an QC-
RPS-
 -  power supply, the rated power Pm of cell (2) of the previous expression corresponds to the sum of the
Pn's of all the asynchronous spindle motors of the system, whose value is the result of applying the expression
Pn=1.4·Pmax for each of them and then adding them all. Pmax will be the motor's maximum braking power and it
may be, in general, close to the power of the asynchronous spindle motor in S6. If it is a QC-PS-
 power supply,
cell (2) will register the value obtained from the tables T. H5/15 or T. H5/16T. H5/17 , accordingly.
[
1
+
2
]
*
1.05
kVA
=
4 kVA
POWER CABLE FOR MAINS CONNECTION
Vline from 400 V AC to 480 V AC Rated current through the mains cable conductor

MAINS POWER
QC-DR-X-XX DRIVE FOR FEED AXIS CONTROL:
QC-DR-X-XX DRIVE FOR SPINDLE CONTROL:
Power cable Power cable
In Amperes Reference In Amperes Reference
C
 13.1 MPC-4x1.5 54.0 < C  70.0 MPC-4x25
13.1 < C
 17.4 MPC-4x2.5 70.0 < C  86.0 MPC-4x35
17.4 < C
 23.0 MPC-4x4 86.0 < C  103.0 MPC-4x50
23.0 < C
 30.0 MPC-4x6 103.0 < C  130.0 MPC-1x70
30.0 < C  40.0 MPC-4x10 130.0 < C  156.0 MPC-1x95
40.0 < C
 54.0 MPC-4x16 156.0 < C  179.0 MPC-1x120
179.0 < C
 262.0 MPC-1x150
The purchase order must indicate the length of the cable.
4
(kW)
x 1000 / (3 · Vmains)
=
A

C
Rated current on FKM motors
=
A

C
Maximum current on FM7|FM9 motors
=
A

C
Conductor section calculated for the B2 installation method, according to UNE-EN 60204-1:2007.