Selecting The Main Power Supply - Fagor QC-PDS Hardware Manual

  Selection criteria
5.5
5.5.1
T. H5/13
5.
198
QC-PDS
HARDWARE
Ref.2003
· 190 ·

Selecting the main power supply

Calculation of the required power drawn from the power supply by the
FAGOR FKM axis feed synchronous servomotors.
Initially, considering the mechanical power provided by the servomotors:
Required power drawn from the main power supply by the QC-PDS system depending on the
mechanical power Pa provided by the motor.
FKM SYNCHRONOUS MOTORS
Mechanical power
Axes
1
GROUP I
From 0 2
to 2 kW
3
Synchronous
Sum of GROUP I
1
GROUP II
From 2.0 2
to 8.5 kW
3
Synchronous
Sum of GROUP II
1
GROUP III
From 8.5 kW
2
to 27 kW
3
Synchronous
Sum of GROUP III
Nr of synchronous FACTOR
motors per group kj
1.00
1
0.63
2
0.50
3
0.38
4
0.33
5
0.28
6
j = i, ii, iii.
where:
n: Maximum axis speed in the application (rpm)
nN: Motor rated speed (rpm)
Pa = Pcal·1.17· [n/nN] : Axis power (kW)
n nN Pa
Pcal
rpm rpm
kW kW
POWER SUM (kW)
where:
Pcal: motor power (kW) according to the motor
characteristics table.
1.17: coefficient combining the performance of the motor
(0.90) and that of the drive (0.95).
The servo set is divided in groups depending on their power
by applying to each one a simultaneity factor Ki, Kii, Kiii.
ki

*
+
kii

*
+
kiii

*
=
1