Wiring - Siemens SINUMERIK 840D Description Of Functions

2 Configuring

2.4 Wiring

2.4 Wiring
2.4.1 Internal power supply
Comments
Connection and
power loss
calculation for
NCU
2.4.2 External power supply
Requirements of
external 26.5 V
supply
2-46
SINUMERIK 840D/SIMODRIVE 611 digital Descr. of Functions HLA Module (FBHLA) – 04.00 Edition
Note
The NC CPU is supplied by the SIMODRIVE power supply via the device bus.
No provision has been made for any other type of voltage supply and failure to
use the supply provided could damage the unit.
The HLA module is integrated as a single module into the network of 840D and
SIMODRIVE modules (power supply or incoming supply module, possibly feed
modules and/or main spindle modules). The power supply is fed in via the
device bus.
The total power requirement for the entire network must be calculated. This
must not exceed the power supplied by the power supply module.
To facilitate the calculation, each module has a weighting factor.
This can be found in Chapter 9 of the following reference material:
References: /NC60.1/, Catalog SINUMERIK & SIMODRIVE
The sum of electronic and control points must not be larger than stated in the
data sheet of the power supply module.
The purpose of the external power supply is to switch and supply the
components
S
closed-loop proportional valves
S
shutoff valves
S
pressure sensors
via the closed-loop control.
In principle, stabilized or unstabilized power supplies and switched-mode or
in-phase-controlled supplies can be used.
The following points must, however, be noted:
S
The required voltage tolerance can only be achieved in practice with stabi-
lization and preferably switched for the existing currents. The ripple associ-
ated with an unstabilized power supply may cause tripping at the lower mon-
itoring threshold.
S
The stabilization has 24000 µF input capacity per module, which can best
be charged up with a stabilized power supply (with current limitation).
 Siemens AG 2000. All rights reserved
04.00
02.99