Connection; Internal Power Supply; External Power Supply - Siemens Sinumerik 840D Series Function Manual

04.00
10.03
2.4

Connection

2.4.1

Internal power supply

Comments
Connection and
power loss
calculation for the
NCU
2.4.2

External power supply

Requirements of
external 26.5 V
supply
 Siemens AG, 2003. All rights reserved
SINUMERIK 840D/SIMODRIVE 611 digital, HLA Module (FBHLA) - 10.03 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
SIMODRIVE modules (power supply or incoming supply module, possibly feed
modules and/or main spindle modules) and 840D. 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 make the calculation easier, each module has a weighting factor.
This can be found in Chapter 9 of the following reference material:
References: NC 60 catalog
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 hydraulic
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).
2 Configuration
2.4 Connection
2-45