Siemens Sinumerik 840D Series Function Manual page 44

2 Configuration
2.3 Configuring the hydraulic drive
Cooling
2-44
Since considerable power losses that cannot be compensated for solely
through oil reservoir dissipation occur when the flow is throttled via the control
edges on the valve, additional oil/air or oil/water heat exchangers must be pro-
vided in most cases.


P


Variable displacement pump with pressure regulator

Pressure-relief valve (protection)

Accumulator with fail-safe circuit

Filters in pressure line

Filters in return line

Oil/water heat exchanger
Oil reservoir
Fig. 2-15 Overview of typical hydraulic power unit
SINUMERIK 840D/SIMODRIVE 611 digital, HLA Module (FBHLA) - 10.03 Edition


Q

M
(GND)


 Siemens AG, 2003. All rights reserved
10.03
°C