10.03
2.3 Configuring the hydraulic drive
2-44
 Siemens AG, 2003. All rights reserved
SINUMERIK 840D/SIMODRIVE 611 digital, HLA Module (FBHLA) - 10.03 Edition
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.
°C
P
Q
M







 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
(GND)
Fig. 2-15 Overview of typical hydraulic power unit
Cooling
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