Siemens SINUMERIK 840D Description Of Functions page 17

02.99
Table 1-1 Comparison of electrical and hydraulic drive systems
Criterion Electrical direct drive
Noise Noise produced by
linear guides
Acceleration Max. 45 g
characteristics
Drive cooling Mandatory
Sensitivity to High
ferromagnetic
swarf
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SINUMERIK 840D/SIMODRIVE 611 digital Descr. of Functions HLA Module (FBHLA) – 04.00 Edition
1.2 Comparison of electrical and hydraulic drive systems
Electrical drive with
Noise produced by servo-
motor and leadscrew
Max. 1 g
Required only at high
speeds
Low
Table 1-2 Analogy of characteristic data
Electrical
Speed
Speed
Current
DC link voltage
Power
Transistor/power section
motor
leadscrew
S
Flow through valve may
produce noise.
S
Pump noise on
hydraulic power unit.
Max. 2 g
Required in some cases, in
power unit only
Low
Speed
flow
System pressure
Flowrate @ Valve pressure difference
Valve
Drive cylinder
1 General
Hydraulic drive
Hydraulic
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