Lenze DSD - Manual (Page 119)

Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
119
7 Applications
7.8 Hoist drive without counterweight
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7.8.2 Data for the entry
7.8.2.1 Diameter of cable drum
7.8.2.2 Reeving, load
Cable guided hoists have both simple- and multi-cable guides via guide pulleys, so-called reevings
(pulley block principle). For multi-cable guides, the circumferential speed of the cable drum is an in-
teger multiple of the lifting speed. Here, the required torque on the cable drum decreases by the
reeving factor N
L
and the speed increases by this factor.
The reeving has no impact on the drive power (except for highly dynamic movements).
[7-92] Reeving
7.8.2.3 Mass of hoisting cage
7.8.2.4 Efficiency of the cable drum
Symbol Description
d
Cor
Diameter of the cable drum without cable
Symbol Description
N
L
The reeving of the cable to the payload.
• The reeving is the ratio of cable velocity of the cable drum to the lifting speed of the payload.
 Reeving for a cable guide via guide pulleys. The reeving factor N
L
in this case is 4 ().
Symbol Description
m
Cbn
Mass of the hoisting cage for the payload
• Value can be entered directly or calculated using the mass calculator.
Mass calculator ( 405)
Symbol Description
η
Cor
Efficiency limited by friction between cable drum and cable