KEB combivert R6-S - Page 155

Project design
© KEB, 2008-02 COMBIVERT R6-S Page 6.1 - 5
6
6.1.2 Dimensioning power supply and regenerative units
PM Mechanical power
ηM
Motorefciency IDC DC output current R6-S
PMmax Max. mechanical power ηG Gearboxefciency IDCmax Max. DC output current R6-S
t1 Overload time ηFU Inverterefciency ILG DC load regenerative current
t Last cycle ILM DC load motoric current ILGmax Max. DC load regenerative current
n Number of R6-S ILMmax Max. DC load motoric current CZK_all DC link capacity of all frequency
inverters
CZK_max Max. connecting capacity R6-S
Dimensioning of the power supply and
regenerative unit
Only
regeneration ?
Decouple R6-S
Acquire:
PM, PMmax,t1,T,ηM, ηG, ηFU
Calculate:
ILG, ILGmax
IDCmax > ILGmax
Choose bigger unit or parallel
processing of R6-S
(n •IDC,n•IDCmax)
t1 > 60 s
Regenerative unit capable
T < 300 s
IDC > ILG
yes
yes
no
yes
no
yes
no
yes
no
Acquire:
CZK_all
CZK_all > CZK_max
Acquire:
PM, PMmax,t1,T,ηM, ηG, ηFU
Calculate:ILM, ILMmax
IDCmax > ILMmax
Choose bigger unit or parallel processing of
R6-S
(n •IDC,n•IDCmax)
t1 > 60 s
T < 300 s
IDC > ILM
yes
no
yes
no
yes
no
yes
no
Calculate:ILG, ILGmax
I
DCmax > ILGmax
IDC > ILG
yes
no
yes
no
Choose bigger unit or parallel processing of
R6-S
(n •IDC,n•IDCmax)
Power supply / regenerative unit
capable
Bridgeover ext. load-
shunt with contactor
(special unit)
no yes
no