supply (P
Diss_cont
= power dissipation which KCU generates by converting the
24 V voltage to 42 V; depends on the load at the 42V supply.).
Configure the 24V supply for the power consumption of KCU and
the load-dependent inrush current.
Take into account that other loads (e.g. HMV, HCS) are operated
at the same 24V supply.
KCU output X53 load:
P
42V
KCU load at X53
f
cable
1.3 (correction factor for losses on the hybrid cable)
n Number of KSM/KMS without holding brake
m Number of KSM/KMS with holding brake
P
N3
KSM/KMS power consumption
Fig. 7-4: Load X53
KCU power consumption from 24V supply:
P
N3 (KCU)
KCU power consumption
f
SMPS
1.2 (correction factor for KCU power supply unit losses)
P
42V
KCU load at X53
Fig. 7-5: KCU power consumption from 24V supply
The 24V supply has to make available the inrush current
generated when each KCU drive connection box is switched on.
The inrush current depends on the power consumption P
N3 (KCU)
(see calculation above):
● P
N3(KCU)
≤ 288 W
Inrush current I
N3_EIN
= 10 A
● 288 W < P
N3(KCU)
Inrush current I
N3_EIN
= P
N3(KCU)
/U
N3
The holding brakes integrated in KSM have no effect on the
inrush current of KCU.
IndraDrive Mi Drive Systems with KCU02, KSM02,
KMS02/03, KMV03, KNK03, KLC03
221/407
Notes on project planning
R911335703_Edition 04 Bosch Rexroth AG
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