Bosch Rexroth IndraDrive CsDrive System with HCS01 - Page 74

Table 3: Power requirements of the external loads
External load Power requirement
5 V encoder system
P = I
Encoder
× 5 V × 1.75
1), 5)
12 V encoder system
P = I
Encoder
x 12 V x 1.25
1), 5)
Load at digital output
P = I
Load
x U
N3
2), 4)
Motor holding brake
P = I
Brake
x U
N3
3), 4)
1)
I
encoder
: Current consumption of encoder system
2)
I
load
: Current consumption of external load
3)
I
brake
: Current consumption of motor holding brake
4)
U
N3
: Control voltage supply of drive controller
5)
The sum of the power consumption of all connected encoder
systems incl. encoder emulation cannot exceed 6 W.
Tab. 4-23: Power requirements of the external loads
Calculation formula
The total power consumption (P
N3
) from the 24 V control voltage of a drive
controller is calculated with:
P
N3
= P
basic device
+ ΣP
optional connection points
+ ΣP
external loads
Example of calculation
Component
HCS01.1E-W0028-A-03-B-ET-EC-PB-L4-NN-FW
Power requirement
Basic device HCS01.1E-W0028-A-03-B-ET-EC 17.3 W
Optional connection point PROFIBUS "PB" 1.1 W
Optional connection point STO/SBC "L4" 1.0 W
12 V encoder system of motor 12 V / 200 mA P = I
Encoder
× 12 V × 1.25 = 0.2 A × 15 V = 3.0 W
Motor holding brake 300 mA P = I
Brake
× U
N3
= 0.3 A × 24 V = 7.2 W
Load at digital output 250 mA P = I
Load
× U
N3
= 0.25 A × 24 V = 6.0 W
Total power consumption P
N3
= P
Basic device
+ ΣP
Optional connection points
+ ΣP
External loads
P
N3
= 17.3 W + 1.1 W + 1.0 W + 3.0 W + 7.2 W + 6.0 W = 35.6 W
Tab. 4-24: Example of calculation
Bosch Rexroth AG DOK-INDRV*-HCS01******-PR05-EN-P72/341
Rexroth IndraDrive CsDrive Systems with HCS01
Combining the individual components