Bosch Bosch 25e User Manual Page 6

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6/12 Bosch Rexroth AG Hydraulics 3DREP; 3DREPE RE 29184/06.11
Block diagram of the integrated electronics (OBE) for type 3DREPE
PE
B
A
E
D
U
U
I
U
I
2
1
+ U
i
0 V
– U
i
U
U
U/I
Interface Integrated control electronics Valve
Command
value
Reference
potential
GND
Protective earth-
ing conductor
Supply
voltage:
24 V
Summing device
Ramp generator
Differential amplifier
Output stage
1)
Lock
Undervoltage
detection
Power supply
Step function
generator
Output stage
1)
1 Protective earthing conductor screwed to valve housing and cover
2 Ramp can be set from 0 to 5 s from the outside (T
up
T
down
)
1)
Output stages current-controlled
Device connector allocation Contact Signal with A1 Signal with F1
Supply voltage A 24VDC(u(t)=19.4to35V);I
max
= 2 A
B 0V
Reference (actual value) C Cannot be used
1)
Differential amplifier input D ±10V;R
e
>50kΩ 4to20mA;R
e
>100Ω
(command value) E Reference potential command value
F
Cannot be used
1)
PE Connected to cooling element and valve housing
1)
Slots C and F must not be connected!
Command value: Reference potential at E and positive command value (or 12 to 20 mA) at D result in pressure in A.
Reference potential at E and negative command value (or 12 to 4 mA) at D result in pressure in B.
With valves with 1 solenoid on side b (design A):
Reference potential at E and positive command value at D (4 to 20 mA) result in pressure in A.
With valves with 1 solenoid on side a (design B):
Reference potential at E and positive command value at D (4 to 20 mA) result in pressure in B.
Connection cable: Recommendation: Up to 25 m line length: Type LiYCY 5 x 0.75 mm
2
Up to 50 m line length: Type LiYCY 5 x 1.0 mm
2
External diameter 6.5 to 11 mm
Connect shield on PE only on the supply side.
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