Bosch Rexroth RA2-1/10 - 5.3 Operating modes

RE95230-B/2021-12-01, BoschRexrothAG
About this product | Analog amplifier RA 15/48
5�3 Operating modes
The analog amplifier can be used in two operating modes:
• In toggling operation, there is an interlocked control of the proportional
solenoids.
• In parallel operation, two proportional solenoids can be controlled
independently of each other.
For 2 solenoids with interlocked control:
Setting range
Solenoid2
Setting range
Solenoid1
~0.06 x I
max
0 V 4.0 V 8.4 V U
command
I
min
~0.8 x I
max
I
max
I
Solenoid
Fig� 2: Toggling operation
For 2 solenoids with independent control
Setting range
I
Solenoid
I
min
I
max
~0.06 x I
max
~0.8 x I
max
4.0 V U
command
8.4 V
Fig� 3: Parallel operation
I
min
and I
max
control the minimum and maximum current that is applied to the
respective outputs (proportional solenoids).
I
min
basically corresponds to an offset (start current from which the solenoid
responds), I
max
to the gain (gradient)
As I
max
and I
min
are added, an output current of almost 200% of the solenoid
control current can be applied to the output of the analog amplifier if I
max
and
I
min
are both set to the highest value!
Therefore, aproportional solenoid could only react in avery small control range
and achieve almost maximum modulation with very low potentiometer setting.
Toggling operation
Parallel operation