BOSCH REXROTH
VT-SR7-1X/0/A4VS.250HSSO43A-1608
R978917126
Valve Amplifiers
Anal.contr., Q att valve ampl,card so
BOSCH REXROTH
MATERIAL: R978917126
SUMMARY: Anal.contr., Q att valve ampl,card so
Quantity in stock: 0
The amplifier operates with a push-pull output stage with bipolar transistors. The output of this output stage can be connected or disconnected by means of an enable circuit (relay K2). The enable is indicated by the LED "H2" on the front plate being illuminated. The switching voltage of all relays is defined by means of jumpers J12 and J13 to either 0 V or +UB (factory +UB).
The output stage consists of an I controller with connected dither signal generator. The amplitude of the dither signal is set by means of R7. The actuation of the pre-stage (current command value) is made via a PD controller. The actual current value returned is simultaneously indicated by the instrument on the front plate.
The oscillator/demodulator serves for position sensing. It is designed as pluggable printed circuit board the parameters of which are adapted to the respective size of the axial piston unit.
The PD controller is supplied the position command value and the position command value and the actual position value with the D share of the controller only affecting the actual value (velocity feedback).
The zero point can be set via R3 ("NP") from the front plate.
The required symmetric operating voltage +UB is protected against reversed polarity. If the board is not equipped with any voltage regulators for supply of the controller and position transducer electronics, an additional stabilized auxiliary voltage ±UM is required. The auxiliary voltage port is protected against reversed polarity up to a maximum current of 1 A.
As an option, the amplifier can be equipped with a PID controller (D share only affects the actual value). This controller can be used to superimpose a further control loop (e.g. for drive control). The P and D share can be set at the front plate. The PID controller fitting is customer-specific and therefore has to be specified in the order in plain text. These amplifiers receive a special type designation upon delivery.
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01 |
Valve amplifier for flow control with servo valves |
VT-SR7 |
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02 |
Component series 10 ... 19 (10 ... 19: unchanged installation and connection dimensions) |
1X |
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03 |
Without ±15 V voltage regulator |
0 |
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With ±15 V voltage regulator |
1 |
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04 |
For axial piston unit |
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NG40 |
A4VS40HS |
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Size 71 |
A4VS71HS |
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NG125 |
A4VS125HS |
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NG180 |
A4VS180HS |
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NG250 |
A4VS250HS |
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Size 35 |
A4VS355HS |
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NG500 |
A4VS500HS |
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NG750 |
A4VS750HS |
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NG1000 |
A4VS1000HS |
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05 |
Further details in the plain text |
* |
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01 |
02 |
03 |
04 |
05 |
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VT-SR7 |
‒ |
1X |
/ |
/ |
* |
General
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Component series |
1X | |
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Type of electronics |
Analog | |
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Design |
Euro-card |
Voltage supply
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Operating voltage |
with integrated voltage regulator |
V |
± 24 | ||
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Upper limit value |
V |
± 28 | |||
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Lower limit value |
V |
± 22 | |||
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without integrated voltage regulator |
V |
±24; ±15.0 | |||
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Upper limit value |
V |
±28; ±15.2 | |||
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Lower limit value |
V |
±22, ±14.8 | |||
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Current consumption |
max. |
Imax |
A |
0.15 | |
Analog inputs
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Command value |
Voltage 1) |
grounded on one side, first input |
Ucommand |
V |
0 … ±10 |
|
Voltage 2) |
grounded on one side, second input |
Ucommand |
V |
0 … ±10 | |
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position value 1) |
Voltage |
U |
V |
0 … ±10 | |
| 1) | RE = 50 kΩ |
| 2) | RE = 50 kΩ, J9 gesteckt |
Digital inputs
|
Enable 1) |
On (active) |
U |
V |
+24 (with J13); 0 (with J12) |
| 1) | RE = 700 Ω (relay) |
Analog outputs
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Valve flow command value |
UO |
-10 V ≙ +60 mA (J10 plugged) |
Solenoid outputs
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Solenoid current |
max. |
Imax |
mA |
60 |
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Dither signal |
340 ±5 % (Ipp = 3 mA) | |||
Other information
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Relay |
Pickup voltage |
U |
+24 (UB) | |
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Nominal voltage |
U |
V |
26 | |
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Response voltage |
U |
V |
13 | |
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Step-back voltage |
U |
V |
1.3 ... 6.5 | |
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Switching time |
t |
ms |
4 | |
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Coil resistance at 25 °C |
R |
Ω |
700 | |
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Reference voltage |
Potentiometer supply |
U |
V |
±15 ±2 % (Imax = 150 mA) |
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Anschlussart |
32-pole male multipoint connector, DIN 41612, design D | |||
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Ambient temperature range |
ϑ |
°C |
0 … 50 | |
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Storage temperature range |
ϑ |
°C |
-20 … 70 | |
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Weight |
m |
kg |
0.3 | |
For applications outside these parameters, please consult us!
The amplifier card may only be unplugged and plugged when de-energized.
Command values may only be switched via relays with gold-plated contacts (low voltage, low currents).
Card relays may only be switched (enable, controller change-over, reserve) using contacts with a load capacity of approx. 40 V; 50 mA.
Always shield command and actual value cables; connect shielding to ground (⊥) on the card-side, open at one side.
Do not lay signal lines close to power lines.
Recommendation:
Also shield the solenoid conductors (to ⊥ on one side).
Up to a length of 50 m, use cable type LiYCY 1.5 mm2, for longer lengths please ask.
Notice:
In case of pilot pressure at the adjustment device and if relay K2 is deactivated or the voltage supply is switched off, the pump can swivel to maximum setting.