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BOSCH REXROTH
VT-VRPA1-100-1X/SO43A-466B
R978022097
Valve Amplifiers

Flow-cont.valve ampl, cardversion 1X

$2,180.00

BOSCH REXROTH

MATERIAL:  R978022097

SUMMARY:  Flow-cont.valve ampl, cardversion 1X

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Limitation and position controller

From the output of the ramp generator [3], the command value voltage reaches the "Gw" potentiometer which is accessible through the front plate and serves as attenuator. It can also be used to set the maximum flow of the valve. The downstream limiter [7] limits the command value to 105 % or –5 % (e.g. at excessive command value voltage or by adjustment of the potentiometer for zero point "Zw" and basic value "Gw") to prevent the valve spool from hitting the mechanical end positions. The output signal of the limiter [7] is the position command value which is supplied to the PID controllers [8] and via an output stage [17] also to measuring socket "w" on the front plate of the card as well as to port 28c at the connector strip X1 (command value after ramp and limiter). A voltage of +6 V at command value measuring socket "w" corresponds to a command value of +100 %. The PID controller has been especially optimized for DBETR and FRE valves. In the controller, the position command value and the actual position value are compared; in case of a difference, a corresponding control output is forwarded to the current output stage [13] the output signal of which controls the proportional solenoid of valve.

Position sensing

The position transducer electronics consist of an oscillator [14] with downstream driver [15] for controlling the inductive position transducer and a demodulator [16] for analyzing the position transducer signal (actual value). The oscillator frequency is approx. 2.5 kHz. The inductive position transducer must be connected as throttle circuit with mid sensing. The position transducer electronics have been adjusted at the factory. Very long or capacitive position transducer lines may require readjustment of the zero point (via potentiometer "Zx"). The actual value (corresponds to the valve spool position) can be measured at the actual value measuring socket.

Notice:

The actual value signal is output in inverted form as compared to the command value. A path of 100 % corresponds to –6 V at the actual value measuring socket and at port 32a of the connector strip X1.

Enable input

With a signal of > 10 V at enable input 20a, the output stage and I controller are enabled (indication by the yellow LED at the front plate). By setting jumper X3, these are independently and permanently enabled by the signal at the enable input. The switching input will then be ineffective.

 

[ ] = Assignment to the block diagram

When using an external time potentiometer, the internal potentiometers for the ramp times must be set to maximum (voltages at the "t1" and "t2" measuring sockets approx. 20 mV). The maximum ramp time is reduced as the resistance value of the external potentiometer is switched in parallel to that of the internal potentiometer (approx. 500 kΩ). In this case, the ramp times for upwards and downwards ramp cannot be set separately.

By applying a voltage >10 V to the "Ramp off" switching input or setting the plug-in jumper X4, the ramp time is set to its minimum value (approx. 15 ms). The switching input will then be ineffective. The minimum value is then valid for both directions.

Calculation of the ramp times

Jumper X9 plugged (ramp time "short")

 

technical illustration-VT-VRPA1-100-1X/SO43A-466B-Flow-cont.valve ampl, cardversion 1X

Jumper X8 plugged (ramp time "long")

 

technical illustration-VT-VRPA1-100-1X/SO43A-466B-Flow-cont.valve ampl, cardversion 1X

The following applies:
U = Voltage in volt at measuring socket "t1" or "t2"
t = Ramp time in seconds for upwards and downwards ramp

 

Ramp function

The down-stream ramp generator [3] generates a ramp-shaped output signal from a given step-shaped input signal. The time constants of the output signal (ramp times) can be adjusted using the "t1" (upwards ramp) and "t2" (downwards ramp) potentiometers accessible through the front plate. The specified maximum ramp time refers to a command value step of 100 % and may be approx. 5 s or 50 s depending on the jumper setting (X8, X9). If a command value step of less than 100 % is switched to the ramp generator input [3], the ramp time will be correspondingly shorter. The current ramp time can be checked at the "t1" (upwards ramp) and "t2" (downwards ramp) measuring sockets.

For detailed information, refer to Technical data

Power supply unit

After application of the operating voltage, the internal power supply unit [6] creates a voltage of ±9 V as compared to measurement zero (M0). Measured against load zero (L0), it is raised by +9 V. The voltages +9 V and –9 V (–9 V corresponds to L0) are fed to the connector strip X1 and can be used externally (e.g. for a command value potentiometer). The maximum load capacity is 25 mA.

Ready for operation

The amplifier card is ready for operation if the following conditions are met:

Operating voltage > 20 V

No asymmetry of internal supply voltages

No cable break in position transducer lines

no short-circuit in solenoid conductors

The "ready for operation" status is indicated by the green LED on the front plate.

Command value

The command value voltage is either specified directly, by the regulated voltage +9 V of the power supply unit [6] or via an external command value potentiometer. For the "Command value 1" input, +9 V ≙ +100 % and for the "Command value 2" input, +6 V ≙ +100 %. The reference point for the command value inputs 1 and 2 is always M0 (18ac). Command value input 3 is a differential input [1] (0 to +10 V). It can be configured by setting jumpers as current input (0 to 20 mA or 4 to 20 mA). If the command value is specified by external electronics with a different reference potential, the differential input has to be used.

When disconnecting or connecting the command value voltage, it has to be ensured that both signal lines are in each case separated from or connected with the input. Before they are forwarded, all command values will be added up according to their absolute value and their sign [2]. Using the "Zw" potentiometer, offset voltages in the command value branch can be compensated.

External time potentiometer

technical illustration-VT-VRPA1-100-1X/SO43A-466B-Flow-cont.valve ampl, cardversion 1X

External command value potentiometer (with 9 V command value input)

technical illustration-VT-VRPA1-100-1X/SO43A-466B-Flow-cont.valve ampl, cardversion 1X

01

Valve amplifier for proportional pressure valves with electrical position feedback, analog, euro-card format

VT-VRPA1

02

For valves: DBETR-1X

100

03

Component series 10 ... 19 (10 ... 19: unchanged installation and connection dimensions)

1X

04

Version: standard

V0

05

Option: standard

0

06

Further details in the plain text

*

01

02

03

04

05

06

VT-VRPA1

100

1X

/

V0

/

0

/

*

When replacing amplifier VT 5003, VT 5004 or VT 5010, the blind plate 4TE/3HE, material no. R900021004, must be ordered separately for the rack mounting.

Position transducer

Oscillator frequency

f

kHz

2.5 ±10 %

Supplementary information

Reference voltage 1)

Potentiometer supply

U

V

±9 (Imax = 25 mA)

Anschlussart

32-pole male multipoint connector, DIN EN 60603-2, design D

Ambient temperature range

ϑ

°C

​0 … ​50

Storage temperature range

ϑ

°C

-25 … ​70

Weight

m

kg

0.15
1) With raised zero point

Measuring sockets

Command value

"w"

Uw

V

0 ... 6 (Ri = 1 kΩ)

Ramp time

“down"

Udown

V

0.02 ... 5

“up"

Uup

V

0.02 ... -5 s

additional notices

Ramp up, short: 0.02 V ≙ 5 s and 5 V ≙ 0.02 s,
long: 0.02 V ≙ 50 s and 5 V ≙ 0,2 s
Ramp down, short:
-0.02 V ≙ 5 s and -5 V ≙ 0.02 s,
long: -0.02 V ≙ 50 s and -5 V ≙ 0.2 s

Actual value 1)

"x"

Ux

V

0 ... -6
1) Ri = 1 kΩ

Anzeigen

LED display

Green 1

Ready for operation

Yellow 1

Enable

Adjustment options

Zero point calibration information

-5 ... 30 %

Amplitude attenuator

for command value

%

0 ... 105

Ramp time up/down

Ramp 1

t

s

0.02 … 5

Ramp 2

t

s

0.2 … 50

Solenoid outputs

Solenoid current

max.

Imax

A

2.2

Coil resistance at 20°C

R(20)

Ω

10

Clock frequency

f

Hz

1.5 kHz

Analog inputs

Command value

Voltage (differential input)

U

V

​0 ... ​10

Voltage 1)

grounded on one side, first input

Ucommand

V

​0 … ​9

Voltage 1)

grounded on one side, second input

Ucommand

V

​0 … ​6

Current

I

mA

4 … 20

Current

Input resistance

R

Ω

100

Alternative

Current

I

mA

0 … 20

Current

Input resistance

R

Ω

100
1) Reference potential is M0

Voltage supply

Operating voltage

nominal

U

V

24

Lower limit value

UB(t)min

V

22

Upper limit value

UB(t)max

V

35

Power consumption

max.

Smax

VA

35

Current consumption

max.

Imax

A

1.5

Fuse

2.5 A time-lag

Digital inputs

Enable

On (active)

U

V

10 ... UB

Off (inactive)

U

V

0 ... 9

Ramp on/off

On (active)

U

V

0 ... 9

Off (inactive)

U

V

10 ... UB

General

Component series

1X

Type of electronics

Analog

Design

Euro-card

For applications outside these parameters, please consult us!

Notice:

For information on environment simulation testing for the fields EMC (electro-magnetic compatibility), climate and mechanical load, see data sheet 30117-U

technical illustration-VT-VRPA1-100-1X/SO43A-466B-Flow-cont.valve ampl, cardversion 1X

Function

Jumper

Factory setting

Command value 3
(differential input)

X14

X12

X13

0 ... 10 V

technical illustration-VT-VRPA1-100-1X/SO43A-466B-Flow-cont.valve ampl, cardversion 1X technical illustration-VT-VRPA1-100-1X/SO43A-466B-Flow-cont.valve ampl, cardversion 1X technical illustration-VT-VRPA1-100-1X/SO43A-466B-Flow-cont.valve ampl, cardversion 1X

0 ... 20 mA

technical illustration-VT-VRPA1-100-1X/SO43A-466B-Flow-cont.valve ampl, cardversion 1X technical illustration-VT-VRPA1-100-1X/SO43A-466B-Flow-cont.valve ampl, cardversion 1X technical illustration-VT-VRPA1-100-1X/SO43A-466B-Flow-cont.valve ampl, cardversion 1X

4 ... 20 mA

technical illustration-VT-VRPA1-100-1X/SO43A-466B-Flow-cont.valve ampl, cardversion 1X technical illustration-VT-VRPA1-100-1X/SO43A-466B-Flow-cont.valve ampl, cardversion 1X technical illustration-VT-VRPA1-100-1X/SO43A-466B-Flow-cont.valve ampl, cardversion 1X

Jumper

Function

Jumper

Factory setting

Enable

X3

on

technical illustration-VT-VRPA1-100-1X/SO43A-466B-Flow-cont.valve ampl, cardversion 1X

Can be controlled externally

technical illustration-VT-VRPA1-100-1X/SO43A-466B-Flow-cont.valve ampl, cardversion 1X

Ramp

X4

off

technical illustration-VT-VRPA1-100-1X/SO43A-466B-Flow-cont.valve ampl, cardversion 1X

Can be controlled externally

technical illustration-VT-VRPA1-100-1X/SO43A-466B-Flow-cont.valve ampl, cardversion 1X

Ramp time

X9

X8

0.02 ... 5 s

technical illustration-VT-VRPA1-100-1X/SO43A-466B-Flow-cont.valve ampl, cardversion 1X technical illustration-VT-VRPA1-100-1X/SO43A-466B-Flow-cont.valve ampl, cardversion 1X

0.2 ... 50 s

technical illustration-VT-VRPA1-100-1X/SO43A-466B-Flow-cont.valve ampl, cardversion 1X technical illustration-VT-VRPA1-100-1X/SO43A-466B-Flow-cont.valve ampl, cardversion 1X

1)      For use of amplifiers VT 5003, VT 5004 and VT 5010, jumper X3 (enable) has to be set to "on".

Potentiometer

Zero point command value

Command value attenuator

Ramp time "Ramp up"

Ramp time "Ramp down"

Zero point actual value

Actual value attenuator

Measuring sockets

Ramp time "Ramp up"

Ramp time "Ramp down"

Actual value

Command value

Reference potential

LED displays

Ready for operation (green)

Enable (yellow)

technical illustration-VT-VRPA1-100-1X/SO43A-466B-Flow-cont.valve ampl, cardversion 1X

1

Differential amplifier

2

Summing device

3

Ramp generator

4

Threshold switch

5

Enable circuit

6

Power supply unit

7

Command value limiter

8

PID controller

9

Fault recognition

11

Summing device, controller

12

Over-current identification

13

Clocked output stage

14

Oscillator

15

Driver

16

Demodulator

17

Output stage

18

Proportional valve

19

Position transducer

Zw

Zero point command value

Gw

Command value attenuator

Zx

Zero point actual value

Gx

Actual value attenuator

Ready for operation (green)

Enable (yellow)

t1

Ramp time "Ramp up"

t2

Ramp time "Ramp down"

X3...X14

See Operating and display elements

Dimensions in mm

technical illustration-VT-VRPA1-100-1X/SO43A-466B-Flow-cont.valve ampl, cardversion 1X

Dimensions in mm

technical illustration-VT-VRPA1-100-1X/SO43A-466B-Flow-cont.valve ampl, cardversion 1X

The amplifier card must be configured according to its application. The amplifier card may only be unplugged and plugged when de-energized. No connectors with free-wheeling diodes or LED displays must be used for solenoid connection. Only carry out measurements at the card using instruments Ri > 100 kΩ. Measurement zero (M0) is increased by +9 V compared to 0 V operating voltage and not isolated, i.e. –9 V regulated voltage 0 V operating voltage. Thus, do not connect measurement zero (M0) to 0 V operating voltage. For switching command values, relays with gold-plated contacts have to be used (low voltages, low currents). Always shield command value lines; connect shielding to 0 V operating voltage on the card-side, other side open (risk of ground loops). Recommendation:
Also shield solenoid conductors.
For solenoid conductors up to a length of 50 m, use cable type LiYCY 1.5 mm2. For greater lengths, please contact us. The distance to aerial lines, radios, and radar systems has to be at least 1 m. Do not lay solenoid conductors and signal lines near power lines. Due to the charging power of the smoothing capacitor on the card, time-lag characteristics are required at the pre-fuses. Do not connect the port of the inductive position transducer marked with the ground sign with the ground. (Requirement for the compatibility with amplifier type VT 5003, VT 5004 and VT 5010) If the differential input is used, both inputs must always be connected or disconnected at the same time.