VT-SR7-1X/0/EFF00270

Manufacturer: Bosch Rexroth

Material #: R978026931

Model : VT-SR7-1X/0/EFF00270

***Disclaimer: The following summary contains information gathered from various sources such as product descriptions, technical specifications and catalogs. While efforts have been made to provide accurate details, inaccuracies may occur. It is advised to verify all information by contacting Bosch Rexroth directly.***
The Bosch Rexroth VT-SR7-1X/0/EFF00270 (R978026931) is a sophisticated amplifier designed for precise control of variable displacement axial piston pumps, specifically for the AVS...HS series. This device features a push-pull output stage with bipolar transistors, ensuring reliable performance in demanding applications. An enable circuit relay, indicated by an illuminated LED on the front plate, allows users to connect or disconnect the output stage as needed. The unit's output stage integrates an I controller with an attached dither signal generator, where the dither amplitude is adjustable. For precise operation, a PD controller manages the prestage current command value while providing visual feedback through an instrument on the front plate. The amplifier also includes an oscillator-demodulator for accurate position sensing and is designed as a pluggable printed circuit board tailored to match the size of the axial piston unit it controls. Additionally, this model offers a zero-point adjustment accessible from the front plate and requires a symmetric operating voltage UB that is safeguarded against reverse polarity. An auxiliary stabilized voltage UM is necessary if no onboard voltage regulators are present, with protection against reverse polarity up to a specific current limit. The optional PID controller enhances functionality by allowing for additional control loops such as drive control, with customizable P and D shares adjustable from the front plate. This feature must be specified at the time of order and results in a unique type designation upon delivery. The VT-SR7-1X/0/EFF00270 operates within Component series X and conforms to Analog Eurocard format standards, making it suitable for integration into various industrial systems requiring precise flow adjustment capabilities.

$4,423.10 USD

More are expected on June 2, 2025

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Status: This product is temporarily out of stock.

Qty: Delivered as early as June 2, 2025 when ordered in

Voltage input Controller for the pump swivel angle Oscillator/demodulator for inductive position feedback Enable input Output stage with dither signal Measuring instrument for valve flow display

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.

01	Valve amplifier for flow control with servo valves	VT-SR7

02	Component series 10 ... 19 (10 ... 19: unchanged installation and connection dimensions)	1X

03	Without ±15 V voltage regulator	0
03	With ±15 V voltage regulator	1

04	For axial piston unit
	NG40	A4VS40HS
	Size 71	A4VS71HS
	NG125	A4VS125HS
	NG180	A4VS180HS
	NG250	A4VS250HS
	Size 35	A4VS355HS
	NG500	A4VS500HS
	NG750	A4VS750HS
	NG1000	A4VS1000HS

05	Further details in the plain text	*

01		02		03		04	05
VT-SR7	‒	1X	/		/		*

General

Component series		1X
Type of electronics		Analog
Design		Euro-card

Voltage supply

Operating voltage	with integrated voltage regulator			V	± 24
		Upper limit value		V	± 28
		Lower limit value		V	± 22
	without integrated voltage regulator			V	±24; ±15.0
		Upper limit value		V	±28; ±15.2
		Lower limit value		V	±22, ±14.8
Current consumption	max.		Imax	A	0.15

Analog inputs

Command value	Voltage 1)	grounded on one side, first input	Ucommand	V	0 … ±10
Command value	Voltage 2)	grounded on one side, second input	Ucommand	V	0 … ±10
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

Valve flow command value	UO		-10 V ≙ +60 mA (J10 plugged)

Solenoid outputs

Solenoid current	max.	Imax	mA	60
Dither signal				340 ±5 % (Ipp = 3 mA)

Other information

Relay	Pickup voltage	U		+24 (UB)
	Nominal voltage	U	V	26
	Response voltage	U	V	13
	Step-back voltage	U	V	1.3 ... 6.5
	Switching time	t	ms	4
	Coil resistance at 25 °C	R	Ω	700
Reference voltage	Potentiometer supply	U	V	±15 ±2 % (Imax = 150 mA)
Anschlussart				32-pole male multipoint connector, DIN 41612, design D
Ambient temperature range		ϑ	°C	0 … 50
Storage temperature range		ϑ	°C	-20 … 70
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.