4WRLD 27 E600LJ-4X/MXT/24ND6T R901471403 Bosch Rexroth Directional valve

General information The pilot-operated IAC Multi Ethernet valve (Integrated Axis Controller based on directional control valves) is a digital directional control valve with integrated axis controller and the following functionalities:

• Position control

• Pressure/force control

• Closed-loop speed control

• Substitutional closed-loop control (position - pressure/force)

• Substitutional control (flow - pressure/force)

• pQ function (flow-controlled)

Among others, the following operating modes are possible:

• Valve direct control

• Drive-controlled position control

• Drive-controlled positioning

• Positioning block operation

• The command values are preset via the Ethernet interface (X7E1 or X7E2) or, alternatively, via the analog/digital interface (XH2)

• The feedback information of the actual value signals to the superior control system is provided optionally either via the Ethernet interface (X7E1 or X7E2) or the analog/digital interface (XH2)

• The controller parameters are set via the Ethernet interface (X7E1 or X7E2)

Set-up The directional control valve with IAC Multi Ethernet electronics mainly consists of:

• Pilot control valve (1) with control spool and sleeve in servo quality

• Main stage (2) with centering springs and position feedback

• Integrated digital axis controller (3) with:

• analog/digital interface (XH2)

• Ethernet interfaces (X7E1, X7E2)

• analog sensor interfaces (X2M1, X2M2)

• digital sensor interface (X8M)

• Interface for the position transducer of the main stage (X8A)

Function (symbol V, V1- and Q3) When the control solenoid of the pilot control valve is de-energized, its spring-operated control spool is in the “fail safe” position. The control spool of the main valve is in the spring-centered offset position at approx. 6 % of the stroke in direction P→B/A→T. The integrated electronics (OBE) compare the specified command value to the position actual value of the control spool of the main stage. In case of a control deviation, the control solenoid of the pilot control valve is activated and its control spool is adjusted. The flow which is activated via the control cross-sections at the pilot control valve leads to an adjustment of the control spool of the main valve. The stroke/control cross-section of the main valve is regulated proportionally to the command value. In case of a command value presetting of 0 %, the electronics adjust the control spool of the main valve to central position. The pilot oil supply in the pilot control valve is either internal via port P or external via port X. The feedback can be internal via port T or external via port Y to the tank. Switching off the release (symbol V and V1-) If the supply voltage fails or in case of cable break, the integrated electronics will de-energize the control solenoid, the pilot control spool will move to the fail-safe position and will unload the pilot oil chambers of the main valve. Operated by the spring, the main valve control spool will move to the offset position (approx. 6 % P→B/A→T). Function (symbol E. and W.) When the control solenoid of the pilot control valve is de-energized, its spring-operated control spool is in the “fail safe” position. The control spool of the main valve is in spring-centered central position. The integrated electronics (OBE) compare the specified command value to the position actual value of the control spool of the main stage. In case of a control deviation, the control solenoid of the pilot control valve is activated and its control spool is adjusted. The flow which is activated via the control cross-sections at the pilot control valve leads to an adjustment of the control spool of the main valve. The stroke/control cross-section of the main valve is regulated proportionally to the command value. The pilot oil supply in the pilot control valve is either internal via port P or external via port X. The feedback can be internal via port T or external via port Y to the tank. Switching off the release (symbol E. and W.) If the supply voltage fails or in case of cable break, the integrated electronics will de-energize the control solenoid, the pilot control spool will move to the fail-safe position and will unload the pilot oil chambers of the main valve. Operated by the spring, the main valve control spool will move to the central position. Monitoring The digital control electronics enable comprehensive monitoring functions/error detection including:

• Undervoltage

• Communication error

• Cable break for analog sensor inputs and digital position measurement system

• Short-circuit monitoring for analog/digital outputs

• Monitoring of the microcontroller (watchdog)

• Temperature of the integrated electronics

IndraWorks DS PC program To implement the project planning task and to parameterize the IAC Multi Ethernet valves, the user may use the IndraWorks DS engineering tool:

• Project planning

• Parameterization

• Commissioning

• Diagnosis

• Comfortable management of all data on a PC

• PC operating systems: Windows XP (SP3), Windows 7-10

Notes:

• Symbol V and V1-: Pilot-operated 4/3 directional control valves are only functional in the active control loop and do not have a locking basic position when deactivated. Consequently "external isolator valves" are required in many applications and must be taken into account regarding the switch-on/switch-off order. While the electrical supply voltage is being switched off, the drive may be accelerated for a short time in functional direction P→B.

• Symbol E. and W.: Pilot-operated 4/3-directional control valves with positive overlap are functional in controlled or regulated axes. The overlap in the de-energized state is approx. 20 % of the control spool stroke. While the release is being switched off, the drive may be accelerated for a short time in functional direction P→B. (For further details, please refer to operating instructions 29391-B)

Pilot oil supply (schematic illustration) Size 10 Size 16 Size 25 Size 27 Size 35

1	Plug screw M6 according to DIN 906, wrench size 3 - Pilot oil return
2	Plug screw M6 according to DIN 906, wrench size 3 - Pilot oil supply
3	Plug screw M12x1.5 according to DIN 906, SW6 - Pilot oil supply
4	Plug screw 1/16-27 NPTF, wrench size 4 - Pilot oil return
5	Plug screw 1/16-27 NPTF, wrench size 4 - Pilot oil supply
6	Housing cover main stage (position transducer side)

Pilot oil supply
External Internal	2, 3, 5 closed 2, 3, 5 open
Pilot oil return
External Internal	1, 4 closed 1, 4 open

Version “XY" External pilot oil supply, external pilot oil return In this version, the pilot oil is supplied from a separate control circuit (external). The pilot oil return is not directed into channel T of the main valve, but is separately directed to the tank via port Y (external). Version “PY” Internal pilot oil supply, external pilot oil return With this version, the pilot oil is supplied from channel P of the main valve (internally). The pilot oil return is not directed into channel T of the main valve, but is separately directed to the tank via port Y (external). In the subplate, port X is to be closed. Version “PT” Internal pilot oil supply; internal pilot oil return With this version, the pilot oil is supplied from channel P of the main valve (internally). The pilot oil is directly returned to channel T of the main valve (internally). In the subplate, ports X and Y are to be closed. Version “XT” External pilot oil supply, internal pilot oil return In this version, the pilot oil is supplied from a separate control circuit (external). The pilot oil is directly returned to channel T of the main valve (internally). In the subplate, port Y is to be closed.