News for APV10 Mobile Valve Series
The AMCA mobile valve series is used for proportional, load-compensated control of hydraulic consumers. The mobile valves of this series can work with both LS pumps and fixed displacement pumps and are available in sizes APV10 (0-80 l/min), APV16, APV 22 and APV32 (0-1000 l/min).
New is the CAN bus controller AP-1020-356J and AP-1020-356K for proportional control of valve sections of size APV10..
Function of the CANBus controller in the valve section
Up to now, the APV sections, or more precisely the main spool in the respective section, can be controlled manually, hydraulically or electrically. In addition, CAN bus control is now also available, which receives its setpoints and commands via bus communication from a higher-level control system and, conversely, can return status information. Directly integrated in this module are the pilot valves for proportional control of the main spool. An LVDT displacement signal transmitter for monitoring or control completes the bus controller.
The CAN bus controller for controlling the APV10 valve sections is available as either a 12 VDC version (AP-1020-356J) or a 24 VDC version (AP-1020-356 K). The controller is flanged to the standard spool section with an adapter, the LVDT displacement sensor is connected to the main spool. The two pilot valves control the main spool on both sides, ensuring its proportional displacement.
Function of the CANBus Controller
The individual sections are combined to form the overall assembly. Different control types can also be combined in the configuration.
Overall Valve Assembly
Advantages of CANBus Technology
Control via CANbus provides particular advantages if a larger number of consumers is to be controlled, which corresponds to higher number of valve sections. With purely electrical control, each control solenoid requires individual wiring up to the machine control and an analog output per channel in the higher-level PLC (Programmable Logic Control).
Wiring effort for conventional electrical control
When using CANbus controllers, no additional outputs are required in the controller. Additional modules are only integrated into the CAN bus line with stub lines. The lines can thus be significantly shorter.
Another advantage of CANbus technology is the possibilities for monitoring the valve actuation. The integrated LVDT displacement sensor can reliably determine the position of the spool. Malfunctions, e.g. due to blocked spools or defective control coils, can thus be detected.
Advantages of CANbus Wiring
The aspect of functional safety can also be covered with the CANbus controller. The integrated LVDT displacement sensor increases the diagnostic coverage level. The optional additional circulation or relief valve can be used to implement a secondary shutdown path that switches the system to a safe state when a critical state is detected.