Do you need the high speed of a bang-bang valve with less wear on your components? Maybe a Comnica directional control valve from Tokyo Keiki will be the solution to your problems.
Tokyo Keiki has come out with a line of directional and flow control valves called “Comnica.” This line of valves is a smart bang-bang valve with many adjustable settings. There are three modes for the valve, analog, channel and shockless. This new design offers independent settings for acceleration and deceleration. These valves have an onboard microprocessor that allows setting of parameters. Programming can be done per valve with the touch buttons or across many valves with a handheld setting device, ideal for multiple valves or mounted valves. Comnica has a compact space saving design with the same configuration as a solenoid valve. Can be connected to general purpose relays, PLCs, and much more. Quantity discounts available and a lead time of 11-23 weeks. Can run with either petroleum based hydraulic oil or water/glycol based hydraulic oil.
Analog setting needs a separate power supply of -10 to 10 volts. The polarity can be reversed and controls the operation with absolute values specified for flow. The change time is set to reduce the shock when inputting an analog command voltage in a stepwise manner. Ramp up and ramp down time can be set into the valve separately in each direction to ensure a smoother transition.
Channel Setting (CH) can use various switches to control speed, can turn them on in chronological order and it will take the command of the last switch. Good for slowing down and ramping up speed. 3 channels for each side with ramp up/ramp down times built in to commands. Ramp time can be between 0 and 9.9 seconds. This setting is good for connecting to a PLC, general-purpose relays, proximity switches, etc. to manage shockless operation, flow control and position.
Shockless setting (SH) only has two settings per direction, no 3A and 3B. Switch to turn on (high speed), then switch off for second setting (low speed). 1st time setting controls the ramp up time, 2nd time setting reduces close speed of valve for soft close. Halt signal used to obtain position control. Low speeds with only wiring 1A and 1B, making this a good option for PLCs with less available outputs. Ramp time of 0 to 9.9 seconds.
In addition to the valve parameters previously mentioned, the COMNICA software includes an adjustable dither frequency, current gain, and current offset value under the “Extension Settings” Tab.
Dither frequency is important in applications where the static friction of the valve is high enough to cause irregular operation of the valve spool. There is also hysteresis in the valve shifting, meaning that for a given input signal you would get a difference response. The dither frequency ensures that the valve response is consistent by constantly breaking the static friction through small vibrations. Current Gain and Current % gives the user more control over the response of the valve. All of the parameters can be saved to and read from a .txt file.
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Contributors:
CMA/Flodyne/Hydradyne is an authorized Tokyo Keiki distributor in Illinois, Wisconsin, Iowa and Northern Indiana.
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