Description of Functions
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EN
· 30.30.01.02851 · 01 · 03/22
7.4
Control Functions [P-0: 0x0044]
The area gripper FXP-i enables you to conserve compressed air or prevent an excessive vacuum from being generated.
Vacuum generation is interrupted once the configured switching point SP1 is reached. If leakage causes the vacuum to
fall below the reset point rP1, vacuum generation resumes.
The permitted leakage can be set in mbar/s using the
parameter in the Extended Functions menu. The leakage
is measured from the point when the control function interrupts suction after reaching switching point SP1.
This function is deactivated in the default setting. This function is not available on grippers of type FMP-i.
The following operating modes can be set for the controller function in the EF menu using the [
] parameter or via
IO-Link:
7.4.1
No Control (Continuous Suction)
The area gripper produces continuous suction with maximum power. This setting is recommended for very porous
workpieces, which would otherwise cause the vacuum generation to switch on and off continuously due to the high
rate of leakage.
In this mode, the control function is set to [
] = [
].
This setting is only possible when the control shutoff is deactivated [
] = [
].
7.4.2
Control
The area gripper switches off vacuum generation when the switching point SP1 is reached and switches it back on
when the vacuum falls below the reset point rP1. The switching point evaluation for SP1 follows the control function.
This setting is particularly recommended for airtight workpieces.
In this mode, the control function is set to
.
To protect the area gripper, valve switching frequency monitoring is activated in this operating mode.
If the readjustment is too fast, the control function is deactivated and the device switches to continuous suction.
7.4.3
Control with Leak Monitoring
This operating mode is the same as the previous mode, with the addition that the leakage rate within the system is
measured and
to the configurable limit value for permissible leakage
.
If the actual leakage rate exceeds the limit value more than twice in succession, the control function is then
deactivated and the ejector switches to continuous suction.
In this mode, the control function is set to [
].
7.4.4
Control Shutoff [P-0: 0x004E]
This function deactivates the automatic control shutoff.
The function can be set using the parameter [
] in the EF menu or via IO-Link:
Parameter
Setting value
Explanation
If excessive leakage is detected and the valve is switching too often (> 6 times in
3 seconds), the area gripper switches to “continuous suction” mode
Continuous suction is deactivated and the area gripper continues controlling in
spite of the high leakage or having a switching frequency of > 6 times in 3
seconds. Continuous suction will not be activated if the valve frequency is
exceeded.
When the control shutoff is deactivated, the suction valve makes frequent adjustments. This can destroy
the ejector.
