Application examples COMPAX-M/SSpeed control mode23411.1.6 Speed control modeApplication:A centrifuge for manual operation should be operated by an operating mode switch. The centrifugal processshould either be run at a permanently set speed or the test tubes should be removed, one after another,through the removal aperture. The shutter on the removal aperture must only be able to open when thecentrifuge is at a standstill.Design and wiring up of the digital inputs and outputs:lightbarrieropeningshuttertest tube+24VlightbarrierI10I7COMPAXoperating mode:0 = remove1 = centrifugeI8I9O7shutter+24V+24VlockingFunction:The first event after COMPAX has been started is the setting of the accelerating and braking time 10s(N001). A check is then run to find out whether the shutter is closed (N002). If it is not closed, the interlock isopened (N003) and the system waits until the shutter is closed (N004). If the shutter is closed, the interlock isalso closed (N005). The interlock is checked for safety reasons (N006). The operating mode switch is thenqueried (N007).If this is set to "Removal", the speed is set to 0.1 % using N008. The system waits until the light barrier isactivated by a test tube (N010). When this occurs, the speed is set to 0 (N011) and the interlock is opened(N012). The shutter can now be opened to insert or remove a test tube. COMPAX monitors the opening andclosing of the shutter (N013 / N014) to lock this again after the closing (N015 / N016) and to return to theoperating mode query. If "Removal" is still set, the centrifuge is turned further to the next test tube. (N009ensures that once the speed has accelerated to 0.1% (N008), the system waits until the previous test tubeno longer activates the photoelectric barrier.)If the operating mode switch is set in the "Centrifuge" position, the centrifuge is accelerated to 100% within10s (N018). This speed is retained until the operating mode switch is set to "Removal" (N019 / N020). Then,the centrifuge is decelerated to 0.1% (N008) and stops at the next test tube. The test tubes can then beremoved one after another.
