Parker Products COMPAX-M /-S (L) manual Speed control mode

Application examples	COMPAX-M/S
Speed control mode
11.1.6 Speed control mode

Application:

A centrifuge for manual operation should be operated by an operating mode switch. The centrifugal process should 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 the centrifuge is at a standstill.

Design and wiring up of the digital inputs and outputs:

		operating mode:		COMPAX			locking
		0	= remove
						+24V
		1	= centrifuge
shutter	light	+24V		I10	I9
	barrier
opening					O7

			+24V	shutter
test tube	light	I7	I8
	barrier

Function:

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 is opened (N003) and the system waits until the shutter is closed (N004). If the shutter is closed, the interlock is also closed (N005). The interlock is checked for safety reasons (N006). The operating mode switch is then queried (N007).

If this is set to "Removal", the speed is set to 0.1 % using N008. The system waits until the light barrier is activated 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 and closing of the shutter (N013 / N014) to lock this again after the closing (N015 / N016) and to return to the operating mode query. If "Removal" is still set, the centrifuge is turned further to the next test tube. (N009 ensures that once the speed has accelerated to 0.1% (N008), the system waits until the previous test tube no longer activates the photoelectric barrier.)

If the operating mode switch is set in the "Centrifuge" position, the centrifuge is accelerated to 100% within 10s (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 be removed one after another.

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