Delta RMC101 User Manual download pdf (Page 222)

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101

RMC100 and RMCWin User Manual

4-36

Step 0:

This step is normally linked to after finishing a sequence. If the event control is at step 0, it

usually means the event control has stopped. This step does nothing.

Step 1:

Issues a P command so the axis will hold position. Waits for 1/2 sec so the drive output will

stabilize for the next step.

Step 2:

Issues a Set Null Drive to Integral Drive. This updates the null drive (drive needed to hold

position), which is critical for pressure control.

Step 3:

This step moves to 36.0 in. at 10 in./sec (assuming it is set up for a resolution of 0.001 in.,

then 36000 = 36 in. and 10000 = 10 in.) It then waits until bit 1 (the In Position bit) is on

before continuing to the next step.

Step 4:

This step sets up the pressure parameters that will be used in step 5. The Mode word is set

up to Calculate Ramp Time and Integrator Active Only at Pressure. Pressure Set A is 1000,

Pressure Set B is 500, and the Command Pressure is 5000. This step waits 0 msec and goes

to step 5. Note that the Ramp Time, set to 200, is not used since Calculate Ramp Time has

been selected.

Step 5:

This step moves toward 40 in. with the Monitor Pressure bit set in the Mode word. Once the

pressure reaches Pressure Set A (as set in step 4), it will begin controlling pressure. It will go

to a pressure of 5000 ( as set in step 4). This step waits until bit 0 (At Pressure) is on before

continuing to step 6.

Step 6:

This step changes the Command Pressure to 6000, with the same Pressure Set A and B as

in step 4 and a Ramp Time of 50. The pressure will ramp to 6000, and then the step waits

1000 msec before continuing to step 7.

Step 7:

This step changes the Command Pressure to 5000, with the same Pressure Set A and B and

Ramp Time values as in step 6. The pressure will ramp to 5000, and then the step waits for

1000 msec before continuing to step 5. Steps 5 and 6 will repeat until a Quit Events (Q)

command is issued. Ramping the pressure up and down in this manner is very useful when

tuning the pressure. It is important that the Ramp Time be fairly short, because parameters

suitable for slow changes (long Ramp Times) may make the system unstable for fast

changes.

Notes on using event control for position/pressure:

o To begin an Event Step sequence, enter the desired event number in the Command

Value field and issue a Start Events (E) command by typing "E" in the Command

field on the main screen.

o Before any commands may be issued to an axis, a Set Parameters (P) command

must be issued. This initializes the axis.

o Event control is only allowed on position axes. However, when a pressure

command is entered in an Event Step on a position axis that has an assigned

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