Rockwell-automation 1746-QV,D17466.18 OPEN-LOOP VELOCITY CONTL Manual do Utilizador descarregar pdf (Página 15)

3–5

Setting Up the Software

Publication

1746-6.18 April 1998

Consider the following when you set up your profiles:

• Extend and retract define the profile with respect to the LDT head:

extend is always away from the head, retract is always towards it

• Position data changes direction depending on how you set

configuration bit Ge:0/15 for LDT motion:

0 = position data increases when moving away from LDT head

1 = position data increases when moving towards LDT head

• Each position setpoint triggers from the absolute position data

(I:e.1) as modified by the preset reference.

• Position setpoints are in units of 0.01”.

For example, enter 2” as 200.

• If you enter position setpoints in random order, the module places

them in ascending order (P1 = lowest and P7 = highest) with their

associated voltage value.

• Speed segments are defined increasing from the LDT head,

regardless of position data direction.

• Speeds are reported in the input image table words 2-7 (I:e.2-I:e.7)

for the previous profile (extend speeds reported during the next

retract profile and vice versa)

• Voltage values (for speed) are in the range of "10,000mV in

multiples of 5mV. For example, enter –5.005V as –5005.

Important: Enter voltage values in multiples of 5mV or the module

will fault, causing you to correct and re-download the profile.

• Voltage values are cleared when you re-program position

setpoints. The profile is cleared when the module loses power or

when you change the value of any G-file configuration word.

Important: Your application may require different position setpoints

and voltage values. Your profiles must be consistent with the physical

parameters of the LDT and G file to guard against damaging hardware.

In general:

• For relatively faster and smoother motion, use two speed segments

for acceleration and five speed segments for deceleration.

• Adjust the ramp rate on the proportional amplifier for the smoothest

operation. Initially, start with the ramp disabled (fastest ramp rate).

• You may compensate for deadband or valve overlap by specifying a

voltage value greater than or equal to the valve’s bias current.

Profile operation depends on how the module reports position data.

With the data-direction bit (Ge:0/15), you select whether:

– position data increasing towards the LDT head (Ge:0/15 = 1)

– position data increasing away from the LDT head (Ge:0/15 = 0)

General Conventions

for Profiles

Profile Operation

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 34 35

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