LINK TechBox/TechCard Instruction Manual - HA470016 Issue 5
Speed values
A drive running at full line speed may need to exceed that speed to satisfy a controlled
variable.
100% of drive speed = 83.3333% in LINK
which is the same as
120% of drive speed = 100% in LINK
Example: A line speed signal from a LINK Master Ramp to a drive section. Range 0% to
83.3333%
When using speed values in
LINK
configurations, it is necessary to multiply the reference
signal to the drive by 83.3333%. Some special function blocks like the Master Ramp already
have this multiplier built in. Refer to specific function block help sheets for details.
Note: While it is necessary to multiply the speed reference by 83.3333%, it follows that the
speed feedback signal coming back from the drive needs to be divided by
83.3333%. Use the Value Reader 120 and Value Writer 120 blocks in your techbox
configuration.
Current values
A drive may occasionally need to exceed its rated continuous current and go into a short-term
overload condition.
200% of drive current = 100% in LINK
Example: A load indicating signal. Range -200% to +200%
When using current (torque/load) values in
LINK
configurations, it is necessary to multiply
the reference signal to the drive by 50%.
Note:While it is necessary to multiply the current (torque) reference by 50%, it follows that
the current (torque, load) feedback signal coming back from the drive needs to be
divided by 50%. Use the Value Reader 200 and Value Writer 200 blocks in your
techbox configuration.
Tag Readers and Writers
Ordinal Reader Function Block
From the
Block/Techbox
menu select Ordinal reader. Drag and place it towards the left edge of
your sheet.
Double-click on it and select settings, as shown below.
•
Select the tag number associated with the parameter to be read. This may be found under
“Specification Table – Tag Number Order” in the drive instruction manual.
•
Poll period should be set to a realistic value, fast enough to be read continuously, yet not so
fast, that it overloads the processor. Reads are typically recommended at 200 ms.
•
Click the output terminal and drag it to the next
LINK
block in the configuration.
Output terminal
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