Yaskawa G5 Eliminator - Manual (Page 13)

Date: 07/01/04, Rev: 04-07 Page 13 of 27 TM.G5SW.015
2.1.9 Motor Speed Reference
The Motor Speed function outputs the calculated motor speed as a percentage of the maximum
frequency setting. The value output can range from 0 to 10000.
2.1.A Read Memory
Read Memory functions output the value stored in memory by the corresponding Write Memory
function. This memory is volatile and stored values will be lost when the drive is turned off. This
may be used to retrieve old values from the previous scan when the read function precedes the
write function in the configuration. It can also be used to store a value from a function output
allowing the function to be ended and used again later in the configuration. This value can be
connected where required within the same scan.
2.2 Operations
Operation function blocks are used to change the data that is input. Some operations may be
needed more than on time in a configuration. This is only possible for the operations that
indicate it. When this is done all inputs of the operation must have the information required
present before the output is executed for each instance. This is important when several
operations are connected together.
2.2.1 Math
Math functions are used to convert numbers as indicated by the function blocks. These
functions may be used more than one time in a configuration. The following equations are used.
Addition: Input 30 + Input 31 = Output 32
Subtraction: Input 3a – Input 3b = Output 3c
It is important to know that the multiplication and division operations are not standard. The
scale function can be used for true multiplication and division.
Figure 2.1.9
Motor
Speed
17
Figure 2.2.1
41
Change
Sign
40
Absolute
Value
32 30
31
+ 3c 3a
3b
-
52 50
51
X
5c 5a
5b
/
Figure 2.1.A
Read
Memory 2
47
Read
Memory 1
46