Puu Number - Delta ASDA-A3 Series User Manual

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10.3.3 PUU number

The PUU number is a 32-bit absolute value with a positive or negative sign. When the motor is

running in the forward direction, the PUU number increases; when it is running in the reverse

direction, the PUU number decreases. The forward direction does not mean the motor is running

clockwise; the direction is defined by P1.001.Z. The maximum range of the cycle number is -32768

to +32767. AL062 occurs when the number of cycles overflows. If the PUU number exceeds the

range -2147483648 to 2147483647, the position counter overflows and AL289 occurs. Establish

the absolute origin coordinates to clear these alarms (AL062 or AL289). You can determine

whether or not to show AL062 and AL289 when the position overflows with P2.070. When reaching

the maximum PUU number in the forward direction, the value changes from 2147483647 to

-2147483648, -2147483647, until 2147483647. The value changes the other way when the motor

operates in the reverse direction. See the following examples:

When P1.044 = 16777216 and P1.045 = 100000, the motor needs 100,000 PUU to run a cycle.

2147483647 ÷ 100000 ≒ 21474.8, so once the motor runs over 21,474.8 (< 32767) cycles in the

forward direction, AL289 occurs.

When P1.044 = 16777216 and P1.045 = 10000, the motor needs 10,000 PUU to run a cycle.

2147483647 ÷ 10000 ≒ 214748.3, so once the motor runs over 32,767 (< 214748.3) cycles in

the forward direction, AL062 occurs.

Note: after establishing the absolute origin coordinates, any change to P1.001.Z or E-Gear ratio (P1.044

and P1.045) changes the original setting of the absolute origin coordinates. If the above parameters

are changed, re-establish the absolute origin coordinates.

Figure 10.3.3.1 Absolute position for PUU number

Overflow cycle value

-2147483648 to 2147483647

Absolute System

Ecm-a3 series