Delta Electronics VFD-M - Manual (Page 92)

Chapter 4 Parameters|
Revision May 2008, ME14, SW V3.04 4-57
Application Note:
PLC program execution will be interrupted when values for JOG parameters 15 and 16 are changed.
Pr.79 PLC Forward/Reverse Motion
Settings 00 to 127 Factory Setting: 00
This parameter determines the direction of motion for the multi-speed Pr.17 to Pr.23 and
Master Frequency. The original direction of Master Frequency will become invalid.
Note: A 7-bit binary number is used to program the forward/reverse motion for each of the 8 speed
steps (including Master Frequency). The binary notation for the 7-bit number must be
translated into decimal notation and then entered in Pr.79.
1 2 3 4 5 6 7
Weights
Bit
0=Forward
1=Reverse
Direction of 1st Pr.17 speed for
Direction of 2nd Pr.18 speed for
Direction of 3rd Pr.19 speed for
Direction of 4th Pr.20 speed for
Direction of 5 Pr.21 th speed for
Direction of 6 Pr.22 th speed for
Direction of 7 Pr.23 th speed for
Example:
1 2 3 4 5 6 7
Weights
Bit
0=Forward
1=Reverse
Forward motion of Pr.17 multi-speed1
Reverse motion of Pr.18 multi-speed2
Forward motion of Pr.19 multi-speed3
Forward motion of Pr.20 multi-speed4
Forward motion of Pr.21 multi-speed5
Reverse motion of Pr.22 multi-speed6
Forward motion of Pr.23 multi-speed7
0 1 0 0 0 1 0
Direction
The setting value=bit7 x 2 6 +bit6 x 2 5 +bit5 x 2 4 +bit4 x 2 3 +bit3 x 2 2 +bit2 x 2 1 +bit1 x 2 0
= 0 x 2 6 +1 x 2 5 +0 x 2 4 +0 x 2 3 +0 x 2 2 +1 x 2 1 +0 x 2 0
= 0+32+0+0+0+2+0+0
= 34