YASKAWA G7 Technical Manual page 23

For the ELS - Sign Run mode (P1-01 = 5), the functionality of the Communication Advance/Retard Counts
Register is adjusted in the same way. With a forward run command, a positive value in the register will
move the follower drive in the absolute positive direction and a negative value will move the follower drive in
the absolute negative direction, while with a reverse run command these directions are switched. The
direction the follower is moved by the Advance/Retard command is always with respect to the run command
direction. The functionality of Advance/Retard for both P1-01 = 4 (Standard ELS) and P1-01 = 5 (ELS - Sign
Run) is shown in Figure 4.
When the drive is put into local mode (digital input or keypad button) or when the drive is given a forward or
reverse jog command, the frequency reference is switched back to standard frequency reference and the
selected Accel / Decel times are used.
The table below shows the direction of the Follower depending on the direction of the Master, P1-01 setting,
B1-04 (reverse operation prohibit selection) setting, and the forward run / reverse run digital input signal.
Follower Rotation Direction for Various Settings and Master Direction
B1-04 Digital
(Reverse Input
Master:
Operation) Signal
FWD
FWD FWD
B1-04 = 0
Enabled
REV REV
FWD FWD
B1-04 = 1
Disabled
REV NONE
a: Inability to follow causes position error accumulation and potential FDEV faults in these conditions.
b: Inability to follow does not cause position error accumulation in these conditions unless P1-09 = 1, due to
the way the drive handles the B1-04 = 1 condition.
Figure 4 below outlines the follower direction and Advance/Retard behavior for P1-04 settings and forward /
reverse run command selections.
Figure 4: Follower Direction and Advance/Retard Behavior
Date: 03/31/09, Rev: 09-03
P1-01 = 1 P1-01 = 2
Master: Master:
REV FWD
REV FWD
FWD NONE
NONE FWD
NONE NONE
FWD Run Command
Master
FWD
P1-01 = 4
REV
FWD
P1-01 = 5
REV
P1-01 = 3
Master: Master: Master:
REV FWD REV
NONE FWD FWD
REV REV REV
NONE FWD FWD
NONE NONE NONE
REV Run Command
Follower Master
FWD FWD
Ret
Adv
REV REV
Ret
Adv
FWD FWD
Ret
Adv
REV REV
Ret
Adv
Page 23 of 30
P1-01 = 4
Master: Master: Master:
FWD REV FWD
FWD REV FWD
FWD REV REV
b
FWD FWD
NONE
a b
NONE NONE NONE
Follower
FWD
Ret
Adv
REV
Ret
Adv
REV
Ret
Adv
FWD
Ret
Adv
P1-01 = 5
Master:
REV
REV
FWD
b
NONE
a b
NONE
TM.G7SW.064