Yaskawa Matrix Converter - Manual (Page 302)

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„ Matching PG Rotation Direction and Motor Rotation Direction
Parameter F1-05 matches the rotation direction of both the PG encoder and the motor. If the motor is rotating
forwards, then indicate whether it is A-phase driven or B-phase driven by setting F1-05 accordingly. F1-05
must be set when using the PG-B2 or PG-X2 option cards.
Fig 6.80 PG Rotation Direction Setting
Generally, a PG encoder is A-phase driven when rotation is clockwise (CW) from the input axis. In the same
way, motor rotation is counter-clockwise (CCW) from the output side when Forward Commands are output.
Consequently, when motor rotation is forward, PG is normally A-phase driven when a load is applied, and B-
phase driven when a load is not applied.
„ Setting PG Pulse Monitor Output Ratio
This function is enabled only when using PG speed control card PG-B2, and sets the ratio for the PG pulse
monitor output. The set value is expressed as n for the upper digit, and m for the lower 2 digits. The ratio of
pulses for monitor output is calculated as follows:
The ratio can be set within the following range: 1/32 ≤ F1-06 ≤ 1. For example, if the ratio is 1/2 (set value 2),
half of the number of pulses from the PG are monitor output.
„ Detecting PG Disconnect
Select the stopping method when the PG cable disconnect is detected and the PG open circuit (PGO) detection
time.
When the MxC is operating with the frequency reference set to 1% minimum (except when operating on direct
current), PGO is detected if the speed feedback from PG is greater than the time setting in F1-14.
MxC
Forward
Command
Motor PG (encoder)
Pulse output
A-phase driven when set value = 0 B-phase driven when set value = 1
A-phase A-phase
B-phase B-phase
Example: Forward rotation of standard Yaskawa motor (PG used: Samtack (KK))
Forward
Command
Motor output axis rotates
counter-clockwise during
MxC Forward Command.
Rotation
(CCW)
A-phase
B-phase
Yaskawa standard PG used is A-phase driven (CCW) when motor rotation is forward.
Dividing ratio = (1 + n)/m (Setting range) n: 0 or 1, m: 1 to 32
F1-06 =
†
n
††
m