Contents

Inverter
Forward
command
Motor
PG (encoder)
Pulse output
A-phase leads when set value = 0 B-phase leads when set value = 1
A-phase
B-phase
A-phase
B-phase
Example: Forward rotation of standard motor (PG)
Forward
command
Motor output axis rotates
counter-clockwise during Inverter
forward command.
Rotation
(CCW)
A-phase
B-phase
With the used PG the A-phase leads (CCW) when motor rotation is forward.
Generally, the A-phase leads when the rotation direction is counter-clockwise (CCW) seen from the shaft side
(FWD command is input).
•Setting PG Pulse Monitor Output Division Ratio (F1-06)
This function is enabled only when using PG speed control card PG-B2. Set the division ratio for the PG pulse
monitor output. The set value is expressed as n for the higher place digit, and m for the two lower place digits.
The dividing ratio is calculated as follows:
Dividing ratio = (1 + n)/m (Setting range) n: 0 or 1, m: 1 to 32
F1-06 =
n
m
The division ratio can be set within the following range: 1/32 ≤ F1-06 ≤ 1. For example, if the division ratio is
1/2 (set value 2), half of the number of pulses from the PG are output at the pulse monitor.
•Detecting PG Open Circuit (F1-02 and F1-14)
Parameter F1-02 selects the stopping method when a PG disconnection is detected.
PG open (PGO) is only detected when the inverter is running at least with a frequency reference higher than
1% of the maximum output frequency or above the minimum frequency (E1-09) and the PG feedback signal is
missing for the time set in F1-14 or longer.
•Detecting Motor Overspeed (F1-03, F1-08 and F1-09)
An overspeed (OS) is detected when the motor speed continues to exceed the set frequency value in F1-08 for
a time longer than set in F1-09. After detecting an overspeed (OS), the Inverter stops according to the setting
in F1-03.
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