YASKAWA Varispeed L7, Instruction Manual, Page: 192 / 243

PG Interface
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63
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„ Setting PG Pulse Monitor Output Dividing Ratio (F1-06)
This function is enabled only when using PG speed control card PG-B2. Set the dividing 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:
The dividing ratio can be set within the following range: 1/32
≤
F1-06
≤
1. For example, if the dividing 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.
„ Detecting Speed Difference between the Motor and Speed Reference (F1-04, F1-10
and F1-11)
Speed deviation is detected when the speed deviation (i.e., the difference between the speed reference and the
actual motor speed) is too large. Speed deviation (DEV) is detected only after a speed agreement (speed refer-
ence and actual motor speed are within the setting range of L4-02) and if a speed deviation higher than the set
value in F1-10 continues for longer than the time set in F1-11. After a speed deviation is detected, the Inverter
stops according to the setting in F1-04.
Dividing ratio = (1 + n)/m (Setting range) n: 0 or 1, m: 1 to 32
F1-06 =
†
n
††
m
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