Continuing Operation At Constant Speed When Frequency Reference Is Lost - YASKAWA G7 Series Technical Manual

Continuing Operation at Constant Speed When Frequency Reference Is
Lost
The frequency reference loss detection function continues operation using 80% speed of the frequency refer-
ence before loss when the frequency reference using an analog input is reduced 90% or more in 400ms.
When the error signal during frequency reference loss is output externally, set H2-01 to H2-05 (multi-function
contact output terminal M1-M2, M3-M4, M5-M6, P3-C3, and P4-C4 function selection) to C (frequency ref-
erence lost).
Related Parameters
Name
Parameter
Number
Display
Frequency Determines how the Drive will react
Reference when the frequency reference is
Loss lost. The frequency reference is
Detection considered lost when reference
Selection drops 90% or more of its current
value for 400ms.
L4-05
0: Stop - Drive will stop.
1: Run at L4-06 PrevRef - Drive
will run at the percentage set in
Ref Loss Sel
L4-06 of the frequency reference
level at the time frequency
reference was lost.
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Setting
Description
Range
0 to 1
Continuing Operation
Control Methods
Change
Open
Factory
V/f
during
Loop
Setting
V/f with
Operation
Vector
PG
0 No A A
Open
Flux Loop
Vector Vector
1 2
A A A
65
6-