Continuing Operation At Constant Speed When Frequency Reference Is Lost - YASKAWA Varispeed G7 Series Instruction 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 a master speed analog input
400 ms.
When the error signal during frequency reference loss is output externally, set H2-01 to H2-05 (multi-function
contact output terminal M1-M2, P1-PC, P2-PC, P3-C3, and P4-C4 function selection) to C (frequency refer-
ence lost).
* Frequency references using the following master speed analog inputs are used to detect a frequency loss.
• Analog input using terminal A1
• Analog input using terminal A2 when H3-09 (Multi-function analog input terminal A2 function selection) is set
to 0 (Add to terminal A1).
Related Constants
Con-
stant
Number
L4-05
-72
6
Name
Description
Display
Operation when 0: Stop (Operation follows the
frequency refer- frequency reference.)
ence is missing 1: Operation at 80% speed
continues. (At 80% of speed
before the frequency reference
was lost)
Ref Loss Sel
Frequency reference is lost: Fre-
quency reference dropped over
90% in 400 ms.
Control Methods
Change
Setting Factory during
V/f
Range Setting Opera-
V/f with
tion
PG
0 or 1 0 No A A
*
is reduced 90% or more in
MEMO
Open Open
BUS
Flux
Loop Loop
Regis-
Vec-
Vector Vector
ter
tor
1 2
A A A 49DH