6-44
Continuing Operation at Constant Speed When Frequency
Reference Is Lost
The frequency reference loss detection function can be used to continue operation at reduced speed using the
set value in parameter L4-06 as frequency reference value. When using an analog input as frequency reference
source, a frequency reference loss is detected, when the reference value drops over 90 % in 400 ms or less.
When an error signal during frequency reference loss shall be output externally, set H2-01 or H2-02
(multi-function contact output terminal M1-M2 and M3-M4 function selection) to C (frequency reference
lost).
Related Constants
Con-
stant
Number
Name Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Access
Level
L4-05
Operation when frequency refer-
ence is missing
0: Stop
1: Operation (L4-06*fref@loss) inverter runs with
reduced speed.
Frequency reference loss means that the frequency refer-
ence drops over 90% in 400 ms.
0 or 1 1 No A
L4-06
Output frequency adjustment after
freq. reference loss
If L4-05 is set to 1 and the reference is lost, inverter will
run at:
fout = L4-06*fref@loss
0 to
100%
80% No A
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