6-44
îš‹ 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 more than 90% in 400 msec or
less.
When parameter L4-05 is set to 1 the Inverter will continue operation at the percentage in L4-06 of the last
active frequency reference.
An fault signal during frequency reference loss can be output if H2-01 or H2-02 (Terminal M1-M2/M3-M4
function selection) to C (Loss of frequency reference).
îš„Related Parameters
Multi-function Digital Outputs (H2-01 to H2-02)
Parameter
Number
Name
Setting
Range
Factory
Setting
Change
during
Operation
Access
Level
L4-05 Operation when frequency reference is missing 0 or 1 1 No A
L4-06
Frequency reference value at frequency reference
loss
0 to 100% 80% No A
Set Value Function
C Loss of frequency reference
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