User`s manual

6-57
6
 Continuing Operation at Constant Speed when the Frequency Reference
is Lost
The frequency reference loss detection function detects a loss of the frequency reference value. If an analog
frequency reference source is selected, a frequency reference loss is detected, when the reference value drops
over 90% in 400 ms or less.
The operation after a reference loss can be set in parameter L5-01 as follows:
• L5-01=0 The inverter operation is stopped.
• L5-01=1The operation is continued at reduced speed using the set value in parameter L4-06 as frequency
reference value.
When an error signal during frequency reference loss shall be output externally, set H2-01 to H2-03 (multi-
function contact output terminal M1-M2, M3-M4, and M5-M6 function selection) to C (frequency reference
lost).
Related Parameters
Multi-function Contact Outputs (H2-01 to H2-03)
Parameter
No.
Name
Factory
Setting
Change
during
Opera-
tion
Control Methods
V/f
V/f with
PG
Open
Loop
Vector
Closed
Loop
Vector
L4-05Operation when frequency reference is missing 0 No AAAA
L4-06Output frequency adjustment after freq. reference loss 80% No AAAA
Set Value Function
Control Methods
V/f
V/f
with
PG
Open
Loop
Vector
Closed
Loop
Vector
C Frequency reference loss Yes Yes Yes Yes