PROGRAMMING
SINUS K
MANUAL
12/
226
1.1.4.6.
VAR%
–
R
EFERENCE
V
ARIATION
P
ERCENT
(IFD
SW
ONLY
)
Terminals 9, 10, 11
C23=C24=C25=VAR%
This function allows to send a command generating a variation percent of the active frequency reference, which is
programmable from –100% to +100% through parameters P75÷P81.
The table below shows the frequency reference variation based on the condition of inputs MDI1, MDI2, MDI3 set as a
reference variation percent.
MDI1
0
1 0 1 0 1 0 1
MDI2
0
0 1 1 0 0 1 1
MDI3
0
0 0 0 1 0 1 1
Frequency reference variation 0
P75
VAR%1
P76
VAR%2
P77
VAR%3
P78
VAR%4
P79
VAR%5
P80
VAR%6
P81
VAR%7
NOTE
0
⇒
inactive input.
1
⇒
active input.
If only one of the three inputs is set as a variation %, the terminals which are not used are to be considered as inactive
(0).
For example, if only MDI3 is set as a variation percent, 0 is obtained with MDI3 inactive (input state = 0); P78 is
obtained with MDI3 active (input state = 1).
The output frequency will never exceed the max. preset frequency (see parameters C07 and C13, fomax1 and fomax2)
even if a higher frequency is required.
1.1.4.7.
V/F2
–
S
ECOND
V
OLTAGE
/F
REQUENCY
P
ATTERN
(IFD
SW
ONLY
)
Terminal 13
C27 = V/F2
One inverter can be used to control two motors having different ratings. To do so, two different parameter sets are to
be programmed. Each parameter set is selected with a digital command sent to terminal 13. Each motor will be then
controlled with the most suitable V/F pattern based on its ratings. The commutation of the motor operation must be
performed downstream from the inverter through disconnecting switches or contactors; in that case, perform
commutation only when the inverter is disabled (no ENABLE command is sent). If the inverter is enabled (ENABLE
contact close) or the START command is active, the commutation command will not be acknowledged.
If terminal 13 is inactive or is not set to V/F2, the first voltage/frequency pattern is produced (parameters C06÷C11
and C18÷C20).
If terminal 13 is active and set to V/F2, the second voltage/frequency pattern is produced (parameters C12÷C17).
CAUTION
Do not disconnect the motor from the inverter if the inverter is running.