Upper And Lower Limit Frequency Signal Output [ Ul. L L ] - Toshiba TOSVERT VF-A3 Instruction Manual

@ @
@
RCH lOW
PZ4
(uL)
(lL)
Common Signal Signal
terminal
input input
terminal
terminal
Programmable controller
Figre 4.3 Example inverter-ta-programmable controller connections for reach signal detection
• When an output frequency fluctuates in the vicinity of a frequency to be reached, the reach
signal may alternately turn on and off because of the lack of hysteresis in the reach signal.
4.2.3 Upper and lower limit frequency signal outputs [
UL. L L ]
A reach signal is output when a pre-designated upper frequency or lower frequency is reached
during a run. (For details of upper and lower frequency setting, refer to Section 3.10 on.
page 56).
Figre 4.4 shows the timing chart and output signals of an example operation.
OUTPUT frequency
Ul
-------------------'r-------""'L
LL
~--~~------~--~--------------~------------~--~------Time
Across
ST-Ce
Across
F-eC
I
I
i
I
I
I I
Maximum frequency
r----....
!I - - - - - - - - - - - - ,
Operating frequency set v i a :
I
operating panel and control terminals I
Output signal across LL-P24
Output signal across UL-P24
I
I
I
J
I
I
I
I
I
Figure 4.4 Example operation with upper and lower limit frequency signal outputs
*
When the upper frequency (
UL )
or lower frequency (
L L )
is reached during a run ,the
reach Signal may alternately turn on and off.