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It is possible to decrease the output frequency as the REF signal
increases as follows:
Output frequency
o
20 ----------100-1.
REF
Adjustment of bias/gain by using the monitor may be varied by variations
of input resistance.
For precise adjustment of bias/gain, input the actual frequency command
value (4mADC, 20mADC, etc.), and set the rheostats 1 RH and 2RH while
referring to the frequency command value "F" by using the monitor
function.
(Example)
Output frequency
10H..
--r------ ---
••
'0
o
1
1
I
10H
2RH
0--20 _ _ _ _ _ _ _ _
100"4
ItEI'
DC
4 - - - - - - - - 20 .....
(2)
3RH, 4RH: Upper/lower limits of output frequency
IRH
:&
2RH=
,- t.I
CI
I·,
,*' '(,.'. '.'
,- I:' ,.,
,.,
~-
c:' t..'. ,_,
3RH and 4RH is used to set the upper and the lower limits of output
fre~
quency in the inverter without regard to the REF input signal. These would
ensure the overspeed prevention of a fan and the minimum delivery
pressure of a pump.
1)
Upper limit (UL) adjustment
Adjust the upper limit of output frequency by
using 3RH while checking the digital indicator.
9"5
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