Mitsubishi Electric Freqrol-A100 Instruction Manual page 133

4.3 ADJUSTMENT OF THE FREQUENCY SETTING SIGNALS
"BIAS" AND "GAIN"
The bias and gain functions are used to adjust the relationship
between the input signal entered from outside the inverter to
2.
set the output frequency, e.g. 0 to 5VDC, 0 to 10VDC or 4 to
5
u Factory settmg 20mADC, and the output frequency.
z
" . .
The following parameters are used for this adjustment:
5 (60Hz)
-
- -
-
- -
Pr. 902 "frequency setting
Pr. 904 "frequency setting
--4
Gam Pr.903
voltage bias" current bias" :--
I
Pr 905
B ~ a s
Pr. 903 "frequency setting
Pr. 905 "frequency setting
: ; : : :
,
voltage gain" current gain"
0
Frequency settmg
5V Pr.73
Any of three procedures may be used for the adjustment:
'
o
s ~ g n a i I
ov
4
adjustment is made without a voltage applied across terminals
20rnA
2 and 5 (adjustment procedure 1); any point is adjusted with a
voltage applied (adjustment procedure 2); or any point is ad-
justed without a voltage applied (adjustment procedure
3).
Adjustment example
Pr. 902 "frequency setting
........
Set the output frequency to
voltage bias" 10Hz at the set voltage of OV.
Pr. 903 "frequency setting
........
Set the output frequency to
o
v
'
voltage gain" 50Hz at the set voltage of 5V.
Before making adjustment, make sure that the set value of Pr. 73 "0 to 5V, 0 to 10V selection" is "1"
(factory setting: 0 to 5V).
Adjustment procedure 1 (without a voltage applied across terminals 2 and 5)
(1) Setting of the frequency setting voltage bias
1) Press the [PU OP] key.
...
The frequency setting screen is
I
displayed.
2 ) Press the [SET] key.
.......
The inverter is put in the
paraneter setting mode.
3) Using the numeral :..........The data on the right is
keys, enter 902. displayed.
4) Press the [READ] key.
....
The current set value of Pr. 902
is displayed.
Display
5) Using the numeral
..........
The data on the r ~ g h t is
......
The voltage need not be appl~ed
keys, enter 10. displayed. across terminals 2 and 5 .
6) Press the [WRITE]
..........
The set value is stored into
......
The bias setting is 10Hz.
memory and bias setting is
f
10H
(To the next page)
o
V
If the voltage is being applied across terminals
2-5
at this time, the bias setting as shown above.