37
4
4.6 Frequency and speed settings
• For the output/set frequency monitor, frequency setting, and parameter setting through the FR-A8ND, the unit of 0.01 Hz is
always applied regardless of the
Pr.37 Speed display
setting. The setting unit for the running speed (actual speed) monitor
depends on the
Pr.37
and
Pr.144 Speed setting switchover
settings as shown in the following table. (The initial values are
shown within the thick lines.)
Running speed r/min conversion formula: ................... frequency
120 / number of motor poles
(Pr.144)
Machine speed conversion formula: ............................
Pr.37
frequency /
Pr.505 Speed setting reference
For
Pr.144
in the above formula, the value is "
Pr.144
- 100" when "102 to 112" is set in
Pr.144
; and the value is "4" when
Pr.37
= 0 and
Pr.144
= 0.
Pr.505
is always set as frequency (Hz).
Use
Pr.811 Set resolution switchover
to change the increment from 1 r/min to 0.1 r/min. (
Pr.811
is only available for the FR-A800
series.)
• When setting a speed through the FR-A8ND, the speed is calculated with the
Pr.144
setting as shown below.
When
Pr.144
= "102 to 112," the formula is calculated with the value of (
Pr.144
- 100). When
Pr.144
= "0", the formula is calculated with 4
poles.
The
Pr.811
setting is invalid. The unit 1 r/min is always applied. (
Pr.811
is only available for the FR-A800 series.)
NOTE
• To apply the unit 1 r/min to the running speed (actual speed) monitor, set the initial values in
Pr.37
and
Pr.811
.
• Refer to the Instruction Manual (Detailed) of the inverter for the details of
Pr.37
,
Pr.144
,
Pr.505
and
Pr.811
.
Pr.37
setting
Pr.144
setting
Output frequency
monitor
Set frequency
monitor
Running speed
(actual speed) monitor
Frequency setting,
parameter setting
0
(initial value)
0
0.01 Hz
0.01 Hz
1 r/min
0.01 Hz
2 to 12
0.01 Hz
0.01 Hz
1 r/min
0.01 Hz
102 to 112
0.01 Hz
0.01 Hz
1 r/min
0.01 Hz
1 to 9998
0
0.01 Hz
0.01 Hz
1 (machine speed
)
0.01 Hz
2 to 12
0.01 Hz
0.01 Hz
1 (machine speed
)
0.01 Hz
102 to 112
0.01 Hz
0.01 Hz
1 r/min
0.01 Hz
Speed value (1 r/min
) = frequency
120 / number of motor poles (
Pr.144
