Output Frequency And Acceleration/Deceleration Time - Mitsubishi Electric FR-A700 Technical Manual

2.5 Output frequency and acceleration/deceleration
time
2.5.1 Output frequency range [Pr. 1, 2, 13, 18, 571]
Output frequency range is from 0.2 to 400Hz (0.5 to 400Hz for
). Note that actual operating frequency is depending on
F700
parameter settings and operation mode as follows.
For PU operation mode, three-speed operation and
multi-speed operation of External operation mode, and
for network operation mode, output up to 400Hz is
available, though output frequency is limited by
maximum frequency setting.
For analog input of External operation mode, output
frequency is limited by frequency setting gain frequency
[Pr. 125] (or [Pr. 126]) and maximum frequency setting.
Frequency at start is set in [Pr. 13].
When decreasing the frequency command at constant
speed, frequency up to 0.5Hz (when [Pr. 13
or up to [Pr. 13] setting (when [Pr. 13
output.
When decreasing to stop with start signal OFF, up to
DC injection brake operation frequency set in [Pr. 10] is
output. And when decreasing to stop with frequency
command 0Hz (with start signal ON), up to the above
mentioned frequency at constant speed is output.
(1) Maximum frequency [Pr. 1, 18]
Set the maximum frequency for output using the
operation panel (parameter unit). Set the maximum
frequency limit of 0 to 120Hz in [Pr. 1].
Set the maximum frequency limit of 120 to 400Hz in
[Pr. 18]. Parameter setting written in the last time
between [Pr. 1] or [Pr. 18] is the valid maximum output
frequency.
Maximum frequency for output is as follows.
1) For external analog input (voltage, current signal)
Lower frequency between maximum frequency
[Pr. 1] (or [Pr. 18]) setting and frequency setting
gain frequency [Pr. 125] (or [Pr. 126]) is the actual
maximum output frequency. The output frequency
is clamped at the maximum frequency limit if the
frequency setting input given is higher than the
maximum frequency limit.
2) For using operation panel (parameter unit)
Maximum frequency [Pr. 1] (or [Pr. 18]) setting is
the maximum output frequency.
[Pr.] Name
1 Maximum frequency
2 Minimum frequency
High speed
18
maximum frequency
0.5Hz])
0.5Hz]) is
Initial Value
55K or less 120Hz
75K or more 60Hz
0Hz
55K or less 120Hz
75K or more 60Hz
common
(common)
(2) Minimum frequency [Pr. 2]
Using the operation panel (parameter unit), set the
minimum frequency limit that can be output during
constant-speed
frequency setting input signal is used, the output
frequency is clamped and does not drop below the
minimum frequency limit if that frequency setting
input signal is less than the minimum frequency limit
in [Pr. 2 Minimum frequency] (this also applies to the
input of 0). Any value less than the minimum
frequency limit may be set from the operation panel
(parameter unit) but the output frequency does not
become less than the minimum frequency limit. (with
the exception of the Jog frequency)
Note that when [Pr. 2 Minimum frequency] is set to any
value equal to or more than [Pr. 13 Starting frequency],
simply turning ON the start signal will accelerate the
motor to the set frequency of [Pr. 2 Minimum frequency]
according to the set acceleration time even if the
command frequency is not input.
When stall prevention is activated to decrease the
output frequency, the frequency may drop to [Pr. 2] or
below.
Output frequency
(Hz)
[Pr.1]
[Pr.18]
[Pr.2]
0
(4mA)
Clamped at the
minimum frequency
Setting Range
0 to 120Hz Set the upper limit of the output frequency.
0 to 120Hz Set the lower limit of the output frequency.
Set when performing the operation at 120Hz or
120 to 400Hz
more.
232
PARAMETER
operation. When the
Clamped at the
maximum frequency
Frequency setting
5, 10V
(20mA)
Description
analog