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IM FG410-01EN

4. BASIC OPERATION

4.7.11 SettingPWM

The duty of square waves and pulse waves varies according to the instantaneous value of the

modulation signal.

For the manipulation methods that are common with the modulation setting screen, refer to p.74

and p.76 .

a) PWMexample

The duty of the output signal grows larger when the modulation signal swings to the positive side.

Modulation sync signal

(during internal modulation)

Output signal

Modulation signal

b) SelectingPWM

When [Mode] (modulation mode) is

set to [Modulation] (modulation), set

[Type] (modulation type) on the 2nd

page of the setting screen to [PWM]

(PWM).

c) Waveforms for which PWM is not possible

PWM is possible only for square waves and pulse waves.

PWM is not possible for other waveforms.

d) SettingitemsrequiredforPWM

Set [Duty] (carrier duty) on the 1st page of the setting screen.

Set [Deviation] (peak duty deviation) on the 2nd page of the setting screen.

The output duty varies in the range of carrier duty ± peak duty deviation.

When the pulse wave is used, the pulse width of the carrier is fixed to the duty setting and cannot be

set with time.

If [Source] (modulation source) is set to [Int] (internal), set [ModFctn] (modulation waveform) and

[ModFreq] (modulation frequency).

If [Source] (modulation source) is set to [Ext] (external), input the modulation signal to the external

modulation/addition input terminal. In the case of ±1 V input, the prescribed peak duty deviation

results.

Select [PWM] in

[Type] and then

press the ENTER

key.

YOKOGAWA FG420 User Manual

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