Phase sweep

First, we will explain the phase sweeping of the U phase.

To sweep the U phase, you have to set the U phase offset.

When a U phase offset is specified, the U-V phase difference, U-W phase difference, starting phase angle, and ending phase angle settings are relative to the U phase reference phase.

Setting a U phase offset causes the U-V/U-W phase difference settings to be offset from the actual phase difference.

In the following example, U phase is swept from 0° to 330° (leading) from step 1 to step 2. V and W phases will not be changed.

 

Specify the phase to sweep the U phase with the U phase offset.

STEP	0	1	2
S.PHASE [deg] Starting phase angle	FREE	FREE	FREE
E.PHASE [deg] Ending phase angle	FREE	FREE	FREE
U PHA.OFFS [deg] U phase offset	0	330	330
RAMP (U PHA.OFFS) U phase ramp	OFF	LEAD	OFF
U-V PHAS [deg] U-V phase difference	OFF	OFF	OFF
RAMP (U-V PHAS) V phase ramp	--	--	--
U-W PHAS [deg] U-W phase difference	OFF	OFF	OFF
RAMP (U-W PHAS) W phase ramp	--	--	--
PHAS. CNG sudden phase change	OFF	OFF	OFF

Because we want to advance the phase from 0° to 330° in step 1, we set the U phase offset of step 1 to 330°.

Phase sweep ramp can be set to leading (LEAD) or lagging (LAG).

Set the ramp of step 1 to LEAD. “- ” is displayed for U PHASE OFFSET.

 

The U-V phase difference and U-W phase difference are the phase difference from the U phase reference phase.

Because we are not changing the V phase and W phase, we leave their settings at off (U-V phase difference: 120°, U-W phase difference: 240°).

The U-V phase difference and U-W phase difference are phase differences from the U phase reference phase, so if we set an offset for the U phase in step 1, even if the U-V phase difference setting is 120°, the actual phase difference will be 150° (120° + 30°), which means that the phase difference setting will be offset from the actual phase difference. Likewise, the U-W phase difference setting will be offset from the actual phase difference.

The output state when the sequence is complete is the state specified in the last step. If the sequence ends with a U phase offset, as in this example, the U PH OFS icon will appear.

If the icon is displayed, be sure to press 1/2 and then U PHASE on the sequence screen to clear the offset.

 

 

Next, we will explain the phase sweeping of the V and W phases.

Specify the phase to sweep the V phase with the U-V phase difference.

Specify the phase to sweep the W phase with the U-W phase difference.

Below is an example of sweeping the V phase and an example of sweeping the U and V phases.

 

Phase sweeping only the V phase

STEP	0	1	2
S.PHASE [deg] Starting phase angle	FREE	FREE	FREE
E.PHASE [deg] Ending phase angle	FREE	FREE	FREE
U PHA.OFFS [deg] U phase offset	OFF	OFF	OFF
RAMP (U PHA.OFFS) U phase ramp	OFF	OFF	OFF
U-V PHAS [deg] U-V phase difference	120	90	OFF
RAMP (U-V PHAS) V phase ramp	OFF	LEAD	OFF
U-W PHAS [deg] U-W phase difference	OFF	OFF	OFF
RAMP (U-W PHAS) W phase ramp	--	--	--
PHAS. CNG sudden phase change	OFF	OFF	OFF

Phase sweeping the U and V phases

To sweep the U and V phases, you have to set the U phase offset. In step 1, to sweep the U phase from 0° to 30° and the V phase from 120° to 90°, even though the actual U-V phase difference is 60°, we set the U-V phase difference to 90° because this value must be set relative to the U phase reference phase when a U phase offset is set. The U-V phase difference setting is offset from the actual phase difference.

STEP	0	1	2
S.PHASE [deg] Starting phase angle	FREE	FREE	FREE
E.PHASE [deg] Ending phase angle	FREE	FREE	FREE
U PHA.OFFS [deg] U phase offset	0	30	30
RAMP (U PHA.OFFS) U phase ramp	OFF	LAG	OFF
U-V PHAS [deg] U-V phase difference	120	90	90
RAMP (U-V PHAS) V phase ramp	OFF	LEAD	OFF
U-W PHAS [deg] U-W phase difference	OFF	OFF	OFF
RAMP (U-W PHAS) W phase ramp	--	--	--
PHAS. CNG sudden phase change	OFF	OFF	OFF

 

Sequence tutorial (Cont.)

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