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Differential Level Detection
Differential Level Detection detects the pressure difference between the PID Feedback (H3-oo = B) and a secondary pressure
feedback device (H3-oo = 28).
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Enable Differential Level Detection
Ensure that all of the following conditions are met to enable Differential PI Feedback Detection:
• P4-18 > 0
•
Program the Differential Feedback analog input (H3-oo = 28)
• The drive is not in Anti-Jam or De-scale operation
• For Direct-Acting PID, the drive is running in AUTO mode (including sleep boost and feedback drop detection)
For Inverse-Acting PID, the drive has a Run command present.
With detection enabled, the drive detects the pressure difference between the PID Feedback and the Differential Feedback
(H3-oo = 28).
The digital output programmed for “Differential Det” (H2-oo = A1) closes when the difference exceeds the level set in P4-18
for the time set in P4-19.
The drive responds depending on the setting for P4-20 (Differential Detection Selection)
The drive triggers a “Differential FB Detected” alarm and closes the digital output when P4-20 is set to 1 (Alarm).
The drive triggers a “DIFF Difference Det” fault and closes the digital output when P4-20 is set to 0 (Fault) The digital output
stays closed while the “DIFF Difference Det” fault is active and will open when the difference falls below the P4-18 setting
for 1 s or when detection feature is disabled.
The drive triggers the digital output only when P4-10 is set to 2 (Digital Out Only).
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Related Parameters
No. Parameter Name Setting Values
P4-18 Differential Level
Default: 10.0
Range: 0.0 to 6000.0
P4-19 Differential Level Detection Time
Default: 10 s
Range: 0 to 3600 s
P4-20 Differential Level Detection Selection
Default: 0
Range: 0 to 2
U1-81 Differential PI Feedback –
H2 Multi-Function Digital Output Settings
H2-oo
Function Description
A1 Differential Det
Closed: The difference between the PID Feedback and the Differential Feedback (H3-oo = 28) exceeded
the P4-18 level for the time set in P4-19.
H3 Multi-Function Analog Input Settings (H3-02/H3-06/H3-10)
H3-oo
Function Description
28 Differential PI Feedback Full scale: FB Device Scaling (P1-03)
4.6 iQpump Presets and Functions
YASKAWA TOEP YAIP1W 01F YASKAWA AC Drive - iQpump1000 User Manual
209
4
Start-Up Programming
& Operation
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