YASKAWA iQpump1000 User Manual page 194

4.6 iQpump Presets and Functions
u
De-Scale/De-Ragging
The De-scale/De-ragging function attempts to clean the pump impellers (dislodge scale and buildup) by rapidly starting and
stopping the pump in both directions. The drive monitors the number of operating hours of the motor and after a set amount
of operating time, the drive runs the De-scale/De-ragging function the next time the drive is started in either the HAND or
AUTO mode.
The De-scale/De-ragging function runs the drive forward, then reverse for a specified number of times before normal operation
will automatically resume.
The De-Scale/De-ragging function operates when all of the following conditions are met:
• P8-01 = 1: De-Scale is Enabled
• P1-01 ≠ 3: Not in MEMOBUS Multiplex
• P7-01 = 0: Anti-Jam Disabled
n De-Scale/De-Ragging Operation
While the pump is running in the Hand or Auto mode, the De-scale/De-ragging run timer is activated. The timer data is stored
in EEPROM at power-down. If the amount of time accumulated in the timer is less than the De-Scale Pump Run Time parameter
(P8-08), the drive starts normally. When the timer is equal to or greater than the P8-08 value, the drive will automatically
perform the de-scale function the next time the drive is at a stop and is commanded to accelerate in HAND or AUTO mode.
The "De-Scale/De-rag Active" alarm will flash on the keypad during the De-scale/De-ragging function. The drive will first
accelerate using the De-scale Acceleration Time (P8-06) up to the De-scale Run Frequency Reference (P8-03), for the De-
scale Forward Run Time (P8-04) time. It will then decelerate using the De-scale Deceleration Time (P8-07) and accelerate
using P8-06 in the reverse direction. It will stay running at the P8-03 speed for the time set in the De-Scale Reverse Run Time
(P8-05). After the timer expires, drive will decelerate to zero using P8-07. Once it reaches zero speed, it will immediately
repeat the cycle for as many times as specified by the De-scale cycle count (P8-02) parameter. If the De-scale/De-ragging
function is interrupted by a fault or by removing the run command, all timers associated with the De-scale/De-ragging function
will be reset.
During de-scaling / de-ragging operation, the following features are disabled:
• PI Control (pressure control)
• Thrust Bearing Acceleration
• Minimum Speed
• Low Feedback / High Feedback Detection
• Not Maintaining Setpoint Detection
• Loss of Prime
• Low Flow / High Flow Detection
• Level Control / Suction Control / Vacuum Control
• Sleep Detection
• Sleep Boost
n Forced De-Scale/De-Ragging Operation
When parameter P8-01 = 2 (Force De-scale), the drive will perform a De-scale/De-ragging operation every time it starts. This
mode is intended to be used during the setup of the De-scale/De-ragging function only.
n Related Parameters, Multi-Function Digital Output Settings, and Alarms
No.
P8-01 De-scale Operation Selection
P8-02 De-scale Cycle Count
P8-03 De-scale Frequency Reference
P8-04 De-scale Forward Run Time
P8-05 De-scale Reverse Run Time
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Parameter Name
YASKAWA TOEP YAIP1W 01F YASKAWA AC Drive - iQpump1000 User Manual
Setting Values
Default: 0
Range: 0 to 2
Default: 1
Range: 1 to 100
Default: 25.00 Hz
Range: 0.0 to 400.0
Default: 10 s
Range: 1 to 6000
Default: 10 s
Range: 1 to 6000