YASKAWA TM.iQp.07 iQpump Controller Programming Manual 221
the timer is equal to or greater than the De-Scale Pump Run Time parameter (P7-10) value, the drive will automatically perform the De-
Scale Function the next time the drive comes out of zero speed in the “Auto” mode.
For the whole time the drive is executing the De-Scale function, the “De-Scale Active” alarm will flash on the display. The drive will first
accelerate using the De-Scale Acceleration Time (P7-08) time. It will then decelerate using the De-Scale Deceleration Time (P7-09).
Once the drive reaches zero speed, it will immediately repeat the cycle for as many times as specified by the Anti-Jam / De-Scale Cycle
Count (P7-02) parameter.
During the De-Scale Function, many iQpump features are disabled: Thrust Bearing, PI control, Pre-charge, Low Feedback fault and Not
Maintaining Setpoint fault. The other protective functions, however, will remain active.
If the De-Scale function is interrupted by a fault or by removing the run command, all timers associated with the De-Scale function will
be reset.
The “Not Maintaining Setpoint”, “Loss Of Prime”, and “Low Feedback” faults will be disabled while the drive is performing the De-
Scale operation.
The De-Scale run timer will be stored to EEPROM when:
• Once per hour that the drive is running
• Right after a successful De-Scale Cycle (timer set to zero then stored to EEPROM)
• If the run command is removed during a De-Scale Cycle (timer set to zero then stored to EEPROM)
• If a fault occurs during the De-Scale Cycle (timer set to zero then stored to EEPROM)
Forced De-Scale Operation: When parameter P7-01 = 3 (Forced De-Scale), the drive will perform a De-Scale every time it starts. This
mode is intended to be used during the setup of the De-Scale function only. The internal De-Scale run timer is forced to zero (reset) when
the drive is in this mode.
Figure 1.166
Figure 170. Anti-Jam Function Enabled (P7-01 = 1) - Anti-Jam Fault
Run
Command
Output
Frequency
Anti-Jam
Alarm
Anti-Jam Function Enabled (P7-01 = 1) – Anti-Jam Fault
Output
Current
P7-04
PwrL Baseblock t
L2-03
P7-04
L2-03
P7-04
L2-03
P7-04
L2-03 L2-03
P7-04P7-04
AJF
Anti-Jam Fault
Anti-Jam Det. Current
P7-03
C
1
-
0
1
*
C
1
-
0
1
*
* Acceleration rate will be un -modified by the anti -jam function. If the
Trust Bearing feature is enabled , the acceleration rate will be P 4-04.
P7-02 = 3
A-J Cycle Count
Cycle
1
Cycle
2
Cycle
3
(522 pages)
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