Yaskawa iQpump Micro - Manual (Page 156)

n P4-03: Pre-Charge Time
Sets the duration of time that the Pre-Charge function will run.
No. Parameter Name Setting Range Default
P4-03 Pre-Charge Time 0.0 to 3600.0 min 0.0 min
The following conditions must be met to enter Pre-Charge Mode:
• Drive Ready or Sleeping (Run command, not faulted, not in program mode)
• NOT in HAND Mode
• “Disable Pre-charge” digital input NOT closed
• P4-03 > 0.0
• If P4-01, Pre-Charge Level, is greater than 0, the PID feedback must be below the P4-01 level. (Forward acting PID, b5-09
= 0, Reverse acting PID, b5-09 = 1).
When the drive enters Pre-Charge Mode 1 and 2, the drive runs at the Pre-Charge frequency set in P4-02/P4-06, the PID
controller is disabled and the Pre-Charge digital output (H2-0o = A4) closes.
When pre-charge is active, the message “Pre Chg Mode Exit in Xsec” appears on the keypad to show how long before pre-
charge exits via timers (P4-03 + P4-07).
Additionally, during Pre-Charge Mode:
• When Pre-charge Level 2 (P4-32) is set to 0, the system can exit Pre-charge when the PID Feedback goes above the Pre-
charge Level (P4-01) in normal PID operation, or below the P4-01 level in inverse PID operation.
However, when Pre-charge Level 2 (P4-32) is set to a non-zero value, the system goes into Pre-Charge 2 instead when Pre-
Charge 1 completes via timer (P4-03) or level (P4-01). At this point, the drive will run at Pre-charge Frequency 2 (P4-06).
The system can exit Pre-charge 2 when the PID Feedback goes above the Pre-charge Level 2 (P4-32) in normal PID operation,
or below the P4-32 level in inverse operation. Refer to Figure 4.58 and Figure 4.59 for more information.
• When P4-02, Pre-Charge Frequency, or P4-06, Pre-Charge Frequency 2, are set to a value less than P1-06, Minimum Pump
Speed, the alarm “Freq. Ref < Pump Min P1-06” is displayed and the drive runs at the minimum speed.
• When Pre-Charge Loss of Prime parameters P4-05 and P4-08 are set to 0, the Loss of Prime detection is disabled.
• When Pre-Charge Loss of Prime parameters P4-05 or P4-08 are set to a value greater than 0, Loss of Prime detection will
operate after the output speed reaches the Pre-Charge Frequency set in P4-02 or P4-06.
• The “Low Water” fault (H1-0o = 8F) is disabled.
• The “Low Feedback” fault is disabled when forward-acting PID is selected (b5-09 = 0) and the “High Feedback” fault is
disabled when reverse-acting PID is selected (b5-09 = 1).
• The “Not Maintaining Setpoint” fault is disabled.
• The “Feedback Loss” detection (4 to 20 mA wire break) is enabled, however, the Pre-Charge frequencies will override and
the b5-13 “feedback loss goto speed”.
The drive will always exit Pre-Charge Mode when Pre-Charge times P4-03 and P4-07 have expired. The drive will also exit
Pre-Charge Mode when one of the following conditions are met:
• P4-03 and P4-32 are set to 0.0
• The “Disable Pre-Charge” digital input (H1-0o = 8C) closes.
• A digital input programmed to “Low Water” (H1-0o = 8F) is deactivated (open when P1-30 = 0 or closed when P1-30 =
1).
• The PID feedback satisfies both Pre-charge levels 1 and 2 (all must be true):
Pre-charge timers P4-03 and P4-07 have NOT expired
PID is enabled (b5-01 > 0).
PID is NOT disabled via digital input
Pre-Charge Level Set (P4-01 > 0) (and if used, P4-32 > 0)
Feedback is greater than Pre-Charge Level (P4-01) and Pre-charge Level 2 (P4-32) (forward-acting PID, b5-09 = 0) or less
than Pre-Charge Levels 1 and 2 (reverse-acting PID, b5-09 = 1)
Drive is NOT in a “Feedback Loss” condition (4 to 20 mA wire-break detection).
4.8 Detailed iQpump Parameter Descriptions
156 YASKAWA TOEP YAIQPM 03B YASKAWA AC Drive - iQpump Micro User Manual