YASKAWA iQpump1000 - Page 236

• 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).
Run Command
Pre-Charge Level 2 (P4-32)
Pre-Charge Level (P4-01)
PID Feedback
Output Frequency
“Pre-Charge
Active” Message
& Digital Output
(H2-0X = A4)
P4-02 Pre-Charge Frequency
P4-06 Pre-Charge Frequency 2
P4-07
Pre-Charge Time 2
P4-03
Pre-Charge Time
b5-01 PID Select = 1 (Enabled) AND b5-09 Output Level Sel = 0 (Normal Character)
Figure 4.46 Pre-Charge 1 and 2 Complete via PID Feedback
Run Command
“Pre-charge
Active”
Message &
Digital Output
(H2-0x = A4)
Output Frequency
P4-03
Pre-Charge Time
P4-02 – Pre-Charge Frequency
Pre-charge Level (P4-01)
b5-01 PID Select = 1 (Enabled) AND b5-09 Output Level Sel = 0 (Normal Character)
PID Feedback
Pre-charge Level 2 (P4-32)
P4-07
Pre-Charge Time
P4-06 – Pre-charge Frequency 2
Figure 4.47 Pre-Charge 1 Complete via PID Feedback & Pre-Charge 2 via Timer
4.7 Basic iQpump Setup and Application Preset Parameters
236
YASKAWA TOEP YAIP1W 01F YASKAWA AC Drive - iQpump1000 User Manual