YASKAWA iQpump1000 - Page 136

4.
Set the pre-charge timer in P4-03. When the drive goes into pre-charge mode, no low-water switch is wired to the
drive, and if the pre-charge level (P4-01) cannot be obtained, the drive will exit the pre-charge function after the P4-03)
time and begin normal PI control
5.
A multi-function digital input can be wired to and programmed for Pre-charge Disable if required (H1-oo = 8C).
Parameter P1-30 configures the switch type (0: Normally Open, 1: Normally Closed).
6.
A multi-function digital output can be wired to and programmed to close whenever the pre-charge function is active
(H2-oo = A4).
Conditions for Entering 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.
• Pre-charge time set greater than zero (P4-03 > 0)
• If the Pre-charge level is greater than zero (P4-01 > 0) and the PID feedback is below the P4-01 level (Forward acting PID,
b5-09 = 0).
• If the Pre-charge level is greater than zero (P4-01 > 0) and the PID feedback is above the P4-01 level (Reverse acting PID,
b5-09 = 1).
Operation During Pre-Charge Mode
• Drive will run at the Pre-Charge frequency (P4-02).
• The PID controller is disabled.
• The HOA keypad will display the message “Pre Chg Mode – Pre-chg Active”.
•
The pre-charge digital output (H2-0o = A4) will close
• If the Pre-Charge frequency (P4-02) is set less than minimum pump speed (P1-06), an alarm “Freq. Ref < Pump Min P1-06”
will be displayed and the drive will run at the minimum pump speed.
Conditions for Exiting the Pre-Charge Mode
• When Pre-charge timer expires (P4-03). The drive will always exit after the pre-charge timer expires.
•
When the “Disable Pre-Charge” digital input (H1-oo = 8C) is closed, even momentarily
• When the PID feedback satisfies Pre-charge level (P4-01):
Feedback is greater than Pre-Charge Level (P4-01) (forward-acting PID, b5-09 = 0)
Feedback is less than Pre-Charge Level (P4-01) (reverse-acting PID, b5-09 = 1)
•
When the “Low Water” digital input (H1-oo = 8C) deactivates. A digital input must be programmed to “Low Water”
(H1-0o = 8F). The input is configured in P1-30 (0: normally open, 1: normally closed).
Related Parameters
No. Parameter Name Setting Values
P4-01 Pre-Charge Level
Default: 0.0 PSI
Min.: 0.0
Max.: 6000.0
P4-02 Pre-Charge Frequency
Default: 0.0 Hz
Min.: 0.0
Max.: [E1-04]
P4-03 Pre-Charge Time
Default: 0.0 min
Min.: 0.0
Max.: 3600.0
P4-05 Pre-Charge Loss of Prime Level
Default: 0.0 A
Min.: 0.0
Max.: 1000.0
P4-06 Pre-Charge Frequency 2
Default: 0.0 Hz
Min.: 0.0
Max.: [E1-04]
P4-07 Pre-Charge Time 2
Default: 0.0 min
Min.: 0.0
Max.: 3600.0
4.5 iQpump Presets and Functions
136
YASKAWA TOEP YAIP1W 01A YASKAWA AC Drive - iQpump1000 Quick Start Guide