YASKAWA U1000 iQpump Drive - Sleep and Anti-No-Flow (ANF) Detection; Verify No-Flow Pressure Hold; Adjust Pressure Drop Detection (P2-25); Verify ANF Timer Operation

YASKAWA TOEPYAIUPW02A U1000 iQpump Drive Quick Start Procedure
U1000 iQpump Drive
Quick Start Procedure
Page 23
of 25

Sleep and Anti-No-Flow (ANF) Detection (P2-23, P2-24, P2-25)
13
STEP
Note: Before adjusting Anti-No-Flow operation, ensure the system is regulating satisfactory while operating under normal running
conditions.
If the system is stable, continue to Step 13.1 to verify no-ow/sleep operation. If the system is unstable, turn off the Anti-No-Flow
function (P2-23 = 0.00 %) and adjust the PI control parameters, b5-02 and b5-03 to stabilize the pump system. Refer to the U1000
iQpump Drive User Manual (Document No. TOEPYAIUPW01) for additional information. After the system is stabilized, re-enable the
Anti-No-Flow function by setting P2-23 to 0.40 % and continue to Step 13.1 to verify no-ow/sleep operation.
13.1 Verify system holds pressure by creating a no-ow situation (e.g. close off discharge valve).
13.2 Press OFF button on the HOA keypad, wait 1 minute until system stabilizes and verify system pressure feedback U1-91. If the
pressure drops more than 3 PSI (U1-91) adjust P2-25 to the actual delta pressure drop plus 1 PSI.
Example: Setpoint is 80 PSI. Pressure feedback U1-91 displays 76 PSI. P2-25 should be 4 + 1 or 5 PSI.
Note: The pump system will continue to cycle on and off if this value is not greater than the start level (P1-04). The system
pressure is not holding and needs correction if this occurs.
13.3 Run system in normal automatic operation with ow. Check monitor U1-99 “ANF Timer” and verify that the value is incrementing
and resetting back to zero continuously. If the value holds at 10 seconds (P2-24), increase P2-24 “Anti-No-Flow Detection
Time” by increments of 5 seconds. Repeat Step 13.3 each time P2-24 is adjusted.
13.4 Create a no-ow situation, (e.g. close discharge valve), and monitor that U1-99 “ANF Timer” increments and holds at P2-24
time (value set in Step 13.3). Once the Anti-No-Flow timer expires, the speed will reduce gradually until it reaches minimum
pump speed (P1-06) where it will hold for 5 seconds (P2-03) before going to sleep.
13.5 Run the system in normal automatic operation and verify sleep and wake-up operation until the system performs satisfactory.