YASKAWA iQpump1000 User Manual page 277

HOA Keypad Display
The suction pressure has fallen below the
level set in Q5-09 for longer than the time
set in Q5-10. This is only effective when
Q5-11, Low Suction Pressure Behavior
Select is set to 1 (alarm).
HOA Keypad Display
Low City Pressure
Cause
Insufficient pressure is present on the inlet
to the pump.
Shown when P4-24 = 0 and when the digital
input has been active (closed for P4-21 = 0,
or open for P4-21 = 1) for the time set in
P4-22.
HOA Keypad Display
Low Feedback Low FB Sensed
Cause
The feedback level has dropped below the
level set in P1-08, Low Feedback Level
This is only effective when P1-10, Low
Feedback Selection, is set to 1 (Alarm and
digital out).
HOA Keypad Display
Low Suction Pressure
Cause
Insufficient suction pressure is present.
Shown when P4-24 = 1 and when the digital
input has been active (closed for P4-21 = 0,
or open for P4-21 = 1) for the time set in
P4-22.
HOA Keypad Display
Low Water in Tank
Cause
Insufficient pressure is present on the inlet
to the pump.
Shown when P4-24 = 2 and when the digital
input has been active (closed for P4-21 = 0,
or open for P4-21 = 1) for the time set in
P4-22.
HOA Keypad Display
Low WL/SP/PI-Aux Drive Disabled
Cause
Drive is not allowed to run in MEMOBUS
multiplex when P9-51 is set to 1, the Water
Level or Suction Pressure is below the
Q4-06/Q5-06/Q6-06 setting, and the drive
is stopped or running as a lag drive.
YASKAWA TOEP YAIP1W 01F YASKAWA AC Drive - iQpump1000 User Manual
• Increase the system pressure.
• Set the Low Suction alarm characteristics in Q5-09, Q5-10, and Q5-18. Q5-10 Detection Delay Time only
applies if Q5-01 = 2.
• Drive response to this condition is controlled by Q5-11, Low Suction Pressure Behavior Select.
Low City Pressure
• Check pressure switch contact for correct operation.
• Check control wiring to drive terminal strip from pressure switch contact.
• Check to make sure that suction pressure is present by means of a separate measuring device.
Low Feedback Level Alarm
The feedback signal is too low.
• Increase the feedback signal.
• Set the Low Feedback alarm characteristics in P1-08 and P1-09.
• Drive response to this condition is controlled by P1-10, Low Feedback Selection.
Low Suction Pressure
• Check pressure switch contact for correct operation.
• Check control wiring to drive terminal strip from pressure switch contact.
• Check to make sure that suction pressure is present by means of a separate measuring device.
Note: The following possible solutions apply to drive software versions PRG: 8551 and earlier.
• Increase the system pressure.
• Set the Low Suction alarm characteristics in Q5-09 and Q5-18.
• Drive response to this condition is controlled by Q5-11, Low Suction Pressure Behavior Select.
Low Water in Tank
• Check pressure switch contact for correct operation.
• Check control wiring to drive terminal strip from pressure switch contact.
• Check to make sure that suction pressure is present by means of a separate measuring device.
• Raise the water level.
• Set the Low Water Level alarm characteristics in Q4-09.
• Drive response to this condition is controlled by Q4-11, Low Level Behavior.
Low Water Level / Suction Pressure / Aux PI Feedback Disabled
Water Level or Suction Pressure is below the Q4-06/Q5-06/Q6-06 setting.
• Confirm that the Water Level, Suction Pressure, or Aux PI Feedback source is installed and working
properly.
• Wait for the WL/SP/PIAuxFB to recover.
Minor Fault Name
Minor Fault Name
Possible Solution
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solution
Minor Fault Name
Possible Solution
Fault Name
Possible Solution
5.3 Alarm Detection
277
5