HOA Keypad Display
Minor Fault Name
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).
• 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.
HOA Keypad Display
Minor Fault Name
LOWFL
Low Flow
Low Flow
Cause
Possible Solution
Insufficient flow
Increase flow
After waiting the P6-08 delay time at start,
the measured water flow has fallen below
the P6-06 level for the time set in P6-07.
This is only effective when P6-09, Low
Flow Select is set to 1 (Alarm only).
• Set the Low Flow fault characteristics in P6-06, P6-07, and P6-08.
• Drive response to this condition is controlled by P6-09, Low Flow Select.
• Auto-restart of this fault is controlled by P6-09, Low Flow Select and P6-10, Low Flow Auto-restart Time.
HOA Keypad Display
Minor Fault Name
Low Suction Pressure
Low Suction Pressure
Cause
Possible Solution
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.
• 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.
HOA Keypad Display
Minor Fault Name
Low Water in Tank
Low Water in Tank
Cause
Possible Solution
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.
• 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.
HOA Keypad Display
Minor Fault Name
LOWWL
Low Water Level
Low Water Level
Cause
Possible Solution
The water level has fallen below the level
set in Q4-09 for the longer than the time set
in Q4-10. This is only effective when
Q4-11, Low Level Behavior is set to 1
(Alarm).
• Raise the water level.
• Set the Low Water Level fault characteristics in Q4-09 and Q4-10.
• Drive response to this condition is controlled by Q4-11, Low Level Behavior.
• Auto-restart of this fault is controlled by Q4-11, Low Level Behavior and Q4-12 Water Level Control
Auto-restart Time.
HOA Keypad Display
Minor Fault Name
LT-1
Cooling Fan Maintenance Time
The cooling fan has reached its expected maintenance period and may need to be replaced.
Note:
An alarm output (H2-
oo
= 10) will only be triggered if both (H2-
oo
= 2F and H2-
oo
=
10) are set.
Cause
Possible Solution
The cooling fan has reached 90% of its
expected performance life.
Replace the cooling fan and set o4-03 to 0 to reset the Maintenance Monitor.
5.4 Alarm Detection
206
YASKAWA TOEPYAIUPW01A YASKAWA AC Drive - U1000 iQpump Matrix Drive User Manual
