YASKAWA FP65U T Series Installation & Primary Operation page 98

20 Troubleshooting
Code Name
FR<TH Freq. Reference < Thrust (Y4-12)
HCA High Current Alarm
HIAUX High PI Aux Feedback Level
HIFB High Feedback Sensed
L24v Loss of External Power 24 Supply
LCP Low City Pressure
LOAUX Low PI Aux Feedback Level
LOFB Low Feedback Sensed
LoG Com Error / Abnormal SD Card
LOP Loss of Prime
LSP Low Suction Pressure
LT-1 Cooling Fan Maintenance Time
LT-2 Capacitor Maintenance Time
LT-3 SoftChargeBypassRelay MainteTime
LT-4 IGBT Maintenance Time (50%)
98
Causes
The drive frequency reference setting is less than the
value set in Y4-12 [Thrust Frequency] in these
conditions:
• The drive is not in PI Mode
• The drive is running
• Thrust is enabled (Y4-11 [Thrust Acceleration
Time] > 0.00 and Y4-12 > Y1-06 [Minimum
Speed])
The load is too heavy.
PI Auxiliary Feedback is more than the level set in
YF-12 [PI Aux Control High Level Detect] for the
time set in YF-13 [PI Aux High Level Detection Time]
in these conditions:
• The drive is running.
• The output frequency > 0.
The feedback level is more than the level set in Y1-11
[High Feedback Level].
The voltage of the backup 24 V power supply has
decreased. The main circuit power supply is operating
correctly.
Insufficient pressure is present on the inlet to the
pump in these conditions:
• Y4-24 = 0 [Low City Alarm Text = Low City
Pressure]
• The terminal set for H1-xx = B8 or 1B8 [MFDI
Function Selection = Low City Pressure or !Low
City Pressure] activates
When the drive is running, PI Auxiliary Feedback is
less than the level set in YF-09 [PI Aux Control Low
Lvl Detection] for the time set in YF-10 [PI Aux
Control Low Lvl Det Time].
The feedback level is less than the level set in Y1-08
[Low Feedback Level] for the time set in Y1-09 [Low
Feedback Lvl Fault Dly Time].
There is not a micro SD card in the keypad.
The drive used the method set in Y1-18 [Prime Loss
Detection Method] to detect that the pump load is less
than the level set in Y1-19 [Prime Loss Level] for the
time set in Y1-20 [Prime Loss Time], and the output
frequency is Y1-21 [Prime Loss Activation Freq] or
more.
An external input has indicated that an insufficient
suction pressure condition exists in these conditions:
• Y4-24 = 1 [Low City Alarm Text = Low Suction
Pressure]
• The terminal set for H1-xx = B8 or 1B8 [MFDI
Function Selection = Low City Pressure or !Low
City Pressure] activates
The cooling fan is at 90% of its performance life
estimate.
The capacitors for the main circuit and control circuit
are at 90% of their performance life estimate.
The soft charge bypass relay is at 90% of its
performance life estimate.
The IGBT is at 50% of its performance life estimate.
YASKAWA TOEPC7106171GA FP605 Drive Installation & Primary Operation
Possible Solutions
Increase the frequency reference to a value more than Y4-12.
• Decrease the load for applications with repetitive starts and
stops.
• Replace the drive with a larger capacity model.
• Decrease the PI Auxiliary Feedback level to less than YF-12.
• Set YF-12 and YF-13 correctly.
• Decrease the feedback level to less than Y1-11 - Y1-14
[Hysteresis Level].
• Set Y1-11 and Y1-12 correctly.
• Examine the external 24 V power supply for disconnected wires
and wiring errors and repair the problems.
• Examine the external 24 V power supply for problems.
• Examine the pressure switch contact for correct operation.
• Examine control wiring to drive terminal strip from pressure
switch contact.
• Make sure that suction pressure is present with an isolated
measuring device.
• Set Y4-22 [Low City On-Delay Time] and Y4-23 [Low City Off-
Delay Time] correctly.
• Deactivate the digital input terminals set to H1-xx = B8 or 1B8.
• Increase the PI Auxiliary Feedback level more than YF-09.
• Set YF-09 and YF-10 correctly.
• Increase the feedback level to more than Y1-08 + Y1-14 [High
Feedback Hysteresis Level].
• Set Y1-08 and Y1-09 correctly.
Put a micro SD card in the keypad.
• Examine a dry well, air in the system, or no water in the system.
Use preferred priming method suggested by the pump
manufacturer to restart the pump.
• When there is resistance in the pump, allow the system to pump
water again.
• Set Y1-18 to Y1-21 correctly.
• Examine the pressure switch contact for correct operation.
• Examine control wiring to drive terminal strip from pressure
switch contact.
• Make sure that suction pressure is present with an isolated
measuring device.
• Increase the system pressure.
• Set Y4-22 [Low City On-Delay Time] and Y4-23 [Low City Off-
Delay Time] correctly.
• Deactivate the digital input terminals set to H1-xx = B8 or 1B8.
1. Replace the cooling fan.
2. Set o4-03 = 0 [Fan Operation Time Setting = 0 h] to reset the
cooling fan operation time.
Replace the control board or the drive. For information about
replacing the control board, contact Yaskawa or your nearest sales
representative.
Replace the control board or the drive. For information about
replacing the control board, contact Yaskawa or your nearest sales
representative.
Check the load, carrier frequency, and output frequency.