YASKAWA HV600 Series Installation & Primary Operation page 109

Code Name
HCA High Current Alarm
HIAUX High PI Aux Feedback Level
HIFB High Feedback Sensed
INTLK BAS Interlock
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%)
LWT Low Water In Tank
YASKAWA TOEPC71061732E HV600 Drive Installation & Primary Operation
Causes
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 operates in AUTO Mode.
• The output frequency > 0.
The feedback level is more than the level set in Y1-11
[High Feedback Level].
The digital input terminal set to H1-xx = B2 [MFDI
Function Selection = BAS Interlock] deactivates.
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 operates in AUTO Mode or HAND
Mode, 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]
and the drive is running.
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 pump load that measured based on the Y1-18
[Prime Loss Detection Method] setting 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.
An external input has indicated that the water level in
the tank is too low in these conditions:
• Y4-24 = 2 [Low City Alarm Text = Low Water in
Tank]
• The terminal set for H1-xx = B8 or 1B8 [MFDI
Function Selection = Low City Pressure or !Low
City Pressure] activates
19 Troubleshooting
Possible Solutions
• 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.
Make sure the cause of interlock.
• 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.
• Make sure that 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.
• Make sure that 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.
• Examine the pressure switch contact for correct operation.
• Make sure that control wiring to drive terminal strip from
pressure switch contact.
• Make sure that suction pressure is present with an isolated
measuring device.
• Increase the water level.
• 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.
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