Troubleshooting
6
6.6 Minor Faults/Alarms
YASKAWA SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference 503
Code Name Causes Possible Solutions
INTLK BAS Interlock
The digital input terminal set to H1-xx = B2 [MFDI
Function Selection = BAS Interlock] deactivates.
Make sure the cause of interlock.
Note:
• If the drive detects this error, the terminal set to H2-01 to H2-03 = 10 [MFDO Function Selection = Alarm] will activate.
• If the drive detects this error, will not flash.
Code Name Causes Possible Solutions
L24v Loss of External Power 24 Supply
The voltage of the backup 24 V power supply has
decreased. The main circuit power supply is operating
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.
Note:
• Set o2-23 [External 24V Powerloss Detection] to enable or disable L24v detection.
• The drive will not output an alarm signal for this alarm.
Code Name Causes Possible Solutions
LCP Low City Pressure
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
• 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.
Note:
• If the drive detects this error, the terminal set to H2-01 to H2-03 = 10 [MFDO Function Selection = Alarm] will activate.
• If the drive detects this error during run, it coasts to stop and does not operate until the digital input has deactivated for the time set in Y4-22.
Code Name Causes Possible Solutions
LOAUX Low PI Aux Feedback Level
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.
• Increase the PI Auxiliary Feedback level more than YF-09.
• Set YF-09 and YF-10 correctly.
Note:
If the drive detects this error, the terminal set to H2-01 to H2-03 = 10 [MFDO Function Selection = Alarm] will activate.
Code Name Causes Possible Solutions
LOFB Low Feedback Sensed
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].
• Increase the feedback level to more than Y1-08 + Y1-14 [High
Feedback Hysteresis Level].
• Set Y1-08 and Y1-09 correctly.
Note:
• If the drive detects this error, the terminal set to H2-01 to H2-03 = 10 [MFDO Function Selection = Alarm] will activate.
• If the drive detects this fault, it will respond as specified by the setting of Y1-10 [Low Feedback Selection].
Code Name Causes Possible Solutions
LoG Com Error / Abnormal SD Card
There is not a micro SD card in the keypad. Put a micro SD card in the keypad.
• The drive is connected to USB.
• The number of log communication files is more
than 1000.
• The micro SD card does not have available
memory space.
• The line number data in a log communication file
was changed.
• A communication error between the keypad and
drive occurred during a log communication.
Set o5-01 = 0 [Log Start/Stop Selection = OFF].
Note:
If the drive detects this error, the terminal set to H2-01 to H2-03 = 6A [MFDO Function Selection = Data Logger Error] will activate.
Code Name Causes Possible Solutions
LOP Loss of Prime
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.
• 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.
Note:
• If the drive detects this error, the terminal set to H2-01 to H2-03 = 10 [MFDO Function Selection = Alarm] will activate.
• If the drive detects this fault, it will respond as specified by the setting of Y1-22 [Prime Loss Selection].
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