5.6 Minor Faults/Alarms
138 YASKAWA TOEPYAIH6B01A HV600 AC Drive Narrow Bypass Installation & Startup
Code Name Causes Possible Solutions
LOW_SUCT Low Suction Detected
The bypass detected a Low Suction condition. • Check the digital input programmed for Low Suction Switch
(Z2-0x = 42).
• Check the connected device for continuity.
• Check Bypass Digital Input Invert Settings in Z2-09 to Z2-16.
Code Name Causes Possible Solutions
LSP Low Suction Pressure
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
• 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.
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
LT-1 Cooling Fan Maintenance Time
The cooling fan is at 90% of its performance life
estimate.
1. Replace the cooling fan.
2. Set o4-03 = 0 [Fan Operation Time Setting = 0 h] to reset the
cooling fan operation time.
Note:
When the performance life estimate is expired, the terminal set to H2-01 to H2-03 = 2F [MFDO Function Selection = Maintenance Notification] will activate.
Code Name Causes Possible Solutions
LT-2 Capacitor Maintenance Time
The capacitors for the main circuit and control circuit
are at 90% of their performance life estimate.
Replace the control board or the drive. For information about
replacing the control board, contact Yaskawa or your nearest sales
representative.
Note:
When the performance life estimate is expired, the terminal set to H2-01 to H2-03 = 2F [MFDO Function Selection = Maintenance Notification] will activate.
Code Name Causes Possible Solutions
LT-3 SoftChargeBypassRelay MainteTime
The soft charge bypass relay is at 90% of its
performance life estimate.
Replace the control board or the drive. For information about
replacing the control board, contact Yaskawa or your nearest sales
representative.
Note:
When the performance life estimate is expired, the terminal set to H2-01 to H2-03 = 2F [MFDO Function Selection = Maintenance Notification] will activate.
Code Name Causes Possible Solutions
LT-4 IGBT Maintenance Time (50%)
The IGBT is at 50% of its performance life estimate. Check the load, carrier frequency, and output frequency.
Note:
When the performance life estimate is expired, the terminal set to H2-01 to H2-03 = 2F [MFDO Function Selection = Maintenance Notification] will activate.
Code Name Causes Possible Solutions
LWT Low Water In Tank
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
• 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.
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
NMS Setpoint Not Met
The feedback deviates from the setpoint at a level
more than Y1-15 [Maximum Setpoint Difference] for
the time set in Y1-16 [Not Maintaining Setpoint
Time].
• Examine for a blocked impeller, over cycling, or broken pipe.
• Set Y1-15 and Y1-16 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 error, it will respond as specified by the setting of Y1-17 [Not Maintaining Setpoint Sel].
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