YASKAWA HV600 Installation & Startup page 138

5.6 Minor Faults/Alarms
Code Name
LOW_SUCT Low Suction Detected
Code Name
LSP Low Suction Pressure
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
LT-1 Cooling Fan Maintenance 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
LT-2 Capacitor Maintenance 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
LT-3 SoftChargeBypassRelay MainteTime
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
LT-4 IGBT Maintenance Time (50%)
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
LWT Low Water In Tank
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
NMS Setpoint Not Met
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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Causes
The bypass detected a Low Suction condition.
Causes
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
Causes
The cooling fan is at 90% of its performance life
estimate.
Causes
The capacitors for the main circuit and control circuit
are at 90% of their performance life estimate.
Causes
The soft charge bypass relay is at 90% of its
performance life estimate.
Causes
The IGBT is at 50% of its performance life estimate.
Causes
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
Causes
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].
YASKAWA TOEPYAIH6B01A HV600 AC Drive Narrow Bypass Installation & Startup
Possible Solutions
• 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.
Possible Solutions
• 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.
Possible Solutions
1. Replace the cooling fan.
2. Set o4-03 = 0 [Fan Operation Time Setting = 0 h] to reset the
cooling fan operation time.
Possible Solutions
Replace the control board or the drive. For information about
replacing the control board, contact Yaskawa or your nearest sales
representative.
Possible Solutions
Replace the control board or the drive. For information about
replacing the control board, contact Yaskawa or your nearest sales
representative.
Possible Solutions
Check the load, carrier frequency, and output frequency.
Possible Solutions
• 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.
Possible Solutions
• Examine for a blocked impeller, over cycling, or broken pipe.
• Set Y1-15 and Y1-16 correctly.