Yaskawa iQpump Micro - Manual (Page 171)

Digital Operator Display Fault Name
LOP
Loss of Prime
The pump has lost its prime.
Cause Possible Solution
The pump load, measured based on the
P1-18 setting (output current, kilowatts, or
power), has dropped below the level set in
P1-19, Prime Loss Level, for the time set in
P1-20, Loss of Prime Time, and the output
frequency has risen above P1-21, Prime
Loss Frequency. This is effective only
when P1-22 Loss of Prime Selection is set
to 0 (fault).
• Check for a dry well, air in the system, or no water in the system. Restart the pump using the preferred
priming method suggested by the pump manufacturer.
• Set the Loss of Prime fault characteristics in P1-18, P1-19, P1-20, and P1-21.
• Drive response to this condition is controlled by P1-21, Loss of Prime Selection.
• Auto-restart of this fault is controlled by L5-51, Loss of Prime Fault Retry Selection and P1-23, Loss of
Prime Maximum Restart Time after Fault
Digital Operator Display Fault Name
LWL
(LOH20)
Low Water Level
The “Low Water Level” digital input is active (H1-0o = 8F).
Cause Possible Solution
The Low Water Level switch is activated,
defective, or P1-30, Low Water Digital
Input Configuration, is programmed
incorrectly.
Raise the water level and/or adjust the Low Water Level switch.
Digital Operator Display Fault Name
MSL
Net Master Lost
(NSL)
Net Master Lost
The MEMOBUS master has been lost
Cause Possible Solution
Network Recovery is set to Fault MSL
(P9-27 = 3) and no message has been
received from the master within the time set
in P9-26.
• Increase the P9-26 setting to account for network latency.
• Verify that there is a drive on the network with parameter P1-01 set to 3 and P9-27 to 0.
• Check network connections and verify H5-01 and P9-25 settings for all drives on the network.
Digital Operator Display Fault Name
NMS
(NOTSP)
Not Maintaining Setpoint
The setpoint cannot be maintained and P1-17 is set to 0.
Cause Possible Solution
When the feedback deviates from the
setpoint at a level greater than P1-15, for a
time set in P1-16. This is effective only
when P1-17 is set to 0 (fault).
• Check for a blocked impeller, over cycling, or broken pipe.
• Set the Not Maintaining Setpoint fault characteristics in P1-16 and P1-17.
• Drive response to this condition is controlled by P1-17, Not Maintaining Setpoint Selection.
• Auto-restart of this fault is controlled by L5-50, Setpoint Not Met Retry.
Digital Operator Display Fault Name
nSE
Node Setup Error
A terminal assigned to the node setup function closed during run.
Cause Possible Solution
The node setup terminal closed during run.
Stop the drive when using the node setup function.
A Run command was issued while the node
setup function was active.
Digital Operator Display Fault Name
oC
Overcurrent
Drive sensors detected an output current greater than the specified overcurrent level.
Cause Possible Solution
The motor has been damaged due to
overheating or the motor insulation is
damaged
• Check the insulation resistance.
• Replace the motor.
5.2 Fault Detection
YASKAWA TOEP YAIQPM 03B YASKAWA AC Drive - iQpump Micro User Manual 171
5
Troubleshooting