19 Troubleshooting
110 YASKAWA TOEPC71061732E HV600 Drive Installation & Primary Operation
Code Name Causes Possible Solutions
NETSC NETSCAN Waiting for Master
The drive does not receive message from the master
in the time set in Y9-28 [NETSCAN Alarm Time].
• Increase Y9-28 to account for network latency.
• Make sure that there is a drive on the network with parameters
set to Y1-01 = 3 [Multiplex Mode = Memobus Network] and Y9-
27 = 0 [Network Recovery = Automatic].
• Examine the network connections and the settings of H5-01
[Drive Node Address] and Y9-25 [Highest Node Address] for all
drives on the network.
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.
OD Output Disconnect
The output circuit between the drive and the motor is
open, and the drive output current is less than 5% of
E2-01 [Motor Rated Current (FLA)].
• Close the disconnected output circuit between the drive and the
motor.
• If you do not use a motor disconnect, set Y4-42 = 0 [Disabled].
oH Heatsink Overheat
The ambient temperature is high and the heatsink
temperature is more than the L8-02 [Overheat Alarm
Level].
• Measure the ambient temperature.
• Increase the airflow around the drive.
• Install a cooling device (cooling fan or air conditioner) to
decrease the ambient temperature.
• Remove objects near the drive that are producing too much heat.
oH2 External Overheat (H1-XX=B)
An external device sent an oH2 alarm. 1. Find the external device that output the overheat alarm.
2. Remove the cause of the problem.
3. Clear the Overheat Alarm (oH2) [H1-xx = B] in MFDI
terminals S1 to S7.
oH3 Motor Overheat (PTC Input)
The thermistor wiring that detects motor temperature
is defective.
Correct wiring errors.
oL3 Overtorque 1
A fault occurred on the machine.
Example: The machine is locked.
Examine the machine and remove the cause of the fault.
oL4 Overtorque 2
A fault occurred on the machine.
Example: The machine is locked.
Examine the machine and remove the cause of the fault.
oS Overspeed
There is overshoot. Decrease C5-01 [ASR Proportional Gain 1] and increase C5-02
[ASR Integral Time 1].
ov DC Bus Overvoltage
The drive output cable or motor is shorted to ground
(the current short to ground is charging the main
circuit capacitor of the drive through the power
supply).
1. Examine the motor main circuit cable, terminals, and motor
terminal box, and then remove ground faults.
2. Re-energize the drive.
The power supply voltage is too high. Decrease the power supply voltage to align with the drive rated
voltage.
Electrical interference caused a drive malfunction. • Examine the control circuit lines, main circuit lines, and ground
wiring, and minimize the effects of noise.
• Find the source of the noise. If a magnetic contactor is the
source, use Surge Protective Device if necessary.
• Set L5-01 ≠ 0 [Number of Auto-Restart Attempts ≠ 0 times].
ovEr Too Many Parameters Changed
You tried to change more than 150 parameters. Make sure that parameters that do not have an effect on drive
operation are at their default settings.
Note:
• You can change 150 parameters maximum.
• If you change parameters that have dependencies, the drive
can detect ovEr when the number of changed parameters is
fewer than 150.
PASS Modbus Communication Test
The MEMOBUS/Modbus communications test is
complete.
The PASS display will turn off after communications test mode is
cleared.
PF Input Phase Loss
There is a phase loss in the drive input power. Correct errors with the wiring for main circuit drive input power.
Loose wiring in the input power terminals. Tighten the terminal screws to the correct tightening torque.
The drive input power voltage is changing too much. • Examine the input power for problems.
• Make the drive input power stable.
Unsatisfactory balance between voltage phases. • Examine the input power for problems.
• Make the drive input power stable.
• If the input power supply is good, examine the magnetic
contactor on the main circuit side for problems.
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