YASKAWA FSDrive-MV1000 Instructions Manual page 129

Digital Operator Display
UL5
Cause
Undertorque was detected and matched the
conditions for mechanical loss detection set to
L6-08.
Digital Operator Display
Uv1
Cause
There is phase loss in the drive input power.
There is loose wiring in the drive input power
terminals.
There is a problem with the voltage from the
drive input power.
The power has been interrupted.
Digital Operator Display
VUB
Cause
The motor has been damaged due to
overheating or the motor insulation is
damaged.
One of the motor cables has shorted out or
there is a grounding problem.
The output side cable wiring is wrong.
<1> When a fault occurred at the startup of the drive, CPF00 or CPF20 is displayed. When a fault occurred after the startup, CPF01 or
CPF21 is displayed.
<2> The number of connectors and options that are able to be installed can differ according to the option. Refer to the table below to connect
it properly.
Option Card
SI-N3, SI-P3, AI-A3, DI-A3
PG-B3, PG-X3
DO-A3, AO-A3
<3> When used for monitoring, AI-A3 and DI-A3 can be installed in any of CN5-A, B or C.
YASKAWA ELECTRIC EZZ010928 FSDrive-MV1000 Instructions
Mechanical Weakening Detection 2
The operation conditions matched the conditions set to L6-08.
Check the load side for any problems.
Undervoltage
One of the following conditions occurred while the drive was operating (during voltage
output):
• Voltage in the DC bus fell below the undervoltage detection level (L2-05)
• 2-kV class: Approx. 693 V
• 4-kV class: Approx. 1188 V
The main circuit drive input power is wired incorrectly.
⇒Correct the wiring.
Check if the terminals are loosened.
⇒Retighten the terminals to the tightening torques specified in this manual (refer to page
64).
Check the voltage.
⇒Correct the voltage to be within the range listed in drive input power specifications.
⇒If there is no problem with the power supply to the main circuit, check for problems with
the main circuit magnetic contactor.
⇒Correct the drive input power.
Voltage Unbalance
The sum of the detected output voltages of the three phases exceeded the detection level for
longer than the stipulated time.
Check the insulation resistance of the motor.
⇒Replace the motor.
Check the motor cable.
⇒Remove the short circuit and turn the power back on.
Check the resistance between the motor cables and the ground terminal
⇒Replace the cable.
⇒Correct the wiring.
Table 5.13 Option Card and Available Connector
Available Connector
CN5-A
<3>
CN5-B, C
CN5-A, B, C
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Available Number of Option Cards
5.4 Fault Detection
.
1
2
1
129
5