YASKAWA FSDrive-MV1000 Instructions Manual page 127

Digital Operator Display
oL4
Cause
Parameter settings are not appropriate for the
load.
Fault on the machine side (e.g., machine is
locked up).
Digital Operator Display
oL5
Cause
Overtorque triggered mechanical weakening
detection level set to L6-08.
Digital Operator Display
OOV
Cause
Excessive rise of the output voltage
Digital Operator Display
oPr
Cause
External digital operator is not properly
connected to the drive.
Digital Operator Display
oS
Cause
Overshoot is occurring.
Inappropriate parameter settings
Digital Operator Display
PGo
Cause
PG cable is disconnected.
PG cable wiring is wrong.
PG has no power.
PG encoder brake is clamped shut.
Digital Operator Display
PGoH
Cause
PG cable is disconnected.
YASKAWA ELECTRIC EZZ010928 FSDrive-MV1000 Instructions
Overtorque Detection 2
The current has exceeded the value set for Torque Detection Level 2 (L6-05) for longer
than the allowable time (L6-06).
⇒Check the settings of parameters L6-05 and L6-06.
Check the status of the machine.
⇒Remove the cause of the fault.
Mechanical Weakening Detection 1
Overtorque occurred, matching the conditions specified in L6-08.
Check for the cause of mechanical weakening.
Output Overvoltage
The output voltage of the drive has exceeded the output overvoltage detection level in L8-
63 for longer than the time set to L8-64.
⇒Change the motor parameters to appropriate values.
Parameters: E1- , E2-
⇒Change the settings of L8-63 and L8-64 to appropriate values.
⇒Check the cables on the output side for disconnection or incorrect connection, and
correct if necessary.
Digital Operator Connection Fault
The external digital operator has been disconnected from the drive.
Note: An oPr fault will occur when all of the following conditions are true:
• Output is interrupted when the digital operator is disconnected (o2-06 = 1).
• The Run command is assigned to the operator (b1-02 = 0 or LOCAL has been selected).
Check the connection between the digital operator and the drive.
⇒Replace the cable if damaged.
⇒Turn off the drive input power and disconnect the digital operator. Next reconnect the
digital operator and turn the drive input power back on.
Overspeed (for Control Mode with PG)
The motor speed feedback exceeded the F1-08 setting (Overspeed Detection Level).
⇒Decrease the setting for C5-01 (ASR Proportional Gain 1) and increase the setting for
C5-02 (ASR Integral Time 1).
⇒Check the setting for the overspeed detection level and the overspeed detection time (F1-
08 and F1-09).
PG Disconnect (for Control Mode with PG)
No PG pulses are received for longer than the time set to F1-14.
⇒Reconnect the cable.
⇒Correct the wiring.
⇒Check the power line to the PG encoder.
⇒Ensure the motor brake releases properly.
PG Hardware Fault (detected when using a PG-X3 option card)
PG cable is not connected properly.
⇒Reconnect the cable.
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5.4 Fault Detection
5
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