Yaskawa VS-616G5 Series Revision F Quick-Start User Manual
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VS-616G5 Installation & Quick-Start Manual
4.2
ALARM & FAULT DISPLAYS
This section describes the alarm and fault displays, explanations for fault conditions, and corrective
actions to be taken if the VS-616G5 malfunctions.
Inverter Alarms & Faults
When the VS-616G5 detects a fault, the fault is displayed on the digital operator and activates a fault
contact output, after which the motor coasts to a stop. Check the causes listed in the table below and
take the corresponding corrective actions. To restart the inverter, remove any run command and turn
ON the reset input signal or depress the RESET key on the digital operator, or cycle power to reset the
stop status. If taking the corrective actions described does not solve the problem, contact your Yaskawa
representative immediately.
Unlike faults, alarms do not activate fault contact outputs. After the cause of the alarm is corrected, the
inverter returns to its former operation status automatically.
Fault Diagnosis and Corrective Actions
Fault Display
Name
Description
Corrective Action
Class
UV1
DC Bus Undervolt
Main circuit
undervoltage (PUV)
Undervoltage in the DC main circuit
during running.
Detection level
230 V class: Approx. 190 V or less
460 V class: Approx. 380 V or less
575 V class: Approx. 546 V or less
·Check the power supply wir-
ing.
·Correct the line voltage
A
UV2
CTL PS Undervolt
Control circuit under-
voltage (CUV)
Undervoltage in the control circuit dur-
ing running.
A
UV3
MC Answerback
MC fault
The pre-charge contactor opened dur-
ing running.
A
UV
Under Voltage
Momentary power loss
·The main circuit DC voltage fell below
the PUV level.
·The control power source fell below
the CUV level.
·The pre-charge contactor opened.
--
B
OC
Overcurrent
Overcurrent (OC)
The inverter output current exceeded
the OC level.
·Check the motor coil resis-
tance.
·Extend the accel/decel time.
·Check the motor insulation.
·Multi-meter check.
A
GF
Ground Fault
Ground fault (GF)
Inverter output grounding current
exceeded 50% of inverter rated cur-
rent.
·Check that motor insulation
has not deteriorated.
·Check that connection
between inverter and motor
is not damaged.
A
Chapter 4 - Diagnostics
Alarm & Fault Displays