Alarm And Fault Displays; Fault Classes - YASKAWA VS-616PS5 Series Quick Start Manual

6. 3 Alarms and Fault Displays

Fault Classes

A: MAJOR Fault
B: FAULT
C: ALARM (warning)
When the VS-616PS5 detects a major fault, the fault is displayed on the digital operator and activates a fault con-
tact output, after which the motor coasts to a stop. Check the causes listed by the fault code in the following tables
and take the corrective actions necessary.
To restart the inverter, remove any RUN commands present, and reset the inverter with the digital operator or an
input, if selected. Cycling the power will also reset the inverter. If the corrective actions suggested do not clear the
problem, contact your representative.
Alarms do not activate fault contact outputs. Once the cause of the alarm is removed, the inverter clears the alarm
status.
Fault Display
Main circuit
UV1
undervoltage (PUV)
DC Bus
Undervoltage
Control circuit under-
UV2
voltage (CUV)
CTL PS
Undervoltage
MC fault
UV3
MC Answerback
Momentary power loss
UV
Under Voltage
Overcurrent (OC)
OC
Overcurrent
VS-616PS5 Installation & Quick Start Manual
• Motor coasts to a stop.
• Operation Indicator lights.
• Fault Output (terminals 18 and 19) is activated
• Operation continues
• Operation indicator lights
• Multi-function output (if selected) activates
• Fault Output (terminals 18 and 19) is NOT activated
• Operation cannot be performed
• Operation Indicator lights
• No fault outputs
Name
Undervoltage in the DC main circuit dur-
ing running.
Detection level:
230V class: Approx. 190V or less
460V class: Approx. 380V or less
Undervoltage in the control circuit during
running.
The pre-charge contactor opened during
running.
• The main circuit DC voltage fell below
the PUV level.
• The control power source fell below
the CUV level.
• The pre-charge contactor opened.
The inverter output current exceeded
the OC level. ( ~ 200% Inverter rating)
Description Corrective Action
• Check the power supply wir-
ing.
• Correct the line voltage
−
• Check the motor coil resis-
tance.
• Extend the accel/decel time.
• Check the motor insulation.
• Multi-meter check.
Class
A
A
A
C
A
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