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Chapter 4 - Diagnostics
Alarm & Fault Displays
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 VG5 malfunctions.
Inverter Alarms & Faults
When the VG5 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 Saftronics
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
UV1
Main circuit
DC Bus Undervolt
undervoltage (PUV)
UV2
Control circuit under-
CTL PS Undervolt
voltage (CUV)
UV3
MC fault
MC Answerback
UV
Momentary power loss
Under Voltage
OC
Overcurrent (OC)
Overcurrent
GF
Ground fault (GF)
Ground Fault
64
Name
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
Undervoltage in the control circuit dur-
ing running.
The pre-charge contactor opened dur-
ing 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.
Inverter output grounding current
exceeded 50% of inverter rated cur-
rent.
Description
·Check the power supply wir-
·Correct the line voltage
·Check the motor coil resis-
·Extend the accel/decel time.
·Check the motor insulation.
·Multi-meter check.
·Check that motor insulation
·Check that connection
VG5 Installation & Quick-Start Manual
Corrective Action
ing.
--
tance.
has not deteriorated.
between inverter and motor
is not damaged.
Class
A
A
A
B
A
A
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