This type of alarm occurs when the drive detects an excessive current or a short circuit on one of the
six IGBT output stages.
With this type of alarm, the reaction is always disabling, as appropriate control of the motor is
no longer possible.
The probable causes of this type of alarm are listed in the following table.
Cause Suggested action
Short circuit in the
motor
Check the motor insulation with a multimeter or other suitable tool.
Alternatively:
l unplug the power cable from the motor
l re-enable the axis
l
If the problem persists, the drive needs to be checked and/or replaced
Short circuit between
the motor cables
Disconnect the cable from the motor and from the drive, then check the cable
insulation with a multimeter or other suitable tool. Alternatively:
l
unplug the power cable from the motor side
l re-enable the axis
Wrong setting of the
current loop
Check the motor parameters stored in the drive configuration.
Damaged internal
drive components
Unplug the power cable from the drive side
Re-enable the axis
If the problem persists, the drive needs to be replaced
9.2.2 Alarm for VBUS Voltage Out of Tolerance
Fault Cause Action
DC_Link_Under Voltage Voltage lower than the
minimum threshold set
Sensing circuit fault Measure the voltage on
the DC bus and compare
with that measured by
the drive
DC_Link_Over Voltage Voltage higher than the
maximum threshold set
Brake resistor not
connected to the power
supply or faulty
Measure the ohm value
of the resistor and
replace it if necessary
In the case of controlled braking, the available kinetic energy is regenerated on the DC BUS and
is partly stored in the capacitors; the excess, if not dissipated by the braking resistor (RR
power supply) can cause a DC_Link_Overvoltage that can damage to the drives..
9.2.3 Drive or Motor Overtemperature
l
Excess_temperature_drive
l
Motor_temperature_warning
l
Motor_over_temperature
PN: L-MAM2-E-201
Moog Casella DM2020 Installation and Startup Guide
9.2.2 Alarm for VBUS Voltage Out of Tolerance
if the problem persists, both drive and cables need to be checked
l
l
l
l
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