Maintenance 9. Troubleshooting
DU1 Internal temperature of the Controller is
higher than the allowed temperature.
Stop the Drive Unit 1 as soon as possible and
check whether the ambient temperature of the
controller is not high.
Check whether the filter is not clogged up.
DU1 Rotating speed of the controller fan is
below the allowed speed. (FAN1)
Check whether the filter of the Drive Unit 1 is
not clogged up. Replace the fan.
DU1 Rotating speed of the controller fan is
below the allowed speed. (FAN2)
Check whether the filter of the Drive Unit 1 is
not clogged up. Replace the fan.
DU2 3.3V input voltage for the board is
lower than the minimum allowed voltage.
If normal voltage is not generated by 3.3V of
Drive Unit 2 power supply alone, replace the
DU2 5V input voltage for the board is lower
than the minimum allowed voltage.
If normal voltage is not generated by 5V of
Drive Unit 2 power supply alone, replace the
DU2 24 V input voltage for the motor brake,
encoder and fan is lower than the specified
If normal voltage is not generated by 24V of
Drive Unit 2 power supply alone, replace the
DU2 Internal temperature of the Controller is
higher than the allowed temperature.
Stop the Drive Unit 2 as soon as possible and
check whether the ambient temperature of the
controller is not high.
Check whether the filter is not clogged up.
DU2 Rotating speed of the controller fan is
below the allowed speed. (FAN1)
Check whether the filter of the Drive Unit 2 is
not clogged up. Replace the fan.
DU2 Rotating speed of the controller fan is
below the allowed speed. (FAN2)
Check whether the filter of the Drive Unit 2 is
not clogged up. Replace the fan.
3.3V input voltage for the board is
lower than the minimum allowed voltage.
If normal voltage is not generated by 3.3V of
Drive Unit 3 power supply alone, replace the
5V input voltage for the board is lower
than the minimum allowed voltage.
If normal voltage is not generated by 5V of
Drive Unit 3 power supply alone, replace the
9043
DU3 24 V input voltage for the motor brake,
encoder and fan is lower than the specified
If normal voltage is not generated by 24V of
Drive Unit 3 power supply alone, replace the
9044
DU3 Internal temperature of the Controller is
higher than the allowed temperature.
Stop the Drive Unit 3 as soon as possible and
check whether the ambient temperature of the
controller is not high.
Check whether the filter is not clogged up.
Rotating speed of the controller fan is
below the allowed speed. (FAN1)
Check whether the filter of the Drive Unit 3 is
not clogged up. Replace the fan.
9046
DU3
Rotating speed of the controller fan is
below the allowed speed. (FAN2)
Check whether the filter of the Drive Unit 3 is
not clogged up. Replace the fan.
9100
Initialization failure.
Failed to allocate memory.
Message queue has become full.
9102
Initialization failure.
Failed to initialize Modbus.
Check whether the selected port is installed.
(When TCP is selected)
Check whether the selected port number is
9103
Initialization failure.
Failed to initialize the user output.
If the manipulator is specified, check whether
the specified manipulator is registered.
Unexecutable command is specified
Check the condition expression.
RC90 (EPSON RC+ 7.0) Rev.4
191