User manual
3U Servo Amplifier
Amplifier stops and displays a code
Amplifier Fault
If a 3U amplifier displays other digit than 0, please refer to the appropriate table from above for an
explanation of fault codes.
Amplifier is dark
If the amplifier status display, +5V, +12V, -12V, ENA1, and ENA2 are not illuminated, verify that DC
bus is connected to the 3U amplifier.
If the condition described above is present, and the 3U amp is used in a UMAC rack along with a power
supply, verify that AC line is connected to the power supply.
Motor does not move upon a command
Verify that PWM cables and motor leads are correctly connected to 3U amplifier.
Is motor properly phased? Is the BUS voltage ON?
Cannot phase a motor
Verify that PMAC is properly configured and reads the motor’s feedback. Power cycle the drive and the
controller.
Notes
If a shunt (regen) resistor is required, use the shunt terminals on the backplane.
If the 3U amplifier is not used in Delta Tau UMAC rack, it is a user’s
responsibility to assure that the proper cooling is provided for the IGBTs. Delta
Tau suggests a fan capable of at least 100 CFM placed as close to the heatsink as
possible.
If the bus connection to the 3U amp is not done via Delta Tau backplane, a de-coupling capacitor (about
120 µF) for + and – bus should be used.
Troubleshooting 41