Npaq® Hardware Manual
Maintenance
Table 4-2:
Troubleshooting
Symptom
Possible Cause and Solution
Operator Interface does
not start
l
Make sure that the power cord is connected and that the Npaq is turned
on before you start the Operator Interface
l
Check the Npaq Active status LED (Green LED on rear panel of Npaq)
and make sure it is not blinking.
l
Check FireWire Base Device # (S2, located on rear panel of Npaq). Make
sure that there are no conflicts with other devices on the FireWire
network.
Motor spins uncontrollably
Encoder (sine and cosine) signals are improperly connected. See
for motor connection and phasing information.
Brushless motor will not
spin
Motor phases A, B, and C connected incorrectly relative to Hall A, Hall B, and
Hall C inputs. See
for motor connection and phasing information.
Amplifier faults (“ENA”
LED de-energizes) when
motor decelerates.
Bus over voltage detected or incorrect parameter setting.
Amplifier Faults (Amplifier
“ENA” LED de-energizes).
1. RMS current exceeded - run at lower current.
2. Axis parameters not set correctly or attempting to exceed system
capability or setting.
3. Over temperature condition - Turn off and let amplifier cool down. Provide
better ventilation.
4. Motor Feedback problem (Encoder or Hall inputs).
Encoder Feedback Fault
1. Bad encoder feedback device.
2. Power supply voltage low at encoder.
106
Chapter 4
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